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Understanding Venezuela’s ‘Double’ Earthquake: Key Facts You Need to Know About the Series of Quakes

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A second powerful earthquake shook Venezuela on Wednesday, striking just 39 seconds after the first quake subsided. The two earthquakes registered magnitudes of 7.1 and 7.5, causing significant concern among residents and seismologists alike.

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According to the U.S. Geological Survey, these two earthquakes are classified as a doublet array, which refers to the occurrence of two earthquakes with similar magnitudes that strike the same geographic area almost simultaneously.

Harold Tobin, director of the Pacific Northwest Seismic Network and a professor at the University of Washington, stated, “The first seismic wave had not yet dissipated when the second quake occurred.”

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Severely damaged apartment complex in Catia la Mar, Venezuela, observed on Thursday.Juan Barreto/AFP via Getty Images

It’s not unusual for two earthquakes to occur in rapid succession; however, this particular sequence of tremors led to extensive damage, with reports indicating at least 188 fatalities, over 1,520 injuries, and more than 150 individuals still unaccounted for.

According to Tobin, “The first quake likely compromised the structural integrity of several buildings. If they survived the initial earthquake, the subsequent quake could lead to their collapse.”

The Richter scale is logarithmic, indicating that a 7.5 magnitude earthquake releases approximately three times the energy of a 7.1 magnitude earthquake. Each integer on the scale represents a tenfold increase in amplitude.

This doublet earthquake pattern occurred in a complex fault system near San Felipe, Venezuela. The intricacies of this zone will likely prolong the researchers’ efforts to fully comprehend which faults were involved.

Maria Beatriz Magnani, a seismology professor at Southern Methodist University who studied Venezuela’s fault lines in the early 2000s, noted that the rupture transpired along the boundary of the South American and Caribbean tectonic plates, which are moving laterally past each other. The USGS estimates this eastward movement occurs at roughly 20 millimeters (approximately three-quarters of an inch) annually, compounded by compression forces as the plates interact.

Early assessments suggest that both earthquakes were of the strike-slip variety, characterized by one plate shifting past another. However, further data is still needed to clarify the mechanisms of these seismic events.

Magnani remarked, “It will take time to fully decipher the history of this fault. This is an exceedingly intricate plate boundary.”

Rescue teams searching through the debris of a collapsed house in Catia la Mar, Venezuela, on Thursday.Federico Parra/AFP via Getty Images

Tobin indicated that the first earthquake likely instigated the second.

He stated, “This region is characterized by a complex arrangement of faults and fractures rather than a singular fault line, adding to the complexity of this earthquake sequence.”

A 1999 study in the Bulletin of Atmospheric Sciences reviewed 70 earthquakes over a year, finding that 22% of earthquakes greater than magnitude 7.5 were part of doublets. Venezuela had also experienced doublet earthquakes of magnitudes 6.2 and 6.3 in 2025, but they occurred southwest of Wednesday’s quake, resulting in one death and over 110 injuries according to the USGS.

In 2023, a pair of earthquakes measuring 7.8 and 7.5 struck southern Turkey and Syria, leading to over 3,000 fatalities.

In North America, two magnitude 6.2 earthquakes near the British Columbia-Alaska border were recorded within a two-hour window in May 2017, while a double earthquake in Klamath Falls, Oregon, featured a magnitude 5.9 tremor followed by a magnitude 6.0 event two hours later in September 1993.

Tobin noted that experts are still evaluating whether the events on Wednesday should be classified as a doublet, although the USGS currently characterizes them as such.

The classification remains a topic of debate among seismologists, creating discussions about whether this represents two separate earthquakes or one event with multiple stages.

A woman walking past an earthquake-damaged building in La Guaira, Venezuela, on June 25, 2026.Pedro Mattei/AP

Venezuela has recorded five earthquakes of magnitude 7.0 or greater since 1900, but none occurred along the fault line where Wednesday’s events transpired. This indicates that stress may have been building in this region for over 200 years.

Tobin added that no earthquake measuring 7.0 or higher has occurred along the fault since around 1812.

According to Magnani, the recent twin earthquakes will offer invaluable data for researchers aimed at uncovering fault structures concealed beneath the Earth’s surface.

“This event provides new insights into how the fault behaves and aids in comprehending the complexities of this region,” Magnani concluded. “Each earthquake and aftershock enriches our understanding of this intricate geological area.”

Source: www.nbcnews.com

How the 2011 Earthquake Shifted Japan Eastward: A Geological Perspective

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Kesennuma, Japan, post-2011 earthquake

Kesennuma Fishing Port: Aftermath of the 2011 Tohoku Earthquake

Carolyn Cole/Los Angeles Times via Getty Images

Just 15 minutes after the powerful magnitude 9 Tohoku earthquake struck Japan on March 11, 2011, nearly all of the country shifted eastward by approximately half a centimeter. This seismic shift resulted from incredibly strong seismic waves that traveled 5,800 kilometers deep into the Earth and then rebounded to the surface.

While a 5-millimeter shift may seem trivial amid the devastation, it is crucial to understand that it occurred over a staggering distance of 3,000 kilometers. This distance is nearly seven times the length of the main rupture line of the earthquake, marking it as the largest recorded slip of its kind.

Notably, the unique timing and pattern of this event are significant. According to Park Sun Young of the University of Chicago, “No typical earthquake dynamics occurred at that precise moment, and a similar 5-millimeter eastward shift occurred almost simultaneously throughout most of Japan.”

The alterations were remarkable, extending not just from north to south but throughout the entire nation and even affecting the surrounding oceans.


“It’s not merely a singular ‘edge’ moving,” Park explained. “The eastward shift is widespread across Japan, particularly where GPS stations are present. With a similarly high density of sensors on the ocean floor, we could ascertain more precisely how widespread this offshore movement is. However, on land, this shift is observable almost universally across Japan.”

By analyzing extensive GPS and seismic data collected during the disaster, Park and his colleagues investigated how such massive shifts were instigated and why the rupture transpired 15 minutes post the main shock.

Earthquakes typically generate waves that penetrate deep into the Earth and reflect off its core; however, these waves usually lose strength by the time they resurface. In the Tohoku event, the main shock was so powerful that, despite the weakening of the original wave, it remained robust enough to induce tremors nationwide, as four adjacent tectonic plates moved synchronously.

“We surmise that the intense shaking from the initial Tohoku earthquake weakened the plate boundaries, rendering them more prone to movement when these nuclear reflection waves reached them,” states Professor Park.

This incident highlights a newly identified post-earthquake rupture mechanism, suggesting a need for awareness of potential seismic hazards from waves that travel deeper and over much larger distances following significant earthquakes, potentially triggering additional seismic events.

Further research is essential to understand the implications of this phenomenon in other global regions susceptible to similar seismic vulnerabilities, as noted by Robin Lee from the University of Canterbury, New Zealand.

“This illustrates that major earthquakes can instigate widespread delayed faulting within minutes and across a significantly larger area than previously expected,” Lee stated.

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Source: www.newscientist.com

How Earth’s Core Waves Transformed Japan Post-2011 Earthquake

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Kesennuma fishing port after the 2011 Tohoku earthquake

Kesennuma Fishing Port: The Aftermath of the 2011 Tohoku Pacific Coast Earthquake

Image Credit: Carolyn Cole/Los Angeles Times via Getty Images

<p>On March 11, 2011, just 15 minutes after Japan experienced the powerful magnitude-9 Tohoku earthquake, most of the country shifted eastward by approximately half a centimeter. This significant geographical change was driven by formidable seismic waves that traveled 5,800 kilometers deep to the Earth's core before bouncing back to the surface.</p>

<p>While a shift of five millimeters may appear minor against the catastrophic backdrop of the earthquake—which caused severe local land movements, resulting in the meltdown of three reactors at the Fukushima Daiichi nuclear power plant and a devastating 40-meter tsunami—it highlights a complex geological phenomenon.</p>

<p>This remarkable movement spanned 3,000 kilometers, nearly seven times longer than the earthquake's primary rupture line and surpassing any previously recorded land displacement.</p>

<p>Park Sun Young from the University of Chicago notes that this event is unique due to its timing and pattern: "No normal earthquake took place at that moment. This widespread 5-millimeter eastward displacement occurred almost simultaneously across most of Japan."</p>

<p>The changes were not only vast but also influenced the oceans, showcasing the extensive impact of the earthquake across the entire nation.</p>

<p>"It’s not just a limited 'edge' moving," Park explained. "The eastward shift is widespread across Japan, particularly where GPS stations are located. If we had greater density of instruments on the ocean floor, we could better assess this offshore movement, but on land, these changes are evident throughout Japan."</p>

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<p>By meticulously analyzing a wealth of GPS and seismic data obtained during this disaster, Park and colleagues uncovered the mechanisms behind such enormous movements and the reasons for the rupture occurring 15 minutes post-main shock.</p>

<p>Typically, earthquakes generate waves that penetrate the Earth's interior and rebound off the core, but these waves weaken significantly before reaching the surface. In the case of the Tohoku earthquake, the shock was so powerful that the waves remained strong enough upon returning to the surface, causing widespread shaking as four adjoining tectonic plates moved synchronously.</p>

<p>"We believe the intense shaking from the initial Tohoku earthquake compromised the stability of plate boundaries, rendering them more vulnerable to movement when reflection waves arrive," Professor Park stated.</p>

<p>This event suggests a previously unrecognized mechanism for post-earthquake rupture, indicating a need for awareness regarding potential seismic hazards triggered by waves traveling deeper following large earthquakes across extended distances—possibly leading to additional earthquakes.</p>

<p>Further research is crucial for comprehending how such phenomena affect other locations globally with similar geological traits, according to Robin Lee of the University of Canterbury, New Zealand.</p>

<p>("This demonstrates that significant earthquakes can initiate widespread delayed faulting within minutes and across much larger areas than anticipated," Lee pointed out.)</p>

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Source: www.newscientist.com

Experts Warn: California Faces Historic Risk of Major Earthquake

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Scientists are raising alarms that California may soon experience an earthquake similar to a recent quake. According to a new study, the seismic pressures on California’s two major fault lines are currently at their highest level in the past 1,000 years.

Published in Geophysical Research Journal, this new paper emphasizes the unpredictability of earthquake occurrences. However, it reveals that the Southern San Andreas and San Jacinto faults are under unprecedented stress, a condition termed “critical load.”

The last major earthquake of similar magnitude in California was the devastating 7.9 magnitude San Francisco earthquake on April 18, 1906, which claimed nearly 3,000 lives and brought widespread destruction to the Bay Area.

This catastrophic event released a significant amount of energy, affecting the northern segment of the San Andreas fault, while the southern fault systems examined in this study remained unaffected.

Since earthquakes in one section of the fault network do not relieve pressure in others, researchers indicate that strain has been building in the southern segments for decades, if not centuries.

Key Findings from the Research

Geologists, led by Lillian Burkhardt from the University of Hawaii at Manoa, utilized computer simulations to model significant seismic activities over the past millennium. Their findings indicate that California is experiencing its highest stress levels, thereby increasing the chances of an earthquake.

The model highlights a critical junction, or “earthquake gate,” located at Cajon Pass near San Bernardino, just northeast of Los Angeles. Burkhardt’s team notes that this junction could determine whether a rupture remains confined to one fault or propagates across multiple faults.

According to the model, the “gate” opens based on the matching stress levels of the two faults, both of which are currently under considerable pressure. A rupture that extends across both faults would be far more destructive than one occurring on a single fault, posing significant risks to Los Angeles, San Bernardino, Riverside, and the Coachella Valley, among the most densely populated areas in the United States.

Cajon Pass is a junction between California’s San Bernardino Mountains (above) and San Gabriel Mountains – Credit: Getty

Modern building codes have strengthened structures to withstand significantly more shaking compared to those built in 1906; however, a failure at a critical joint may still lead to catastrophic outcomes.

Expert Opinions

Bill McGuire, Emeritus Professor of Geophysics and Climate Hazards at University College London, who was not involved in this research, stated in an interview with BBC Science Focus, “Significant earthquakes are possible in both northern California (San Francisco and the Bay Area) and southern California (Los Angeles).” He highlights the importance of these new insights into earthquake risks.

McGuire further noted, “The concept that junctions like Cajon Pass function as ‘earthquake gates’ influencing whether one or multiple faults rupture is significant and has vital implications for future earthquake risk assessments.” He emphasized that the current stress levels on these faults being at historic highs is crucial for predicting when the next major event may occur in the Los Angeles region.

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Source: www.sciencefocus.com

How the Largest Earthquake in History Exceeded the Richter Scale: An In-Depth Analysis

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Regarding the Richter Scale, it was innovatively developed by seismologist Dr. Charles Richter in 1935 to create a standardized and objective number for quantifying the strength of earthquakes.

Before this advancement, earthquakes were merely classified as “violent” or “strong,” complicating global comparisons of seismic events.

The Richter Scale quantifies seismic activity based on the maximum amplitude of the seismogram waveform recorded by a seismometer—a device often dramatized in disaster films.










Significantly, the Richter Scale operates logarithmically. Thus, escalating from a magnitude 4 earthquake (which can cause books to tumble off shelves) to a magnitude 5 (which may damage poorly constructed buildings) indicates a tenfold increase in seismometer readings and approximately 32 times more energy released.

However, the traditional Richter Scale is optimized for a specific type of seismometer, which is now obsolete. Its limitations become evident when measuring large or distant earthquakes.

Consequently, earthquakes exceeding a magnitude of 7 on the Richter Scale fail to show proportional measurements relative to the actual energy released, thereby underestimating the potential damage to buildings and infrastructure.

Every increment on the Richter Scale signifies about 32 times more energy release. For instance, a magnitude 6 earthquake packs roughly 1,000 times more force than a magnitude 4. (Image credit: Getty Images)

In 1979, Professor Hiroo Kanamori and Dr. Thomas C. Hanks introduced an alternative known as the Moment Magnitude Scale. This method measures the strength of slow vibrations with periods spanning from 30 seconds to several minutes.

While these longer frequencies carry less energy, they penetrate deeper into the Earth’s crust and provide a more equitable distribution of energy measurements relative to the earthquake’s magnitude.

As a result, the Moment Magnitude Scale offers a more reliable framework for predicting earthquake energy using equipment located far from the epicenter.

Since the early 2000s, key seismological institutions have transitioned to employing the Moment Magnitude Scale.

Interestingly, seismologists occasionally still use the Richter Scale for events of magnitude less than 1, as this scale is less effective for measuring very minor earthquakes.

This article, written by Britt Gill of Peterborough, addresses the question: “What is the leading method for measuring earthquakes?”

For inquiries, feel free to email us at: questions@sciencefocus.com or connect with us on Facebook, Twitter, or Instagram. Don’t forget to include your name and location!

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Source: www.sciencefocus.com

Scientists Aim to Simulate T. Rex Moon Earthquake for Groundbreaking Research

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Innovative advancements in seismic technology are paving the way for artificial earthquakes, which could revolutionize mining discovery on both Earth and the Moon, as revealed by a pioneering German startup, Imensus. This breakthrough could play a crucial role in achieving lunar mining goals, although adapting it for the Moon poses significant challenges.

Inspired by the thundering footsteps of a tyrannosaurus rex, IMENSUS engineers have developed a cutting-edge rover prototype designed to send vibrations into the ground, effectively mapping underground resources.

“You know how dinosaurs move in Jurassic Park and shake the ground? That’s what we are,” stated David Frey, head of prototyping, during an interview with BBC Science Focus. “We are shaking the ground.”







Imensus is currently designing a model intended for Earth, enabling mining companies to locate valuable materials such as copper and gold with precision.

As seismic waves slow down when passing through dense rocks enriched with valuable minerals, geologists can effectively explore below the Earth’s surface. Surface sensors can identify wave speeds, revealing hidden resources underground.

Speaking at the AI Everything Conference in Egypt, Frey highlighted the broader potential applications of this technology beyond Earth. “The entire space industry aims to establish a presence on the Moon,” he stated. “Mining resources is essential for creating sustainable habitats.”

Frey emphasized the importance of investigating the subsoil before beginning any mining operations on Earth. “Why should we treat the Moon differently? This approach is not widely considered,” he noted.

Though lunar exploration typically relies on natural seismic activity caused by temperature fluctuations creating surface cracks, Frey proposed a revolutionary method that could generate artificial “moonquakes” on demand, providing precise measurement and control.

Unlocking Lunar Treasures

The Moon’s south pole has gained significant attention due to its potential for mining. While valuable minerals like copper and gold may be scarce, ice deposits in polar regions could be crucial resources for future missions. Additionally, lunar regolith—the loose soil on the Moon’s surface—will be vital for developing space infrastructures.

“To establish a long-term presence on the Moon, we must access existing resources,” said Lunar Seismologist Dr. Nicholas Schumer in an interview with BBC Science Focus. “Technological advancements that enable resource utilization could significantly enhance human habitats and foster a burgeoning space economy.”

Schumer, an associate professor at the University of Maryland and a scientist for NASA’s Mars Insight mission, emphasized that the seismic techniques employed by IMENSUS are effective for locating subsurface structures within the top 1 km (0.6 miles) of soil.

“They may help predict changes in the regolith’s structure by identifying features like lava tubes, buried ice, or alterations in sublunar geology,” he added.

The IMENSUS sensor captures seismic waves generated by vibrations from the rover, aiding in the exploration of mining sites on Earth – Photo courtesy of IMENSUS

This innovative approach ensures thorough site assessments, preventing financial losses due to unsuitable mining locations, as Frey pointed out: “In space engineering, such considerations are often overlooked. There’s a risk of encountering unanticipated geological features.”

Frey further noted, “Understanding subsoil layers through spacecraft measurements is vital for comprehending the Moon’s structure.”

Securing the Moon’s Future

However, Schumer warns that the Moon presents a “very hostile environment,” characterized by extreme temperatures, intense solar radiation, and abrasive regolith capable of damaging machinery.

“While it’s encouraging to see forward-thinking approaches to lunar challenges, I must stress that if equipment isn’t specially designed for these conditions, it’s likely to fail,” he cautioned.

Despite the nascent stage of lunar seismic exploration technology, Schumer agrees that “future missions will undeniably require effective seismic exploration systems.”

The terrestrial pilot phase for IMENSUS is set to commence in 2027. Whether this lunar-focused technology will be integrated into future space missions will largely depend on the progression of programs like NASA’s Artemis.

Frey envisions possibilities extending even to Mars and asteroid mining projects in the future, should space exploration ambitions shift in that direction.

Ultimately, one fact remains clear: if humanity aims to return to the Moon—or venture to Mars—we must understand what lies beneath the lunar surface.

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Source: www.sciencefocus.com

Using Lasers, Fiber Optics, and Subtle Vibrations to Develop Earthquake Warning Systems

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When the Mendocino earthquake erupted off the California coast in 2024, it shook structures from their very foundations, triggered a 3-inch tsunami, and sparked intriguing scientific investigations in the server room of a nearby police station.

More than two years prior to the quake, scientists had installed a device known as the “Dispersed Acoustic Sensing Interrogation Room” at the Alcata Police Station located near the coast. This device utilizes a laser directed through a fiber optic cable that provides internet connectivity to the station, detecting how the laser light bends as it returns.

Recently, researchers revealed in a study published in the Journal Science that data collected from fiber optic cables can effectively be used to “image” the Mendocino earthquake.

This research demonstrates how scientists can convert telecommunication cables into seismometers, providing detailed earthquake data at the speed of light. Experts noted that this rapidly advancing technology has the potential to enhance early earthquake warning systems, extending the time available for individuals to take safety measures, and could be critical for predicting major earthquakes in the future.

James Atterholt, a research geophysicist for the US Geological Survey and lead author of the study, stated, “This is the first study to image the seismic rupture process from such a significant earthquake. It suggests that early earthquake warning alerts could be improved using telecom fibers.”

The study proposes equipping seismometers with devices capable of gathering sparse data from the extensive network of telecommunications cables utilized by companies such as Google, Amazon, and AT&T, making monitoring submarine earthquakes—often costly—more affordable.

Emily Brozky, a professor of geoscience at the University of California, Santa Cruz, asserted that “early earthquake warnings could be dramatically improved tomorrow” if scientists can establish widespread access to existing communication networks.

“There are no technical barriers to overcome, and that’s precisely what Atterholt’s research emphasizes,” Brozky mentioned in an interview.

In the long term, leveraging this technology through fiber optic cables could enable researchers to explore the possibility of forecasting some of the most devastating earthquakes in advance.

Scientists have observed intriguing patterns in underwater subduction zones prior to significant earthquakes, including Chile’s magnitude 8.1 quake in 2014 and the 2011 Tohoku earthquake and tsunami in Japan.

Both of these major earthquakes were preceded by what are known as “slow slip” events that gradually release energy over weeks or months without causing noticeable shaking.

The scientific community is still uncertain about what this pattern signifies, as high-magnitude earthquakes (8.0 or greater) are rare and seldom monitored in detail.

Effective monitoring of seismic activity using telecommunications networks could enable scientists to accurately document these events and assess whether discernible patterns exist that could help predict future disasters.

Brodsky remarked, “What we want to determine is whether the fault will slip slowly before it gives way entirely. We keep observing these signals from afar, but what we need is an up-close and personal instrument to navigate the obstacles.”

While Brodsky emphasized that it’s still unclear whether earthquakes in these extensive subduction zones can be predicted, she noted that the topic is a major source of scientific discussion, with the new fiber optic technology potentially aiding in resolving this issue.

For nearly 10 years, researchers have been investigating earthquake monitoring through optical fiber cables. Brodsky stated that the study highlights the need for collaboration among the federal government, scientific community, and telecommunications providers to negotiate access.

“There are valid concerns; they worry about people installing instruments on their highly valuable assets and about the security of cables and privacy,” Brozky explained regarding telecom companies. “However, it is evident that acquiring this data also serves the public’s safety interests, which makes it a regulatory issue that needs to be addressed.”

Atterholt clarified that fiber optic sensing technology is not intended to replace traditional seismometers, but rather to complement existing data and is more cost-effective than placing seismometers on the seabed. Generally, using cables for earthquake monitoring does not interfere with their primary function of data transmission.

Jiaxuan Li, an assistant professor of geophysics and seismology at the University of Houston, noted he was not involved in the study but mentioned that there are still technical challenges to the implementation of distributed acoustic sensing (DAS) technology, which currently functions over distances of approximately 90 miles.

Li also pointed out that similar methods are being employed in Iceland to monitor magma movements in volcanoes.

“We utilized DAS to facilitate early warnings for volcanic eruptions,” Li explained. “The Icelandic Meteorological Office is now using this technology for issuing early alerts.”

Additionally, the technique indicated that the Mendocino tremors were rare “supershear” earthquakes, which occur when fault fractures advance quicker than seismic waves can travel. Atterholt likened it to a fighter jet exceeding the speed of sound.

New research has serendipitously uncovered patterns associated with Mendocino, providing fresh insights into this phenomenon.

“We still have not fully grasped why some earthquakes become supershear while others do not,” Atterholt reflected. “This could potentially alter the danger level of an earthquake, but the correlation remains unclear.”

Source: www.nbcnews.com

Kamchatka Earthquake Response Demonstrates Enhanced Tsunami Warning System

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The coastline of Shiogama, Japan, where a tsunami warning was issued following a significant earthquake

Asahi Shimbun via Getty Images

On July 29, a strong earthquake struck near Russia’s Kamchatka Peninsula, prompting a quick tsunami warning that allowed millions to evacuate safely. Although no unexpected waves materialized, the swift response demonstrates the progress made in tsunami science since the devastating tsunamis in 2004 and 2011, which cost tens of thousands of lives.

“This is an excellent accomplishment built on lessons learned from previous incidents,” said Ravindra Jayaratne, a researcher at the University of East London, UK.

The efficiency of the warning system can be attributed to an enhanced network of tsunami detection sensors. This includes seismometers that detect earthquake tremors and a series of buoys managed by the US National Oceanic and Atmospheric Administration, which assess wave heights and relay crucial information to satellites. Improved modeling techniques enable researchers at the Tsunami Warning Office to swiftly predict and disseminate alerts about wave impact locations and times.

On the day of the event, tsunami offices across the Pacific region were able to issue alerts almost immediately after the 8.8 magnitude earthquake was detected—recorded as the strongest ever. In Japan, approximately 2 million individuals evacuated from coastal regions, with others doing the same in Hawaii and even in Chile, located just south of the US west coast.

“The reaction was prompt and effective,” noted David Tappin from the British Geological Survey. He added, however, that despite the earthquake’s intensity, it resulted in minimal wave activity and flooding, highlighting the need for improved predictive capabilities regarding flood events based on early detection of tremors and wave conditions.

Jayaratne also pointed out that regions prone to tsunamis, such as Bangladesh and Sri Lanka, lack a robust warning system and adequate public awareness of potential risks. “History shows that advanced detection technologies are only useful when accompanied by effective public communication and comprehensive evacuation strategies,” he said. “Coastal communities must conduct drills regularly to enhance public awareness and ensure warnings reach those in need through various channels.”

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Source: www.newscientist.com

Tsunami Advisory Issued for Alaska Following 7.3 Magnitude Earthquake off the Aleutian Islands

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Alaska’s coastal regions were on alert for a tsunami Wednesday following a 7.3 magnitude earthquake that hit the Ariuya Islands, according to officials.

The earthquake occurred at 12:38 PM local time (4:38 PM ET), with its epicenter located 55 miles south of Sandpoint, a community on Popf Island. The quake was recorded at a depth of 12 miles.

Tsunami data was not immediately available, and effects for Kodiak Island were not anticipated until 2:40 PM local time (6:40 PM ET).

Although no large-scale flooding is expected, the Tsunami Warning Center stated that dangerous currents and waves could pose risks to those in close proximity.

The initial tsunami warning has since been adjusted to a tsunami advisory.

These advisories span various coastlines, from Unimak Pass in the Aleutians to the entrance of Kennedy, located 40 miles south of Homer.

Emergency personnel in Kodiak, a city of around 5,500 that lies about 250 miles south of Anchorage, announced that shelters would be opened and sirens sounded prior to the warning being downgraded.

“The sirens are sounding, and remain vigilant if you’re near the coast,” Kodiak Island Emergency Management advised on social media.

Emergency officials reported no threat to Anchorage, Alaska’s largest city, following the earthquake.

Debi Schmidt, the city manager of Sand Point, discussed the earthquake with NBC affiliate Ktuu, describing it as the strongest quake she had ever experienced.

“I was at home for lunch when the house began to shake; things were falling, and the cupboard door swung open,” she recounted to the station. “Fortunately, there was no damage.”

Source: www.nbcnews.com

Rescuers in Landslide Efforts to Utilize Swift Earthquake Data Analysis

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Community members investigating a landslide in Yangbari, Papua New Guinea, in 2024

Xinhua Newsletter/Aramie

In the event of a landslide, pinpointing the location can be crucial for rescue teams. Recent advancements in earthquake data analysis have made it possible to identify the source of such disasters within just a few kilometers in a matter of seconds.

Current methods can generally limit the area of interest to tens of kilometers, as noted by Stefania Ursica from the Helmholtz Geoscience Centre in Germany. This limitation can result in significant delays if rescuers are directed to an incorrect site. “The time lost is critical,” Ursica stated during a press briefing at the European Geoscience Union Conference in Vienna last week.

Numerous countries maintain seismic monitoring networks to track earthquakes and volcanic activity. This data can also aid in detecting landslides, especially as the risks associated with climate change intensify. However, analyzing data from landslides is considerably more complex than that from earthquakes, according to Ursica.

Her team’s innovative approach involves two key components. First, they assess five distinct facets of the seismic waveform and filter out noise when an event occurs.

This information is processed by numerous mathematical agents that seek the origin of the initial rock-like event that leads to a landslide. They accomplish this by estimating which waveforms would have been generated at various possible locations and comparing those estimations with the data captured. If the waveforms do not align, they will explore other options.

Each agent “travels” following patterns inspired by animal behavior, such as the spiral of falcons or the migration paths of elephants, until they converge back to the most plausible site of the event. This whole procedure takes approximately 10 seconds, providing far greater accuracy than previous methods. “It’s a few digits of improvement,” Ursica adds.

Aside from enhancing rescue operations, this new technique will assist researchers in locating events in remote regions where satellite data may be limited or unavailable.

The team plans to release their findings and make the underlying code accessible to the public.

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Source: www.newscientist.com

When to Alert the Public: Seismologists Investigate Forewarnings of Impending “Major Earthquake”

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New studies conducted by USGS geophysicist Danny Brothers reveal that the Cascadia subduction zone, stretching along the US west coast from northern California to northern Vancouver Island, may have seen around 30 large earthquakes over the past 14,200 years. On average, a large earthquake could occur in that area approximately every 450 to 500 years.

Despite this history, the Cascadia Volcano has remained dormant for years, as many scientists believe the volcano is mainly “frozen” and under immense pressure. Should the volcano erupt, it could cause a significant shift in the ocean floor, leading to potential tsunamis heading towards the shore.

Washington State Emergency Management Director Robert Ezell has warned that this event could be the most catastrophic natural disaster in the country’s history.

Seismologists are now focused on predicting these potential cataclysms, with research suggesting that faults like Cascadia and Nankai may give off warning signs, such as minor foreshocks or subtle tremors only detectable by specialized sensors (known as slow-slip events).

In a worst-case scenario proposed by Tobin, if the Cascadia Fault were to release such vibrations suddenly, the consequences could be devastating.

A major earthquake in the Cascade Range could leave over 100,000 people injured, lasting for five minutes and generating tsunamis along the coast for up to 10 hours. Liquefaction could occur in inland hills, destroying roads and bridges, with around 620,000 buildings, including hospitals and schools, facing severe damage or destruction.

Ezell emphasized that the state is not adequately prepared for such an event, warning residents to be self-sufficient for at least two weeks following a disaster.

The maps of the Pacific Ring of Fire, where tectonic plates converge to create subduction zones and volcanoes, particularly concern Ezell.

“Over the past few decades, we’ve witnessed major ruptures in all subduction zones’ faults except for Cascadia,” Ezell noted.

Source: www.nbcnews.com

Japan’s First “Major Earthquake Warning” and Its Significance

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summary

  • Japan’s Meteorological Agency issued its first-ever “major earthquake warning” on Thursday.
  • The warning came after a magnitude 7.1 earthquake struck off the coast of the southern part of the country.
  • This raises the risk of an even bigger earthquake in the Nankai Trough, an undersea subduction zone that scientists believe could produce a quake of up to magnitude 9.1.

After a magnitude 7.1 earthquake struck Japan’s southern islands on Thursday, the country’s Meteorological Agency issued an ominous warning: More powerful quakes are possible, with the risk especially high over the coming week.

The Japan Meteorological Agency issues its first-ever “major earthquake warning,” warning that the Nankai Trough is a subduction zone where a magnitude 8-9 earthquake is likely to occur, and that there is a higher-than-usual risk of strong shaking and tsunamis. It urges people in the area to prepare.

The message is not a prophecy but an outlook for increasing risk, and it shows how far seismologists have come in understanding the dynamics of subduction-zone earthquakes.

Here’s what you need to know about the situation.

Dangerous subduction zones

The Nankai Trough is an underwater subduction zone where the Eurasian plate collides with the Philippine Sea plate, causing the latter to subduct beneath the Eurasian plate and sink into the Earth’s mantle.

Faults in subduction zones build up stress, and when the locked faults slip and release that stress, so-called megaquakes occur. “Mechatronics” is the shortened form of the name. These zones have produced some of the most powerful earthquakes in Earth’s history.

The Pacific “Ring of Fire” is a collection of subduction zones. In the United States, the Cascadia Subduction Zone off the West Coast stretches from Vancouver Island in Canada to Cape Mendocino in California.

The Nankai Trough fault is divided into several segments, but if the entire edge of the fault slips at once, Japanese scientists say the trough will It could cause an earthquake of up to magnitude 9.1.

In the southwestern Japanese city of Nichinan, beaches were closed on Friday after the country’s first warning of a possible major earthquake was issued.
Kyodo News via Reuters Connect

If a major earthquake were to occur off the coast of Japan, the Philippine Sea Plate would likely shake 30 to 100 feet near the country’s southeast coast, causing violent shaking.

Vertical displacement of the ocean floor could trigger a tsunami, sending waves crashing onto the coast of Japan that Japanese scientists estimate could reach heights of nearly 100 feet. Published in 2020.

History of major earthquakes

Large earthquakes occur in the Nankai Trough approximately every 100 to 150 years. In last year’s surveyJapan’s Earthquake Research Committee announced in January 2022 that there is a 70 to 80 percent chance of a major earthquake occurring in the next 30 years.

Great Nankai Trough earthquakes tend to occur in two separate events, with the second often occurring within two years of the previous one, recent examples being the “twin” earthquakes that occurred in the Nankai Trough in 1944 and 1946.

This phenomenon is due to the segmented nature of the fault, where a shift in one segment can put strain on other segments.

Thursday A magnitude 7.1 earthquake occurred at or near a subduction zone.According to the U.S. Geological Survey.

People stand outside after escaping a building following an earthquake in Miyazaki on Thursday.
Kyodo News via Associated Press

Harold Tobin, a professor at the University of Washington who studies the Nankai Trough, said the magnitude 7.1 quake occurred in a segment that shakes more frequently than other earthquakes. The regular quakes reduce stress, so there’s less concern that the segment itself could cause a big one. What’s concerning is the quake’s proximity to a segment that’s been building up stress since the 1940s.

“This one is adjacent to the Southwest Sea region and is obviously sealed off, so that’s a reason for caution and concern,” Tobin said.

Predictions, not predictions

Scientists cannot predict earthquakes, but they are developing the ability to forecast when danger is heightened, especially in areas like Japan where tremors occur frequently and monitoring is well established.

Source: www.nbcnews.com

Taiwan’s Earthquake Preparedness Shines, Surpassing US Efforts

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Taiwan experienced a significant earthquake on Wednesday, with experts noting that it was larger than some areas in the United States. The island was well-prepared for seismic disasters, which helped mitigate the impact. Despite nine reported deaths, authorities anticipate the death toll may increase. Over 1,000 individuals were injured, and around 100 are feared trapped.

The earthquake, measuring 7.4 in magnitude, highlighted Taiwan’s robust early warning system, modern seismic building codes, and the population’s familiarity with seismic activity. Following the devastating Chichi earthquake in 1999, Taiwan made substantial upgrades to its infrastructure to enhance resilience.

Geologist Larry Shuhen Lai, who grew up and studied in Taiwan, acknowledged the progress made in earthquake preparedness, comparing the nine deaths in the recent earthquake to the 2,400 casualties in the past. He emphasized Taiwan’s serious approach to earthquakes as part of daily life.

Experts noted that U.S. cities on the West Coast are taking various measures to prepare for earthquakes, but none are as well-prepared as Taipei, the capital of Taiwan.

A California Highway Patrol trooper checks for damage to a fallen car when the upper section of the Bay Bridge collapsed into the lower section after the Loma Prieta earthquake in San Francisco on October 17, 1989.George Nikitin/AP File

Taiwan is still assessing the earthquake’s impact and lessons learned, providing valuable insights for U.S. scientists and leaders to evaluate their own infrastructure and preparedness.

John Wallace, a civil engineering professor, highlighted the damage to older concrete buildings in Taiwan and emphasized the importance of retrofitting such structures. Taiwan’s skyscrapers, like Taipei 101, showcased advanced engineering that performed well during the earthquake.

Overall, experts commended Taiwan’s earthquake preparedness efforts, attributing them to the previous Chi-Chi earthquake that spurred significant improvements in safety measures and building codes.

Damaged buildings in Hualien City, Taiwan, on Tuesday.TVBS via AP

Taiwan’s gradual progress in earthquake safety, coupled with public education and trust in authorities, has been integral to its preparedness. Initiatives undertaken post the Chi-Chi earthquake have set the benchmark for earthquake resilience in the region.

The comparison with U.S. readiness, particularly on the West Coast, reveals disparities in earthquake preparedness, with Taiwan’s advanced early warning system being a standout feature. The system’s effectiveness in disseminating warnings and promoting public safety serves as a model for other earthquake-prone regions.

Both Taiwan and the U.S. utilize advanced warning systems based on seismic wave detection, highlighting the importance of continuous improvement and proactive measures to enhance earthquake resilience.

In conclusion, Taiwan’s 25-year journey towards earthquake preparedness offers valuable insights for other regions, emphasizing the significance of strategic planning, infrastructure upgrades, and community engagement in mitigating the impact of seismic events.

Source: www.nbcnews.com