The Pyramid of Khufu has stood majestically on the Giza Plateau for over 4,500 years, enduring countless earthquakes with minimal structural damage. A recent study from Egypt’s National Institute of Astronomy and Geophysics uncovers a quantitative explanation for this astonishing durability. The research reveals a significant discrepancy between the natural vibration frequency of the pyramid and that of the surrounding ground. This difference may have protected the monument from destructive resonance during seismic events.

The Great Pyramid, commonly referred to as the Pyramid of Khufu, was commissioned by Pharaoh Khufu (also known as Cheops) over approximately 26 years around 2600 BC. It holds the title of the oldest among the Seven Wonders of the Ancient World.

Originally towering at about 147 meters, it was the tallest man-made structure for more than 3,800 years until surpassed by Lincoln Cathedral in England in 1311 AD.

Today, its height stands at approximately 137 meters, reflecting the loss of its original smooth limestone casing over the centuries.

Since its completion, the Pyramid of Khufu has withstood numerous earthquakes, including significant events with estimated magnitudes of 6.8 in 1847 and 5.8 in 1992, without suffering major damage.

However, evidence supporting theories on its structural resilience remains scarce.

According to lead author Dr. Asem Salama and fellow researchers from Egypt and Japan, “The Pyramid of Khufu is the oldest pyramid constructed during the Old Kingdom on the northwestern Giza Plateau in Cairo.”

“Originally, the pyramid reached a height of 146.59 meters, with a base length of approximately 230.33 meters on each side and an inclination angle of 51 degrees.”

“Current measurements reflect a height of about 137 meters, indicating the loss of its outer casing stone and pinnacle over time.”

The pyramid’s structure features a central core and a horizontal stone casing, interspersed with support blocks.

It is estimated to contain approximately 2.3 million stone blocks, each meticulously placed to achieve its monumental scale and stability.

Internally, the pyramid comprises eight main elements: the primary entrance with a descending passage, the entrance created by the workers of Caliph al-Ma’mun, the crypt, the grand gallery, the queen’s chamber, the king’s chamber, the aid chamber, and the shaft.

This intricate arrangement exemplifies the advanced engineering and architectural prowess characteristic of Old Kingdom pyramid construction.

In the recent study, researchers recorded seismic noise from 37 locations, including the king’s chamber, queen’s chamber, pressure relief chamber, construction blocks, and surrounding soil.

Most sections of the pyramid exhibited a surprisingly consistent fundamental frequency between 2 and 2.6 hertz, while the surrounding soil vibrated at roughly 0.6 hertz.

This frequency separation likely reduced the risk of earthquakes amplifying internal vibrations within the structure.

The researchers also observed that vibration amplification tends to increase with height inside the pyramid, but decreases in the pressure relief chamber above the King’s Chamber, indicating these spaces may help dissipate seismic stress.

However, researchers caution against overemphasizing these findings. While frequency mismatch may account for some of the pyramid’s durability, there is no direct evidence that ancient Egyptian builders intentionally designed their structures for earthquake resistance.

The team noted, “The suggestion of deliberate seismic optimization by ancient Egyptian architects remains speculative and cannot be substantiated by geophysical measurements alone.”

The study’s findings were published in the Journal on May 21, 2026, in a report by Scientific Reports.

_____

M. Elgabri et al. 2026. Architectural and geotechnical aspects affecting the earthquake resistance of the Pyramid of Khufu in ancient Egypt. Scientific Reports 16, 14032; doi: 10.1038/s41598-026-49962-6