The Great Pyramid of Khufu, the largest and most impressive surviving monument from the ancient world, has long remained an enigma to scholars. One reason is its remarkable resistance to damage from events such as earthquakes, which has helped it endure for thousands of years without significant structural issues.
Now, researchers say they finally understand the ancient technological factors behind the pyramid’s resilience throughout time.
According to new research, the unique frequency at which the pyramid vibrates during earthquakes contrasts significantly with the sands of the Giza plateau on which it rests. This, a new study in Scientific Reports argues, along with the massive structure’s shape and internal design, has all played a part in helping ensure its longevity.
A Marvel of the Ancient World
Khufu’s Pyramid, often simply called the Great Pyramid, is the oldest of the Seven Wonders of the Ancient World and the sole surviving example. Scholars have maintained a fascination with Giza’s monumental megastructures since antiquity, and debate over the mystery of its construction continues into the present day.
Completed during Egypt’s Old Kingdom (2600–2450 BCE), the Great Pyramid raises a significant question about the structural qualities that have contributed to its longevity. Addressing this aspect of one of the greatest engineering feats of the ancient world, researchers Mohamed ELGabry and colleagues Ayman Hamed, Sakuji Yoshimura, Hesham M. Hussein, Mohamed Maklad, and Asem Salama now say a combination of factors, which include the internal features within the pyramid, all contribute to its success at surviving events that have damaged smaller, more structurally sophisticated monuments in Egypt.
Using Sound to Solve an Ancient Mystery
To help them determine the factors that contribute the most significantly to the longevity of Khufu’s Pyramid, the research team began with an ambient noise survey, which involved horizontal-to-vertical spectral ratio analysis at more than three dozen locations throughout the ancient structure, which included chambers within the pyramid, construction blocks, and adjacent soil.
Their approach was not only successful but also revealed surprising insights into the pyramid’s construction, the team says.
Among the most significant discoveries, the team says they found that the pyramid “exhibits uniform fundamental frequencies (2.0–2.6 Hz) with an average of ~ 2.3 Hz across all structural elements,” revealing an extraordinary consistency in terms of the structure’s dynamic characteristics.
Also important, they say, is that the frequency band the pyramid’s structural components exhibit contrasts sharply with the surrounding soil. This is important because it limits the amplification of resonance through interactions between the stone assembly of the structure and its surrounding soil, which the team identifies as “a key mechanism protecting the monument during seismic activity.
Finally, although the team identifies an increase in seismic amplification with respect to the structure’s height, they also found that it “diminishes substantially within the pressure-relieving chambers,” which they interpret as an indication of “how their geometry actively reduces seismic response.”
Ancient Earthquake Impact Reduction
As a final consideration, the team also examined the pyramid’s subsurface foundation, where they calculated the structure’s vulnerability to seismic events.
After determining a very low value, the team concludes that the pyramid’s foundation has an “excellent bearing capacity and minimal earthquake-induced risk,” noting that, in addition to the monument’s resilience over time, its unique structural properties will likely protect it from future damage.
“The low seismic vulnerability index estimated for the foundation soils suggests that any future earthquakes are likely to produce only limited damage to the main pyramid body,” the team reports in their study.
Arguably, the team’s most significant finding is that the pyramid’s ancient builders possessed an exceptionally advanced understanding of the engineering properties behind the stone used in its construction.
“These findings present compelling quantitative evidence that ancient Egyptian architects possessed profound geotechnical understanding, optimizing structure design and site characterization to assure millennial-scale stability against seismic hazards,” the team reports.
The recent study, “Architectural and geotechnical aspects affecting earthquake resilience for the antique Egyptian Khufu pyramid,” appeared in Scientific Reports on May 21, 2026.
Micah Hanks is the Editor-in-Chief and Co-Founder of The Debrief. A longtime reporter on science, defense, and technology with a focus on space and astronomy, he can be reached at micah@thedebrief.org. Follow him on X @MicahHanks, and at micahhanks.com.