How has Great Pyramid survived earthquakes for 4,600 years?

For more than 4,600 years, the Great Pyramid of Giza has stood almost unchanged on the edge of the Egyptian desert. A new scientific study suggests that its extraordinary resilience may stem not only from its immense size, but also from a combination of sophisticated construction, favourable geology, and a natural resistance to earthquake vibrations.

The study, published on 21 May in Scientific Reports, found that the Pyramid of King Khufu possesses dynamic and geological characteristics that may have protected it from severe earthquake damage over thousands of years.

At the centre of the research lies a simple but enduring question: why has the Great Pyramid remained remarkably stable despite millennia of earthquakes, environmental stress, and ageing?

To investigate, researchers used a non-destructive geophysical technique known as the horizontal-to-vertical spectral ratio (HVSR). The method measures tiny natural vibrations in the ground and structures, generated by wind, human activity, traffic or weak seismic movement. By analysing these vibrations, scientists can determine how buildings and the surrounding earth respond to shaking.

The research team conducted 37 measurements inside and around the pyramid, including readings from the King’s Chamber, the Queen’s Chamber, internal corridors and the upper relieving chambers above the King’s Chamber, as well as from the surrounding soil and bedrock.

The results showed that most sections of the pyramid vibrate at highly similar natural frequencies; mainly between 2 and 2.6 hertz, with an average of around 2.3 hertz. This indicates that the pyramid behaves less like a collection of individual stone blocks and more like a single, cohesive structure when subjected to vibration.