Overview
- A peer-reviewed study published Thursday used seismometers to record tiny ambient vibrations and produced direct measurements that explain the monument’s seismic response.
- Researchers placed sensors at 37 sites inside and around the Khufu Pyramid, including the King’s Chamber, the relieving chambers, passages, outer stones and surrounding soil to map how the structure vibrates.
- The team found the pyramid’s dominant frequency is about 2.3 hertz while the surrounding soil vibrates near 0.6 hertz, a mismatch that lowers the chance of resonance and large amplification of quake energy.
- Measurements showed a mostly uniform structural response with amplification rising with height but dropping in the relieving chambers above the King’s Chamber, and the hard limestone bedrock and blocks further limit shaking.
- Authors say the data strengthen a physical explanation for the pyramid’s long survival but stop short of proving ancient builders intended seismic design and call for further archaeological and engineering study with conservation applications.