Study links Great Pyramid resilience to soil-structure vibration mismatch

A new scientific study has identified key structural features that explain the remarkable seismic resilience of Egypt's Great Pyramid of Giza, which has endured for over 4,600 years. The research suggests the pyramid's design and the materials used in its construction have helped it withstand significant earthquakes, including a magnitude 6.8 event in 1847 and a magnitude 5.8 quake in 1992.

Led by researchers from Egypt's National Research Institute of Astronomy and Geophysics, the investigation involved recording ambient vibrations at 37 locations within the pyramid and on the surrounding ground. These vibrations, caused by everyday sources like distant traffic and ocean waves, revealed a critical difference: the soil around the pyramid vibrates at a frequency of approximately 0.6 hertz, while the structure itself resonates at frequencies between 2.0 and 2.6 hertz. This mismatch likely reduces the risk of resonance during an earthquake, a process where matching frequencies can amplify vibrations and cause severe damage.

The analysis also showed that mechanical stress is evenly distributed throughout the pyramid's estimated 2.3 million stone blocks. Furthermore, the study...