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Research published in Scientific Reports suggests that the Great Pyramid was designed to spread seismic energy and avoid the effect of tremors, which helps explain why the structure remains firm to this day.
The Pyramids of Giza have stood for 4,500 years, even in a region that has faced earthquakes strong enough to destroy modern buildings. Now, a new study has provided an important clue to explain this resilience: the Great Pyramid appears to have been designed to distribute seismic energy rather than concentrate it.
Researchers point out that the structure exhibits advanced geotechnical features for its time. In practice, this helps to understand why the pyramid remains firm while so many more recent buildings do not withstand tremors in the same way.
The study was published on May 21 in the journal Scientific Reports and analyzed how the pyramid reacts to natural environmental vibrations. The conclusion is that the construction not only resisted time but also seems to have a design intended to deal with earthquakes.
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An ancient structure that continues to defy tremors
The Pyramids of Giza are located in the metropolitan area of Cairo and form one of the most well-known complexes of Ancient Egypt. The largest of them, the Great Pyramid, once stood about 146 meters tall and today measures approximately 137 meters, after centuries of wear and loss of casing.
Even so, the structure has survived significant seismic events. In 1847, a strong earthquake hit Cairo, causing deaths and destroying hundreds of buildings. The pyramids remained standing, with losses mainly in the outer stones. Another significant tremor occurred in October 1922, when casing stones fell from the top of the pyramid.
This history has always fueled the curiosity of scientists and architects. The pyramidal shape, reinforced base, and joints between the blocks were already seen as factors that helped with stability. But there was still a need to better understand how the structure behaves in the face of seismic waves.
What researchers found inside the Great Pyramid
To investigate the monument, scientists used the Nakamura Method, also known as HVSR, a vibration analysis technique used to study the seismic behavior of structures and soil. Measurements were taken at 37 points of the Great Pyramid, including internal chambers, ventilation shafts, passages, building blocks, and surrounding areas.
The result was striking: inside the pyramid, the vibrations were very close to each other, ranging between 2 and 2.6 hertz. This indicates an extremely homogeneous structure, without abrupt differences that usually weaken buildings during an earthquake.
In common constructions, so-called “fragile zones” can arise, places where vibration concentrates and increases the risk of cracks or collapse. In the case of the Great Pyramid, the study did not find this type of critical point, which reinforces the idea of much more sophisticated engineering than was imagined for the time.
The difference between the pyramid’s vibration and the ground’s helps in resistance
Another important finding came from the surrounding terrain. The ground showed vibrations close to 0.6 hertz, well below the average recorded inside the pyramid. This difference is crucial because it prevents the resonance effect, when the frequency of the ground and the construction approach each other and cause seismic energy to grow.
When this happens, the impact of the tremor can increase significantly. Since the pyramid’s frequency is very different from that of the terrain, this effect does not occur with the same force. For the researchers, this separation between the vibrations helps explain part of the structure’s stability.
The study also identified how seismic energy spreads
The research also analyzed the so-called seismic amplification, which occurs when waves pass through different geological layers and can gain amplitude. In the Great Pyramid, this amplification increases as the height rises, but after about 48 meters, it begins to gradually decrease.
This behavior suggests yet another layer of natural protection for the construction. Instead of allowing energy to accumulate dangerously, the pyramid seems to channel it more controlledly along the structure.
The results reinforce the image of the Pyramids of Giza as much more than historical monuments. They stand as proof of architectural and geotechnical knowledge that continues to amaze to this day. If this type of study also impresses you, share the article and tell us what caught your attention most about the pyramids of Egypt.
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