Building Resonance. Why do some buildings fall in earthquakes?

Описание к видео Building Resonance. Why do some buildings fall in earthquakes?

Building Resonance: Structural stability during earthquakes.

Why do some buildings fall in earthquakes?

All buildings have a natural period, or resonance, which is the number of seconds it takes for the building to naturally vibrate back and forth. The ground also has a specific resonant frequency. Hard bedrock has higher frequencies softer sediments. If the period of ground motion matches the natural resonance of a building, it will undergo the largest oscillations possible and suffer the greatest damage. A classroom demonstration follows the animated portion of this video clip.

Source:
iris.edu
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