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A dam can cause an earthquake because large amounts of water are stored behind a dam. There may also be a large building at the site. This can cause pressure along a fault to make it move, resulting in an earthquake. This is called induced seismicity. The Earth's crust is affected by added pressure and stress due to the weight of the water behind the dam. Although not enough is known about dam-induced earthquakes, it is believed that seismicity occurs in dams with heights greater than 330 feet.
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