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An avalanche is a large mass of snow rapidly moving down a mountainside that can travel as fast as 80 miles per hour (mph). When it stops, the snow debris left behind can become as solid as concrete. While primarily a phenomenon in the western United States, avalanches can also occur in mountainous regions of the Northeast.
An earthquake is the sudden, rapid shaking of the earth, caused by the breaking and shifting of subterranean rock as it releases strain that has accumulated over a long time.
Earthquake hypocenters are usually less than 50 miles below the Earth’s surface and are accompanied and followed by a series of vibrations. The epicenter—the point where an earthquake originates—is directly above the hypocenter on the surface. Earthquakes occur without any obvious warning.
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