Seismic WavesCreated By: Joshua


You may think of the Earth as a solid structure, but in fact the Earth’s crust is floating on a semi-liquid layer of molten rock (magma) just below the crust.Seismic waves are waves of energy that travel through the Earth's layers, and are a result of an earthquake, explosion, or a volcano that imparts low-frequency acoustic energy.

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  1. The largest recorded earthquake in the United States was a magnitude 9.2 that struck Prince William Sound, Alaska on March 28, 1964.
  2. The largest recorded earthquake in the world was a magnitude 9.5 in Chile on May 22, 1960.
  3. The earliest reported earthquake in California was felt in 1769 by the exploring expedition of Gaspar de Portola while the group was camping about 30 miles southeast of Los Angeles.
  4. Before electronics allowed recordings of large earthquakes, scientists built large spring-pendulum seismometers in an attempt to record the long-period motion produced by such quakes. The largest one weighed about 15 tons.
  5. The average rate of motion across the San Andrea's Fault Zone during the past 3 million years is 2 in/yr. This is about the same rate at which your fingernails grow.




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Seismic Waves



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