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EARTH QUAKE REFERENCE FILES EARTHQUAKE REFERENCE FILES Earthquake shaking of the earths surface caused by rapid movement of the earths rocky outer layer Earthquakes occur when energy stored within the earth usually in the form of strain in rocks suddenly releases This energy is transmitted to the surface of the earth by earthquake waves The study of earthquakes and the waves they create is called seismology Scientists who study earthquakes are called seismologists Websters p423 The destruction an earthquake causes depends on its magnitude or the amount of shaking that occurs The size varies from small imperceptible shaking to large shocks felt miles around Earthquakes can tear up the ground make buildings and other structures collapse and create tsunamis large sea waves Many Lives can be lost because of this destruction The Road to Jaramillo p211 Several hundred earthquakes or seismic tremors occur per day around the world A worldwide network of seismographs detect about one million small earthquakes per year Very large earthquakes such as the 1964 Alaskan earthquake which measured 86 on the Richter scale and caused millions of dollars in damage occur worldwide once every few years Moderate earthquakes such as the 1989 tremor in Loma Prieta California magnitude 70 and the 1995 tremor in Kbe Japan magnitude 68 occur about 20 times a year Moderate earthquakes also cause millions of dollars in damage and can harm many people The Road to Jaramillo p213-215 In the last 500 years several million people have been killed by earthquakes around the world including over 240000 in the 1976 Tang-Shan China earthquake Worldwide earthquakes have also caused severe property and structural damage Good precautions such as education emergency planning and constructing stronger more flexible structures can limit the loss of life and decrease the damage caused by earthquakes The Road to Jaramillo p213-215263 AN EARTHQUAKES ANATOMY Seismologists examine the parts of an earthquake like what happens to the earths surface during
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