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Earthquakes Cornell Notes page 117 What is an • Shaking or trembling of the Earth’s surface Earthquake? • Creates seismic waves What causes Earthquakes? • Sudden movements in Earth’s crust –Stress builds up until rock finally breaks • Volcanic activity • Landslides • Nuclear Tests Earthquakes do NOT cause the crust to move- The moving crust causes Earthquakes!! Where do Earthquakes usually occur? • Plate boundaries and faults Parts of an Earthquake: • Underground location of event that causes Focus earthquake Parts of an Earthquake: Epicenter • location of an earthquake on the surface • directly above the focus. What’s the largest Earthquake in the U.S.? • Alaska 115 died-- most deaths due to the tsunami • Shaking was felt earthquake of March 27, 1964. It had a magnitude of 9.2. • for an estimated 7 minutes • raised or lowered the ground approx. 56 feet in some places. • length of the ruptured fault was 621 miles. • energy released was equal to 12,000 Hiroshima-type blasts. Largest in World… • Chile (1960)- 9.5