GEO 101 Lecture Notes - Lecture 14: Japan Trench, Hypocenter, Divergent Boundary
22 Feb 2017
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Document Summary
Why should we care: much of the world"s population lives in areas where earthquakes are a hazard. Earthquakes happen during certain kinds of weather. Big earthquakes always happen early in the morning. Animals can sense when earthquakes are going to occur. California is going to fall into the sea. The ground can open up and swallow people. The safest place to be in an earthquake is under a doorway. Shansi, china: 830,000 killed; january 23, 1556 most catastrophic. Valencia street hotel: san francisco, california, april 19, 1906. Shaking of the earth caused by a sudden release of energy. Shallow-focus earthquakes are generally the most destructive. Earthquakes occur at every type of plate boundary. What is a fault: fractures/cracks along which movement has occurred, most earthquakes occur due to movement on faults (release of energy during movement) Types of faults: dip-slip faults, primarily accommodate vertical motion, four types, normal, reverse, thrust, oblique. Hanging wall moves down relative to the footwall.
