9_21_07 - EARTHQUAKES 9/21/07 Quiz next class- scantron...

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EARTHQUAKES 9/21/07 Quiz next class- scantron (bring pencil!) Topics: Creation of the Universe/Earth, Materials of Earth, Plate Tectonics, and Earthquakes A. Elastic failure of rocks a. Bend- under pressure/temperature b. It breaks = earthquake B. Rapid slip on a fault Where are earthquakes? Not random- in collections because of plates What is plotted on a map? Epicenter- surface expression directly above the actual earthquake o Actual fault may or may not be near epicenter Focus- physical position (where rock started to break) inside the earth o Shallow angle fault- “thrust fault” Why do we care? Destruction o Most earthquake destruction: Japan, US, Russia o Most earthquakes- Alaska Valuable info about earth’s interior o Seismographs – plot earth’s mantle/core composition Seismology o Can create mini-earthquakes to measure depth- measures the waves as they “bounce” off bedrock, etc Richter Scale (logarithmic scale of energy release) vs. Mercalli Scale (Mercalli failed-
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This note was uploaded on 04/07/2008 for the course ENV 114 taught by Professor Cole during the Spring '08 term at Northeastern.

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9_21_07 - EARTHQUAKES 9/21/07 Quiz next class- scantron...

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