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Unformatted text preview: Less than 3.5: generally not felt 6.1-6.9: can be destructive 7.0-7.9: Major earthquake 8 +: Great earthquake ht p:/ www.seismo.unr.edu/ftp/pub/louie/class/100/magnitude.html 15 Seismograph 16 Earthquakes Damage: Shaking Landslides Land subsidence Fires tsunamis 17 Earthquakes Factors determining damage: Magnitude Distance Soil conditions Buildings 18 Earthquake Damage Some earth materials amplify the shaking 3 19 Earthquake Damage ht p:/ www.boisestate.edu/history/ncasner/hy210/mexico.htm Mexico City Earthquake (1985): More damage because part of the city built on soft sediments. 20 Earthquake Damage 21 Earthquakes Small quakes Rising or tilting of ground Release of radon gas Change in water level Animals Historic trends Prediction?? We cant. 22 Earthquakes Location: Most on plate boundaries Centers of plates/failed rifts 23 End of Lecture...
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This note was uploaded on 04/21/2008 for the course GEOL 101 taught by Professor Jeeze during the Winter '08 term at San Diego State.
- Winter '08