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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 can’t. 22 Earthquakes Location: •Most on plate boundaries •Centers of plates/failed rifts 23 End of Lecture...
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- Winter '08
- Earthquakes, Earthquakes Earthquakes, California Earthquakes