EPS 20 - Causes of quakes 0923

EPS 20 - Causes of quakes 0923 - 2008-09-23Reverse Fault:...

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Unformatted text preview: 2008-09-23Reverse Fault: Compressional tectonic environment Responsible for creation of mountains EarthquakeActual rupture on the earth Occurs on the fault, initiates at the focus (on fault plane) Epicentre point right above the focus But can only pinpoint a point if quake is relatively small Must know lat, long, depth of quake to plot epicentreQ: Where do earthquakes occur?Recurrent Earthquake cycle 140 year interval for Hayward, larger quakes have recurrence interval of 100s of years For accurate picture, need records going back thousands of years China records from 780 BC longest record Japan records from 1600 ADGreece to Afghanistan (active region) records from 300 AD California records from 1800 AD written records of quakes is pathetic, one of challenges studying quakes in California Turkey 1999, 20000 deadIndia 2001, 30000 deadIran 2003, 40000 deadSumatra 2004, 250000 in earthquake and tsunami Pakistan 2005, 80000 deadSichuan 2008, 75000 deadLarge quakes nearly every year over last decade, >2 million deaths Large fatality quakes happen in the same area / same elevationOfficial death count of San Fransisco quake very low but no true account Q: Where do high fatality earthquakes occur?Q: Where do high fatality earthquakes occur?...
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EPS 20 - Causes of quakes 0923 - 2008-09-23Reverse Fault:...

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