EPS 20 - Causes of quakes 0923

EPS 20 - Causes of quakes 0923 - Reverse Fault...

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Unformatted text preview: 2008-09-23Reverse Fault: •Compressional tectonic environment •Responsible for creation of mountains Earthquake•Actual 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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This note was uploaded on 10/12/2008 for the course EPS 20 taught by Professor Allen during the Fall '08 term at Berkeley.

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EPS 20 - Causes of quakes 0923 - Reverse Fault...

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