earthquakes 17

earthquakes 17 - Earthquakes 17 November 13, 2007...

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Earthquakes 17 November 13, 2007 Foreshocks: smaller earthquakes that precede main shock - Roughly the same location as main shock (within approx. 1 rupture length) - Within same time period (days to weeks) - Can’t tell if its foreshock until you see the main shock.  - Most earthquakes do not have a foreshock (5% do for Californian strikes slip  earthquake) o % of earthquakes with foreshocks varies for different kinds of faults.  o More common in normal earthquakes and uncommon in reverse. o The deeper focal depth is, the lower chance for foreshock.  Main shocks: largest event in a cluster of earthquakes Aftershocks: earthquakes smaller than main shock that occurs after main shock - Occurs in approximately same location (within 1 main shock rupture length) - Can occur long afterwards for larger earthquakes, but may persist for only hours for  smaller ones o
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This note was uploaded on 01/23/2009 for the course GEOL 240Lxg taught by Professor 12:30-01:50pm during the Fall '07 term at USC.

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earthquakes 17 - Earthquakes 17 November 13, 2007...

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