SICHUAN EARTHQUAKE May 12, 2008€¦ · USGS ShakeMap EASTERN SICHUAN. CHINA Mon May 12 2008 01 GMT...
Transcript of SICHUAN EARTHQUAKE May 12, 2008€¦ · USGS ShakeMap EASTERN SICHUAN. CHINA Mon May 12 2008 01 GMT...
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SICHUAN EARTHQUAKE May 12, 2008
BBC
Science
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University of Nevada
1. Find the seismicmoment
ScienceUSGS
SEISMIC MOMENT M0 =fault area x slip x rigidity
MOMENT MAGNITUDE Mw =2/3 x (log M0 - 9.1)
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Wells andCoppersmith, 1994
2. Predict the rupture length (km) and average displacement (m)
3. Use these and the moment to predict the downdip dimension(fault width). Use rigidity = 3*1010 Pa (1 Pascal=N/m2)
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4. How do the intensity &aftershock distributionscompare to the faultparameters you estimated?
USGS
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5. How does the slipdistribution frombody wave modelingcompare to the faultparameters youestimated?
USGS
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GPS site velocities wrt Eurasia
6. What type offaulting did itinvolve?
7. Which planedid it occur on?
8. What’s thetectonic cause?
USGS
Zhang et al., 2004