SICHUAN EARTHQUAKE May 12, 2008

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Presentation transcript:

SICHUAN EARTHQUAKE May 12, 2008 BBC Science

fault area x slip x rigidity Science USGS 1. Find the seismic moment M0 = 8.9 * 10^20 Nm SEISMIC MOMENT M0 = fault area x slip x rigidity MOMENT MAGNITUDE Mw = 2/3 x (log M0 - 9.1) University of Nevada

2. Predict the rupture length (km) and average displacement (m) Wells and Coppersmith, 1994 500 km 10 m 3*10^11 * 500*10^3 * w * 10 = 8.9 * 10^20 --> w = 593 m ~ 1/2 km 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)

4. How do the intensity & aftershock distributions compare to the fault parameters you estimated? USGS 350 km vs. 500 km

5. How does the slip distribution from body wave modeling compare to the fault parameters you estimated? 7 m vs. 10 m w: 20 km vs. 1/2 km hmmm 20*10^3 * 280*10^3 * 7 * 3*10^10 = 11.8 * 10^20 = M0 --> Mw = 8.0 USGS

6. What type of faulting did it involve? 7. Which plane did it occur on? 8. What’s the tectonic cause? USGS Zhang et al., 2004 GPS site velocities wrt Eurasia