Rupture Process for May 12, 2008 Sichuan Earthquake (Ver. 2)
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M8 class earthquake has occurred in Sichuan, China, on May 12, 2008.
We obtained slip distribution solution using teleseismic body waves (P-waves) data recorded at IRIS-DMC stations. Constraints in the inversion procedure are determined by ABIC-minimum.
Rupture area extends about 300 km northeastward from the hypocenter, and the process is consisted of two distinct stages. In the first stage, component of reverse fault excels and continues for 50 seconds. The second stage starts about 60 seconds after the start at 100km northeast of the epicenter. Please see details in the figure of snapshot below.
Result
Seismic Moment Mo = 0.9068 x 10**21 Nm (Mw 7.9);
Rupture Duration T = 120 sec ;
(strike, dip, rake) = (229, 33, 147.6)
Hypocenter: (Lat. = 31.099 Lon. = 103.279, depth= 15 km).
(Naoki Nishimura and Yuji Yagi, University of Tsukuba)
Slip distribution. Star in the map indicate epicenter. Contour is 1m interval.
Fault mechanism, source time function, slip distribution
Slip velocity distribution plotted on distance-time plot
Comparison of observed waveform (black) and theoretical waveform (red)
Distribution of stations used in this analysis
Snapshot of the rupture process.
Numerical data of slip distribution:
fault plane format
map-projected format
Last updated on June 11, 2008
Contacts for questions: yagi-y@geol.tsukuba.ac.jp