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Bulletin of the Seismological Society of America; October 2004; v. 94; no. 5; p. 1795-1807; DOI: 10.1785/012003095
© 2004 Seismological Society of America
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Article

Source Rupture Process of the Tecomán, Colima, Mexico Earthquake of 22 January 2003, Determined by Joint Inversion of Teleseismic Body-Wave and Near-Source Data

Yuji Yagi, Takeshi Mikumo, Javier Pacheco and Gabriel Reyes

International Institute of Seismology and Earthquake Engineering
Building Research Institute
1 Tatehara, Tsukuba, Ibaraki-ken
305-0802, Japan
yagi{at}kenken.go.jp
(Y.Y.)
Instituto de Geofisica
Universidad Nacional Autonoma de Mexico
Ciudad Universitaria, Mexico 04510 D.F., Mexico
(T.M., J.P.)
Resco, Universidad de Colima
Colima, Mexico
(G.R.)

Manuscript received 14 May 2003.

The spatial and temporal slip distribution of the Tecomán, Colima, Mexico earthquake is estimated from near-source strong-motion and teleseismic body-wave data. To perform a stable inversion, we applied smoothing constraints and determined their optimal relative weights on the observed data using an optimized Akaike's Bayesian information criterion (ABIC). The source parameters are as follows: (strike, dip, slip) = (300°, 20°, 93°), seismic moment M0 = 2.3 x 1020 N m; source duration = 30 sec; along-strike distance = 35 km; along-dip distance = 70 km. We found that the rupture process can be divided into three stages: the rupture nucleated near the hypocenter (stage I), then it broke the first asperity centering about 15 km southwest from the epicenter (stage II); and the rupture propagated to the northeast and the second asperity was broken (stage III). We also estimated the shear-stress change due to the rupture process of the mainshock on and around the major fault zone. It appears that one cluster of aftershocks for the first 5 days, which took place in and adjacent to the zones of stress, increased due to the fault rupture during the mainshock, but overall correlation between the aftershock location and the stress pattern is not clear.




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