Abstract
The source rupture process of the July 11, 2004, Tibet (Mw 6.2) earthquake is investigated by the finite fault model using far field broadband body wave records. The results show that it's a shallow, predominantly dip-slipping, normal-fault earthquake, and the hypocentral depth is about 12.5km. The fault plane has a strike of 152° and a dip of 44°, and the average slip angle is –117°. The rupture nucleates near the hypocenter, then propagates to the two ends of the fault with an average velocity of 2.8km/s, and the slip reaches to its maximum value of 43cm at about 5km northeast of the epicenter. The main principal tension axis of the fault plane solution shows roughly EW extension, which is controlled by the local rift belt in NNW-SSE or nearly NS direction, and the thrust motion of the India plate towards north is the main mechanical reason of this earthquake.
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