Investigations on the active tectonics and surface ruptures of theWenchuan Earthquake

摘要

Wenchuan earthquake is a thrust with strike-slip type, and surface ruptures are located in Beichuan fault , Pengguan fault zone, Xiaoyudong tear fault, and Leigu tear fault. The scratches of the surface rupture reveal the thrust movement occurred early and the strike-slip movement occurred lately during the earthquake. A dynamical model to illustrate possible links between surface processes and upward extrusion of lower crustal flow channel at the eastern margin of the Tibetan plateau have been studied, and the results is the material in lower crust in the Longmen Shan moving as nearly-vertical extrusion and uplift , resulting in the surface rate of tectonic movement differing according to depth rate as well as the occurrence of large shallowWenchuan earthquake.