Study On The Impact Of Wenchuan Earthquake To The Nearby Non-causative Faults

The sliding of rock mass on both sides of a causative fault sometimes causes thenearby non-causative faults’ dislocation.This phenomenon was proved by the post-quakeinvestigation of Wenchuan earthquake,which showed that there was several surface rupturepoints along the Jiangyou-Guangyuan fault and the Wenchuan-Maoxian fault, in addition tothe Yingxiu-Beichuan fault in the Central fault zone and the Anxian-Guanxian fault in thePiedmont fault zone. Relative to a certain degree of influence on site distribution ofearthquake damage, Non-causative faults’ dislocation has an inconclusive impact ongroundmotion.It’s generally acknowledged that stick-slip process between rock mass along aseismogenic fault refects the mechanism of an earthquake. Recent research indicates thatthis process could be well explained by the rate-and state-dependent friction law(RSF law)based on phenomenological opinions.In order to analyze the impact of the Wenchuan earthquake on the nearby non-causative faults, the paper carries out the following work:1. Describes the two forms of the RSF law,the slip law and the slowness law;Deducethe stability condition of an rock-faults system under a small perturbation by using theslowness law,and then a numerical example would be provided to discuss the influence ofparametres’variation.2. Preliminary analyzes the Jiangyou-Guangyuan fault and the Jiandi piedmont fault’sstates caused by Wenchuang earthquake,using the data of several seismostations’acceleration records in the main shock of Wenchuan earthquake,Dakang town’s buildingearthquake damage data and Jiandi area’s surface rupture data.3. Bulids two-dimensional ABAQUS models of Dakang area and Jiandi area,and thenstudies the dislocation response of the non-causative faults caused by the sliding of rockmass on both sides of Wenchuan earthquake’s causative faults.