Effect of the time-weakening friction law during the nucleation process

作者：Feng Hu,Hanqing Huang,Xiaofei Chen

摘要：Based on dynamic rupture simulations on a planar fault in a homogeneous half-space, we investigated the nucleation processes using the time-weakening friction law. Both the characteristic time and the rupture speed in the nucleation asperity play an important role in determining rupture behaviors on a fault plane following the time-weakening friction law, with which rupture starts from a single point in the nucleation asperity and propagates at a given speed toward the boundary of the nucleation area. Rupture with a small characteristic time or a large rupture speed in the nucleation asperity propagates earlier from the hypocenter. Rupture following the slipweakening friction law requires a smaller radius of nucleation patch to have similar rupture front contours of the time-weakening friction law. Even if the rupture velocity in the nucleation patch of the time-weakening friction law increases to infinity, the peak slip rate in the nucleation asperity is smaller than that of the slip-weakening law. The peak ground velocity distributions of ruptures following the two friction laws are also compared.

发文机构：Laboratory of Seismology and Physics of Earth's Interior andSchool of Earth and Space Sciences Department of Earth and Space Science

关键词：摩擦定律利用时间成核过程弱化动态断裂特征时间峰值分布大破裂Time-weakening friction law Slip-weakening friction law Dynamic rupture Ground motion

分类号： O313.5[理学—一般力学与力学基础][理学—力学]S834.4[农业科学—畜牧学][农业科学—畜牧兽医]