Simulation of Near-fault Ground Motions by Using a 3D Quasi-Dynamic Model with Variable Rupture Velocities

Simulation of Near-fault Ground Motions by Using a 3D Quasi-Dynamic Model with Variable Rupture Velocities

The objective of this study is to propose a 3D quasi-dynamic model with variable rupture velocities to simulate the rupture and healing processes of a fault plane. Due to the different healing times defined by the proposed space-time slip function for all rupture points on the fault plane, the induced rupture snapshots are strongly asymmetric, and the rupture growth is intermediate between a circular rupture and a unilaterally propagating rupture. After that, based on the integral representation theory, the ground motions of a three dimensional half-space can be determined by means of the slip function on a fault plane as well as the Green's function due to a unit point source within the half-space. For checking the accuracy and validness of the proposed rupture model, the 1992 Landers Earthquake is selected as the target event, and the near-fault ground motions observed at the Lucerne Valley Station will be simulated by means of the specified source parameters in the modeling.