Research of Stochastic Finite Fault Based on Energy

Stochastic finite-fault method now is widely used to simulate near-field ground motion. This paper aim to the synthesized acceleration time history by existed stochastic finite-fault method, whose energy at lower frequency has an obviously 'sag'. Based on near-field record data on bedrock and source model of Northridge earthquake of America, the energy accumulation curve of record time history and synthesized time history by stochastic finite-fault method is investigated to reveal the difference law of energy distribution between record and synthesized time history, then an improved method for stochastic finite-fault method based on energy is propose. The record data and source model of Wenchuan earthquake are used to verify the rational and validity of the proposed method. Comparison and analyzing shows that acceleration from stochastic finite-fault method based on energy, which change laws of energy accumulation distribution curve in frequency domain and laws of response spectrum in period are both more close to the record than original method. So the results confirmed the rationality and validity of the improved method.