Abstract: The broadband seismic wave data of CDSN are used to make a further study on the source process of the Qinghai,Xijie M_S6.8 earthquake on November 5,1988. With the waveform fitting and global searching algrithm based on the optimized Genetic Algorithm,the source parameters and rupture characteristics are analyzed. The results show that this earthquake is an event dominated by one rupture and associated with a strike slip active fault which has slightly overthrust component. In the light of analyses for the effect of rupture direction upon the station quasi source time function,it is suggested that the rupture was likely to spread from SE to NW along the NW trending fault plane.

Key words: Source process, Waveform inversion, Genetic algorithm

摘要： 利用中国数字地震台网(CDSN)的宽频带数字化波形资料进一步研究了1988年11月5日青海省西捷M_S6.8级强震的震源过程。通过波形模拟和基于优化遗传算法的全局反演,对该地震的震源参数和破裂特征进行了分析。初步结果表明,此强震是以一次主破裂为特征的事件,与略带逆掩分量的走滑活动断层有关。根据单向破裂对各台站视震源时间函数的影响的分析,认为破裂可能是沿北西走向的断层面由东南向西北传播。

关键词: 震源过程, 波形反演, 遗传算法