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提出了近断层强地震动预测中建立活断层上设定地震有限断层震源模型的方法和步骤.首先,根据地震地质和地震活动性调查以及地球物理勘探等资料,确定活断层的空间方位和滑动类型;然后,根据地震定标律确定活断层的宏观震源参数;第三,将高强体模型与k平方滑动模型相结合,产生断层破裂面上的混合滑动分布.在此基础上,预测了与1994年Northridge地震断层类型、矩震级(Mw6.7)基本一致的设定地震的有限断层震源模型.最后,将预测的有限断层震源模型与基于地震学的、使用动力学拐角频率的地震动随机合成方法相结合,预测了1994年Northridge地震近断层12个基岩台站的加速度时程,并和实际记录进行了对比.结果表明,用上述方法和步骤建立的有限断层震源模型是可行、实用的.
This paper put forward the method and procedure of establishing the focal fault model of active faults on the basis of the prediction of near-fault strong ground motion.Firstly, based on the data of seismic geology, seismic activity survey and geophysical prospecting, the spatial orientation and slip of active fault Then, the macroscopic source parameters of the active fault are determined according to the seismic calibration law. Thirdly, by combining the high-strength model with the k-squared slip model, a mixed slip distribution is generated on the fault rupture plane. On this basis, In 1994, the Northridge earthquake fault type and moment magnitude (Mw6.7) were basically the same as the finite fault source model of earthquake.Finally, the predicted finite fault source model and the seismological ground motion using dynamic corner frequency were randomly selected , The acceleration time history of 12 bedrock stations near the fault in Northridge earthquake in 1994 was predicted and compared with the actual records.The results show that the finite fault source model established by the above methods and steps is feasible and practical of.