随机有限断层法及其工程应用中的问题分析  

Stochastic Finite Fault Method and Its Engineering Applications

作　　者：张冬锋 付长华[1] 吕红山[1] 俞瑞芳[1] Zhang Dongfeng;Fu Changhua;Lv Hongshan;Yu Ruifang(Institute of Geophysics,China Earthquake Administration,Beijing 100081,China)

机构地区：[1]中国地震局地球物理研究所,北京100081

出　　处：《震灾防御技术》2018年第4期784-800,共17页Technology for Earthquake Disaster Prevention

基　　金：国家重点研发计划(2017YFC0404901);国家自然科学基金(51478440)

摘　　要：随机有限断层法作为半经验半理论的地震动合成方法,综合考虑了震源、传播路径以及场地条件对地震动的影响,可在工程关注的频率范围内模拟地震动时程,为实现较大区域地震动模拟提供了一种有效的方法。本文系统阐述了随机有限断层法的基本原理、静力学拐角频率模型及动拐角频率模型的发展;分析了主要模型参数(断层尺度、破裂速度、剪切波速及应力降)、Kappa因子和介质品质因子的取值原则,并结合中国大陆的实际情况给出了相应的取值范围;最后讨论了现有模拟方法在考虑参数取值、子断层划分和子断层之间相互作用等方面的不足以及能量处理方式上的缺陷,明确了随机有限断层法发展的方向。As a semi-empirical and semi-theoretical synthetic method of ground motion, stochastic finite fault method can comprehensively consider the impact of source, propagation path and site conditions, and can effectively simulate the seismic time history within the frequency range of engineering interest. It provides an effective means for the ground motion simulation in a large region. In this paper, the basic principle of stochastic finite fault method and the development of static corner frequency model and dynamic corner frequency model are firstly systematically expounded. Principles of the values of the major source parameters(fault size, rupture velocity, shear wave velocity, stress drop), kappa factor and Q value are analyzed. According to the actual situation in China, the corresponding range of values are provied. Finally, the shortcomings of present existing simulation methods in considering the parameter value, the interaction among sub-faults, energy treatment methods and fault division have been discussed. The development direction of stochastic finite fault method are somehow clarified.

关 键 词：地震动模拟 随机有限断层法 应力降 Kappa因子 品质因子 

分 类 号：P315.9[天文地球—地震学]