全球M W≥7.0强震震级与断层滑动尺度的关系  

Relationship between M W≥7.0 Global Strong Earthquakes and Fault Slip Scale

作　　者：丁灿阳 冯雅杉 刘成利 熊熊 DING Canyang;FENG Yashan;LIU Chengli;XIONG Xiong(School of Geophysics and Geomatics,China University of Geosciences,388 Lumo Road,Wuhan 430074,China)

机构地区：[1]中国地质大学(武汉)地球物理与空间信息学院,武汉市430074

出　　处：《大地测量与地球动力学》2024年第5期510-516,共7页Journal of Geodesy and Geodynamics

基　　金：国家重点研发计划(2022YFF0800703);国家自然科学基金(42230309)。

摘　　要：分类统计USGS 1990~2023年期间全球范围内195次M W≥7.0强震的有限断层模型,采用最小二乘拟合方法得到矩震级M W与断层破裂长度RL(rupture length)、宽度RW(rupture width)和主破裂面积RA(rupture area)之间新的经验关系式。以走滑、逆冲和正断型地震为例,利用新的经验关系式分别给出不同断层类型的几何参数,在此基础上计算同震库仑应力变化。结果显示,计算得到的应力增强和减弱的区域分布与利用实际震源破裂模型计算的结果基本一致,证明了新关系式的有效性。We utilize 195 finite fault models of strong earthquakes(M W≥7.0)released by USGS from 1990 to 2023.We employ the method of least squares fitting to derive new empirical relationships between moment magnitude(M W)and rupture length(RL),rupture width(RW),and rupture area(RA),respectively.Taking strike-slip,reverse,and normal faulting earthquakes as examples,we obtain geometric parameters of different fault types based on the new empirical relationships,which we then utilize to calculate coseismic Coulomb stress changes.The results indicate that the spatial distribution of stress enhancement and decrease obtained using the new empirical formulas closely align with the results obtained from actual rupture models,thus providing the effectiveness of the new relationships.

关 键 词：有限断层模型 强震 断层参数 经验关系 

分 类 号：P315[天文地球—地震学]