InSAR约束下的2021年西藏比如M_(W)5.7地震断层几何参数及滑动分布  

Fault Geometry Parameters and Slip Distribution of the 2021 Biru,Tibet M_(W)5.7 Earthquake Constraint by InSAR

作　　者：马唐敬 MA Tangjing(College of Surveying and Geo-informatics,North China University of Water Resources and Electric Power,136 East-Jinshui Road,Zhengzhou 450046,China)

机构地区：[1]华北水利水电大学测绘与地理信息学院,郑州市450046

出　　处：《大地测量与地球动力学》2023年第10期1086-1089,1100,共5页Journal of Geodesy and Geodynamics

基　　金：国家自然科学基金(42277478)。

摘　　要：利用Sentinal-1A卫星SAR数据获取覆盖2021-03-19西藏比如M_(W)5.7地震的降轨同震视线向形变场,反演此次地震的发震断层几何参数及同震滑动分布。结果表明,此次地震破裂在一个之前未被探测到的隐伏断层上;破裂以正断为主,伴有少量左旋走滑分量;滑动主要分布在2.4~11.2 km深度处,且在6.4 km深度处滑动量达到最大,约为0.17 m;获取的地震矩约为3.6×10^(17) Nm,相当于M_(W)5.7。这些精确的断层参数及震源模型可为评估区域地震危险性及构造演化提供重要参考。We use SAR data of Sentinal-1A satellite to acquire the descending coseismic line-of-sign(LOS)displacements covering the 2021-03-19 Biru M_(W)5.7 earthquake,and invert the fault geometry parameters and detailed coseismic slip of this event.The results show that the earthquake disrupted a previously undetected buried fault and is characterized by normal-faulting with minor left-lateral strike-slip components.The most slip is concentrated at the depth of 2.4 to 11.2 km with the maximum value of 0.17 m at a depth of 6.4 km.The acquired seismic moment is about 3.6×10^(17) Nm,equivalent to M_(W)5.7.The accurate fault parameters and source model can provide an important reference for the regional seismic risk assessment and tectonic evolution.

关 键 词：SAR 比如地震 发震构造 滑动分布 

分 类 号：P313[天文地球—固体地球物理学] P315[天文地球—地球物理学] P237