山西地区典型震源位置的精确度分析  

Accuracy Analysis of Typical Seismic Source Locations in Shanxi Region

作　　者：张蕙[1,2] 殷伟伟[1,2] 李宏伟[1,2] Zhang Hui;Yin Weiwei;Li Hongwei(Shanxi Earthquake Agency,Taiyuan 030021,China;National Continental Rift Valley Dynamics Observatory of Taiyuan,Taiyuan 030025,China)

机构地区：[1]山西省地震局,太原030021 [2]太原大陆裂谷动力学国家野外科学观测研究站,太原030025

出　　处：《震灾防御技术》2025年第1期32-40,共9页Technology for Earthquake Disaster Prevention

基　　金：山西省地震局项目(SBK-2328、SBK-2034、SBK-2424);中国地震局科技星火计划(XH23008YA);山西省科技厅项目(202403021221339);山西太原大陆裂谷动力学国家野外科学观测研究站项目(NORSTY20-13)。

摘　　要：针对当前地震定位误差分析的不足,本文提出了利用数值模拟定量计算地震定位准确度的方法,并选择近年来山西断陷带典型地震事件进行测试分析。结果显示,山西断陷带典型地震(M_(L)≥3.6)定位精度基本小于5 km,南北两端的大同、运城盆地地震定位精度显著低于中部3个盆地;地震定位精度与参与定位的台站数量和最大空隙角密切相关;当最大空隙角相近时,地震定位的可信度随着参与定位的台站数量增多而升高。To address deficiencies in the current analysis of seismic location errors,this study proposes a numerical simulation-based method to quantitatively assess seismic location accuracy.This approach is applied to typical seismic events in the Shanxi fault depression in recent years.The results indicate that the seismic location accuracy for events with M_(L)≥3.6 in the Shanxi Rift Zone is within 5 km.However,the accuracy in the Datong and Yuncheng basins,located at the northern and southern ends of the rift,is significantly lower than that in the three central basins.Furthermore,seismic location accuracy is closely related to the number of seismic stations and the maximum gap angle.When the maximum gap angle is comparable,location reliability improves as the number of contributing stations increases.

关 键 词：山西断陷带 定位精度 概率统计 误差分析 

分 类 号：P315.7[天文地球—地震学]