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利用双差层析成像方法研究辽宁海城-岫岩地区的精细速度结构
引用本文:夏彩韵,张正帅,贾丽华,王喜龙.利用双差层析成像方法研究辽宁海城-岫岩地区的精细速度结构[J].大地测量与地球动力学,2022,42(2):182-186.
作者姓名:夏彩韵  张正帅  贾丽华  王喜龙
作者单位:辽宁省地震局,沈阳市黄河北大街44号,110031;山东省地震局,济南市文化东路20号,250014
基金项目:中国地震局地震科技星火计划(XH19008Y);中国地震局震情跟踪定向工作任务(20200116);河北省地震动力学重点实验室开放基金(FZ212204)。
摘    要:利用区域尺度的双差层析成像方法对2008-10~2020-04辽宁海城-岫岩地区地震事件进行震源位置和速度结构的联合反演.对剔除离散走时后的5028个地震事件进行重新定位,得到的震相走时均方根残差平均值由定位前的0.507 s降为0.279 s.重新定位后的结果显示:1)大部分地震发生于地下5~15 km,海城-岫岩地...

关 键 词:双差定位  层析成像  速度结构  海城-岫岩地区

Using Double-Difference Tomography to Study the Fine Velocity Structure in Haicheng-Xiuyan Area of Liaoning
XIA Caiyun,ZHANG Zhengshuai,JIA Lihua,WANG Xilong.Using Double-Difference Tomography to Study the Fine Velocity Structure in Haicheng-Xiuyan Area of Liaoning[J].Journal of Geodesy and Geodynamics,2022,42(2):182-186.
Authors:XIA Caiyun  ZHANG Zhengshuai  JIA Lihua  WANG Xilong
Institution:(Liaoning Earthquake Agency,44 North-Huanghe Street,Shenyang 110031,China;Shandong Earthquake Agency,20 East-Wenhua Road,Ji’nan 250014,China)
Abstract:We use the regional-scale double-difference tomography method to perform a joint inversion of the source location and velocity structure of the seismic events recorded from October 2008 to April 2020 in the Haicheng-Xiuyan area of Liaoning province. After excluding the discrete travel time, a total of 5,028 seismic events are collected for positioning. We determine that the average value of the root mean square residual error of the seismic phase travel time decreases from 0.507 s before positioning to 0.279 s after positioning. The results of the relocation show: 1) Most of the earthquakes occurred 5-15 km underground, and the seismic activity in the Haicheng-Xiuyan area was more concentrated in the geological structure and distributed on the fault zone in a strip form, which is similar to the Haichenghe-Dayanghe fault. 2) The main seismic activities we obtain from the inversion are mainly distributed in the low-velocity area and the area at the junction of the high-speed body and the low-velocity body. This is related to the fault structure and deep fluid.
Keywords:double-difference positioning  tomography  velocity structure  Haicheng-Xiuyan area
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