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《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

卷:

第44卷

期数:

2022年第06期

页码:

1016-1026

栏目:

纪念刘国昌先生诞辰110周年专辑

出版日期:

2022-11-15

文章信息/Info

Title:

Co-seismic Deformation Field and Fault Slip Distribution of the 2021 Maduo M_w 7.4 Earthquake in Qinghai, China Based on InSAR Technology

文章编号:

1672-6561(2022)06-1016-11

作者:

王守文¹; 季灵运¹; 2*; 朱良玉²; 刘传金²

(1. 长安大学 地质工程与测绘学院,陕西 西安 710054; 2. 中国地震局第二监测中心,陕西 西安 710054)

Author(s):

WANG Shou-wen¹;  JI Ling-yun¹; 2*;  ZHU Liang-yu²;  LIU Chuan-jin²

(1. School of Geological Engineering and Geomatics, Chang'an University, Xi'an 710054, Shaanxi, China; 2. The Second Monitoring and Application Center of China Earthquake Administration, Xi'an 710054, Shaanxi, China)

关键词:

玛多M_w 7.4级地震;  大地测量;  InSAR;  同震形变;  断层滑动;  震源参数;  联合反演

Keywords:

Maduo M_w 7.4 earthquake;  geodesy;  InSAR;  co-seismic deformation;  fault slip;  earthquake source parameter;  joint inversion

分类号:

P315; P23

DOI:

10.19814/j.jese.2022.04017

文献标志码:

A

摘要:

2021年5月22日青海省玛多县发生M_w 7.4级地震。为研究玛多M_w 7.4级地震的同震形变、滑动分布及同震引起的静态库仑应力变化和影响,选取Sentinel-1 A/B 升、降轨SAR卫星影像数据,采用D-InSAR技术获取玛多M_w 7.4级地震同震形变场; 基于梯度下降法(SDM),联合GPS和InSAR同震形变数据,共同约束反演同震滑动分布。结果表明:玛多M_w 7.4级地震影响范围广,产生了长约170 km的地表破裂; 地震造成地表雷达视线向最大形变量约为1.2 m,隆升和沉降最大相对位移量约为2.2 m; 发震断层整体走向约283°,滑动角约21°,倾角约77°; 断层错动以左旋走滑为主,主要集中在地下12 km深度以内,联合GPS和InSAR数据反演的同震最大滑动量约为3.76 m,同震错动破裂到地表,反演的矩震级为M_w 7.42。结合同震引起的静态库仑应力结果和地震周围余震的空间分布特征认为:大部分余震发生在断层附近,并在东、西侧库仑应力增加区有少量余震发生; 断层东侧和西侧存在一定的库仑应力积累,可能存在较高的地震危险性。

Abstract:

On May 22, 2021, the M_w 7.4 earthquake occurred in Maduo county of Qinghai province. In order to study the co-seismic deformation, slip distribution, static Coulomb stress changes and effects of Maduo M_w 7.4 earthquake, the image data of sentinel-1 A/B satellite's ascending and descending SAR were selected, and D-InSAR technology was used to obtain the co-seismic deformation field of Maduo M_w 7.4 earthquake. Based on the steepest decent method(SDM), combined with GPS and InSAR co-seismic deformation data, the inversion of the co-seismic sliding distribution was constrained jointly. The results show that the co-seismic deformation field caused by Maduo M_w 7.4 earthquake has a very wide range of effects, resulting in surface ruptures of 170 km in length; earthquakes cause the maximum 1.2 m of the LOS on the surface and the maximum relative displacement of 2.2 m for uplift and sedimentation; the overall average direction of Maduo M_w 7.4 earthquake fault is 283°, the average sliding angle is 21°, and the inclination angle is 77°; fault slip is dominated by left-handed slippage, mainly concentrated within 12 km underground; the maximum sliding amount of joint GPS and InSAR co-seismic data inversion is 3.60 m; the inverted magnitude is approximately M_w 7.42; the causative fault ruptures the surface. Combined with the static Coulomb stress results caused by the same earthquake and the spatial distribution characteristics of the aftershocks around the earthquake, the results show that most of the aftershocks occur near faults, with a small number of aftershocks occurring in the east and west Coulomb stress-increasing zone. There is a certain amount of Coulomb stress accumulation on the east and west sides of the seismic fault, and there may be a high seismic risk.

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备注/Memo

备注/Memo:

收稿日期:2022-04-11
基金项目:国家自然科学基金项目(41904007)
作者简介:王守文(1998-),男,河南濮阳人,工学硕士研究生,E-mail:wshwenchd@163.com。
*通讯作者:季灵运(1982-),男,内蒙古赤峰人,中国地震局第二监测中心研究员,工学博士,E-mail:dinsar010@163.com。

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