冯淦^1,,
万永革^1,2,,,
许鑫¹,
李枭¹
1. 防灾科技学院, 河北三河 065201
2. 河北省地震动力学重点实验室, 河北三河 065201

基金项目: 国家自然科学基金（42174074，41674055），河北省地震科技星火计划项目（DZ20190415002，DZ20200827053），中央高校科研业务费专项（ZY20215117）和河北省地震动力学重点实验室开放基金项目（FZ212105）共同资助


详细信息

作者简介: 冯淦, 男, 1998年生, 在读硕士生, 主要从事构造应力场、应力触发方面的研究工作.E-mail: 694330476@qq.com

通讯作者: 万永革, 男, 1967年生, 研究员, 主要从事构造应力场、地震应力触发等方面研究工作.E-mail: wanyg217217@vip.sina.com.cn

中图分类号: P315

收稿日期:2021-06-30
修回日期:2021-09-16
上线日期:2021-12-10

Static stress influence of the 2021 M_S7.4 Madoi, Qinghai earthquake on neighboring areas

FENG Gan^1,,
WAN YongGe^1,2,,,
XU Xin¹,
LI Xiao¹
1. Institute of Disaster Prevention, Sanhe Hebei 065201, China
2. Hebei Key Laboratory of Earthquake Dynamics, Sanhe Hebei 065201, China


More Information

Corresponding author: WAN YongGe,E-mail:wanyg217217@vip.sina.com.cn

MSC: P315

--> Received Date: 30 June 2021
Revised Date: 16 September 2021
Available Online: 10 December 2021


摘要
摘要:为了探讨2021年青海玛多M_S7.4地震对后续地震的影响，基于2021年青海玛多M_S7.4地震的破裂模型及均匀弹性半空间模型，本文计算了该地震在震中附近主要断层面上产生的同震库仑应力变化，结果表明库仑破裂应力加载区主要集中在东昆仑断裂东段西部、玛多-甘德断裂中段、昆仑山口-江错断裂西段，而库仑破裂应力影区主要集中在东昆仑断裂中段东部、昆仑山口-江错断裂东段、玛多-甘德断裂西段、达日断裂.其次，本文计算了该地震对周围地区造成的水平面应力变化及位移场.位移场的水平分量表明震中西南和东北两侧物质向震中汇聚，而震中东南和西北两侧物质向外流出，从位移场的垂直分量来看，震中西南和东北两侧表现出明显的隆升，而在震中东南和西北两侧表现出明显的沉降.水平面应力在震中的北东-南西两侧（东昆仑-柴达木断块东侧和巴颜喀拉断块西侧）增加（拉张），而在震中的北西-南东两侧（东昆仑-柴达木断块西部和巴颜喀拉断块东部）降低（压缩），在昆仑山口-江错断裂段附近，水平面最小主应力近NW向，水平面最大主应力近SW向，在一定程度上抵消了该区域构造应力场（SW向挤压，NW向拉张），结合位移场说明该次地震是在构造应力场作用下的一次正常应力释放.从整体来看，水平面最小主应力和水平面最大主应力的方向分布类似于磁场线的分布，并且两者互相垂直.
关键词: 2021玛多地震/
库仑应力/
水平应力/
周围断层

Abstract:This work attempted to explore the influence of the 2021 Madoi M_S7.4 earthquake on subsequent events in neighboring areas. Based on the rupture model of the 2021 Madoi event and the half space homogeneous elastic model, we calculated the co-seismic Coulomb stress changes on the active faults near the epicenter. Results show that the Coulomb stress increases in the east of the East Kunlun fault, the middle of the Madoi-Gadê fault, the west of the Dari fault and the west of the Kunlunshankou-Jangco fault. While it decreases in the middle of the East Kunlun fault, the east of the Kunlunshankou-Jangco fault, the west of the Gadê-Madoi fault and the east of the Dari fault. Then, we calculated the horizontal stress changes and the displacement field generated by the 2021 Madoi earthquake. The horizontal component of the displacement field shows that the material in the southwest and northeast of the Madoi earthquake move toward the epicenter, while that in the southeast and northwest flow outward from the epicenter. From the vertical component of the displacement field, there are obvious uplift in the southwest and northeast of the epicenter, while obvious subsidence occurs in the southeast and northwest of the epicenter. The areal stress increases in the northeast and southwest of the epicenter(the east of the Qaidam block and the west of the Bayan Har block), while it decreases in the northwest and the southeast of the epicenter(the west of the Qaidam block and the east of the Bayan Har block). The principal extensional stress shows SE direction near the epicenter, and the principal compressive stress shows NW direction near epicenter area, which counteracts the tectonic stress field in this area to a certain extent (EW tension and NS compression). The displacement field shows that the 2021 Madoi earthquake is a normal release under the tectonic stress field. On the whole, the principal extensional and principal compressive stresses are similar to the distribution of magnetic field lines, which are perpendicular to each other.
Key words:2021 Madoi earthquake/
Coulomb failure stress change/
Horizontal stress/
Surrounding faults



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