| 利用GPS观测研究山西断陷带现今构造应力场变化与地震活动 |
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| 引用本文： | 刘瑞春,张锦,郭文峰,陈慧,陈永前.利用GPS观测研究山西断陷带现今构造应力场变化与地震活动[J].西北地震学报,2021,43(2):251-258. |
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| 作者姓名： | 刘瑞春 张锦 郭文峰 陈慧 陈永前 |
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| 作者单位： | 太原理工大学, 山西 太原 030024;太原大陆裂谷动力学国家野外科学观测研究站, 山西 太原 030021;山西省地震局, 山西 太原 030021 |
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| 基金项目： | 中国地震局地震预测研究所基本科研业务费专项（2017IES0101）；山西省科技攻关项目（20140313023-1）；山西省地震局科研项目（SBK-2121） |
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| 摘 要： | 基于1999—2007年山西断陷带GPS站点位移速率,采用格林函数法计算了山西断陷带地壳10 km深处的最大主应力和最大剪应力变化,并与区域地质构造、中强地震活动及其震源机制解等对比分析,结果表明:山西断陷带中强地震活动受区域构造应力场的控制,现今应力场变化强烈的区域,地震活动水平相对较高,地震震源机制与构造应力场变化特征一致性较强;构造应力场变化和中强地震活动还受构造相关区强震活动的影响,2009年以来忻定盆地原平段至石岭关隆起区中强地震活跃可能与汶川8.0级地震影响有关;山西南部尤其是运城盆地具有较高的背景应力水平,应进一步关注该区域的地震危险性。
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| 关 键 词： | 山西断陷带 GPS位移速率 构造应力场变化 地震活动 震源机制 |
| 收稿时间： | 2020/1/6 0:00:00 |
Variation of Present Tectonic Stress Field and Seismic Activity in Shanxi Rift Zone from GPS Observation |
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| LIU Ruichun,ZHANG Jin,GUO Wenfeng,CHEN Hui,CHEN Yongqian.Variation of Present Tectonic Stress Field and Seismic Activity in Shanxi Rift Zone from GPS Observation[J].Northwestern Seismological Journal,2021,43(2):251-258. |
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| Authors: | LIU Ruichun ZHANG Jin GUO Wenfeng CHEN Hui CHEN Yongqian |
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| Institution: | Taiyuan University of Technology, Taiyuan 030024, Shanxi, China;Continental Rift Valley Dynamics State Observatory of Taiyuan, Taiyuan 030021, Shanxi, China;Shanxi Earthquake Agency, Taiyuan 030021, Shanxi, China |
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| Abstract: | Based on the displacement rate of GPS stations in Shanxi rift zone from 1999 to 2007, the changes of maximum principal stress and maximum shear stress at the depth of 10 km in the crustal zone of Shanxi rift zone were calculated with the Green function method, and the results were compared with regional geological structure, strong earthquake activities, and focal mechanism solution. The study results showed that strong earthquake activities in Shanxi rift zone is controlled by regional tectonic stress field. Nowadays, the seismic activity level is relatively high in the region with strong stress field variation, and the seismic focal mechanism is consistent with the variation characteristics of tectonic stress field. The variation of tectonic stress field and strong seismicity are also affected by the strong earthquake activities in tectonic-related areas. The activities of moderate and strong earthquakes along the Yuanping section in Xinding Basin to the Shilingguan uplift since 2009 may be related to the Wenchuan M8.0 earthquake. A high background stress level shows in southern Shanxi, especially Yuncheng Basin, so further attention should be paid to the seismic hazard in the area. |
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| Keywords: | Shanxi rift zone GPS displacement rate tectonic stress variation seismic activity focal mechanism |
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