地球科学进展 ›› 2021, Vol. 36 ›› Issue (5): 510 -519. doi: 10.11867/j.issn.1001-8166.2021.050

研究论文 上一篇    下一篇

2019年甘肃夏河 MS 5.7地震前后重力场异常特征分析
杨雄 1 , 2( ), 祝意青 1( ), 申重阳 2, 赵云峰 1   
  1. 1.中国地震局第二监测中心,陕西 西安 710054
    2.中国地震局地震研究所,湖北 武汉 430071
  • 收稿日期:2021-01-18 修回日期:2021-04-07 出版日期:2021-06-18
  • 通讯作者: 祝意青 E-mail:1076772921@qq.com;zhuyiqing@163.com
  • 基金资助:
    国家自然科学基金面上项目“川滇地区地震前后重力场时空变化研究”(41874092);“基于地球内部变形与密度耦合运动模式的迭代反演方法及应用研究”(41674018)

Analysis on the Characteristics of Gravity Field Anomalies Before and After the Xiahe M S 5.7 Earthquake in Gansu in 2019

Xiong YANG 1 , 2( ), Yiqing ZHU 1( ), Chongyang SHEN 2, Yunfeng ZHAO 1   

  1. 1.Second Crust Monitoring and Application Center,China Earthquake Administration,Xi'an 710054,China
    2.Institute of Seismology,China Earthquake Administration,Wuhan 430071,China
  • Received:2021-01-18 Revised:2021-04-07 Online:2021-06-18 Published:2021-07-02
  • Contact: Yiqing ZHU E-mail:1076772921@qq.com;zhuyiqing@163.com
  • About author:YANG Xiong (1994-), male, Xianyang City, Shaanxi Province, Assistant engineer. Research areas include gravity measurement, gravity time variation and gravity inversion research. E-mail: 1076772921@qq.com
  • Supported by:
    the National Natural Science Foundation of China "Study on the temporal and spatial changes of gravity field before and after earthquakes in Sichuan-Yunnan region"(41874092);"Iterative inversion method and application research based on the coupling motion model of Earth's internal deformation and density"(41674018)

地震的孕育发生过程伴随着构造运动、物质迁移和密度变化,将引起地球重力场变化,流动重力重复观测有可能捕捉到与地震孕育有关的前兆信息,从而为中短期地震预测提供重要依据。基于南北地震带2017—2020年的流动重力观测资料,获得了甘东南地区的区域重力场时空变化图像,分析了区域重力场动态变化及其与2019年甘肃夏河MS 5.7地震发生的关系。结果表明: 震前测区重力异常变化等值线与临潭—宕昌断裂走向基本一致,且在震中附近出现四象限分布特征,夏河MS 5.7地震发生在重力高梯度带和四象限中心附近; 地震前后区域重力场经历了“区域性重力异常—四象限分布特征—反向变化发震”的时空演化过程; 九寨沟地震的发生可能引起附近断层区域应力场的调整,从而加速了夏河地震的发生; 区域重力场时变与临潭—宕昌断裂在空间上有较好的对应,综合分析可认为该次地震的发震断裂为临潭—宕昌断裂。

The process of earthquake incubation is accompanied by tectonic movement, material migration and density changes, which will cause changes in the Earth's gravity field. Repeated observations of flowing gravity may capture precursor information related to earthquake incubation, thereby providing important basis for mid- and short-term earthquake prediction. Based on the relative gravity observation data of the North-South seismic belt from 2017 to 2020, this paper obtains the spatio-temporal changes of the regional gravity field in southeastern Gansu, and analyzes the dynamic changes of the regional gravity field and its relationship with the occurrence of the Xiahe MS 5.7 earthquake in Gansu in 2019. The results show that: The contour of the gravity anomaly change in the observation area before the earthquake is basically the same as the strike of the Lintan-Tanchang fault, and the four-quadrant distribution characteristics appear near the epicenter. The Xiahe MS 5.7 earthquake occurred in the high gradient zone and near the center of the four-quadrant. The regional gravity field before and after the earthquake experienced a spatiotemporal evolution process of "regional gravity anomaly-four-quadrant distribution characteristics-reverse change earthquake". The occurrence of the Jiuzhaigou earthquake may cause the adjustment of the stress field in the nearby fault area, thus accelerating the occurrence of the Xiahe earthquake. The time-varying regional gravity field corresponds well to the Lintan-Tanchang fault in space. Comprehensive analysis can be considered that the seismogenic fault of this earthquake is the Lintan-Tanchang fault.

中图分类号: 

图1 青藏高原东北缘地质构造和历史地震分布图
F1:东昆仑断裂;F2:塔藏断裂;F3:岷江断裂;F4:白龙江断裂;F5:光盖山—迭山北麓断裂;F6:临潭—宕昌断裂;F7:西秦岭北缘断裂;F8:日月山断裂;F9:拉脊山北缘断裂;F10:金城关断裂;F11:马衔山断裂;F12:六盘山断裂;F13:龙门山断裂;F14:两江—江洛南断裂;F15:康县北断裂;F16:礼县—罗家堡断裂;F17:文县—康县断裂
Fig.1 Geological structure and historical earthquake distribution map on the northeastern margin of the Qinghai-Tibet Plateau
F1: East Kunlun fault; F2: Tazang fault; F3: Minjiang fault; F4: Bailongjiang fault; F5: Guanggaishan-Dieshan nothern foot fault; F6: Lintan-Tanchang fault; F7: West Qinling northern margin fault; F8:Riyueshan fault; F9:Lajishan northern margin fault; F10:Jinchengguan fault; F11:Maxianshan fault; F12:Liupanshan fault; F13:Longmenshan fault; F14:Liangjiang-Jiangluo south fault; F15:Kangxian northern fault; F16:Lixian-Luojiabao fault; F17:Wenxian-Kangxian fault
图1 青藏高原东北缘地质构造和历史地震分布图
F1:东昆仑断裂;F2:塔藏断裂;F3:岷江断裂;F4:白龙江断裂;F5:光盖山—迭山北麓断裂;F6:临潭—宕昌断裂;F7:西秦岭北缘断裂;F8:日月山断裂;F9:拉脊山北缘断裂;F10:金城关断裂;F11:马衔山断裂;F12:六盘山断裂;F13:龙门山断裂;F14:两江—江洛南断裂;F15:康县北断裂;F16:礼县—罗家堡断裂;F17:文县—康县断裂
Fig.1 Geological structure and historical earthquake distribution map on the northeastern margin of the Qinghai-Tibet Plateau
F1: East Kunlun fault; F2: Tazang fault; F3: Minjiang fault; F4: Bailongjiang fault; F5: Guanggaishan-Dieshan nothern foot fault; F6: Lintan-Tanchang fault; F7: West Qinling northern margin fault; F8:Riyueshan fault; F9:Lajishan northern margin fault; F10:Jinchengguan fault; F11:Maxianshan fault; F12:Liupanshan fault; F13:Longmenshan fault; F14:Liangjiang-Jiangluo south fault; F15:Kangxian northern fault; F16:Lixian-Luojiabao fault; F17:Wenxian-Kangxian fault
图2 青藏高原东北缘联测路线及活动断裂图
Fig.2 Map of joint gravity surveys and active faults in the study area on the northeastern margin of the Qinghai-Tibet Plateau
图2 青藏高原东北缘联测路线及活动断裂图
Fig.2 Map of joint gravity surveys and active faults in the study area on the northeastern margin of the Qinghai-Tibet Plateau
表1 甘肃东南地区重力测网资料
Table 1 Information of gravity survey network in southeast Gansu
表1 甘肃东南地区重力测网资料
Table 1 Information of gravity survey network in southeast Gansu
图3 夏河地震前后重力场差分变化图像
Fig.3 Differential image of gravity field before and after the Xiahe earthquake
图3 夏河地震前后重力场差分变化图像
Fig.3 Differential image of gravity field before and after the Xiahe earthquake
图4 夏河地震前后不同时段的重力场变化图像
Fig.4 Gravity field changes in different periods before and after the Xiahe earthquake
图4 夏河地震前后不同时段的重力场变化图像
Fig.4 Gravity field changes in different periods before and after the Xiahe earthquake
图5 夏河地震震中附近测点重力时序变化图
Fig.5 Time series change of gravity at survey points near the epicenter of the Xiahe earthquake
图5 夏河地震震中附近测点重力时序变化图
Fig.5 Time series change of gravity at survey points near the epicenter of the Xiahe earthquake
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