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Advances in Earth Science >

2021 , Vol. 36 >Issue 5: 510 - 519

DOI: https://doi.org/10.11867/j.issn.1001-8166.2021.050

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

  • Xiong YANG ,
  • Yiqing ZHU ,
  • Chongyang SHEN ,
  • Yunfeng ZHAO
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  • 1.Second Crust Monitoring and Application Center，China Earthquake Administration，Xi'an 710054，China
    2.Institute of Seismology，China Earthquake Administration，Wuhan 430071，China
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
ZHU Yiqing (1962-), male, Xishui City, Hubei Province, Professor. Research areas include gravity measurement, gravity time variation and its relationship with strong earthquakes. E-mail:zhuyiqing@163.com

Received date: 2021-01-18

  Revised date: 2021-04-07

  Online published: 2021-07-02

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)

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Abstract

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： ① 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. ② 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".③ 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. ④ 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.

Key words： Xiahe earthquake; Gravity observation; Gravity anomaly; Lintan-Tanchang fault

Cite this article

Xiong YANG , Yiqing ZHU , Chongyang SHEN , Yunfeng ZHAO . Analysis on the Characteristics of Gravity Field Anomalies Before and After the Xiahe MS 5.7 Earthquake in Gansu in 2019[J]. Advances in Earth Science, 2021 , 36(5) : 510 -519 . DOI: 10.11867/j.issn.1001-8166.2021.050

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