Advances in Earth Science ›› 2018, Vol. 33 ›› Issue (3): 236-247. doi: 10.11867/j.issn.1001-8166.2018.03.0236

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Progress in the Application of Ground Gravity Observation Data in Earthquake Prediction

Jinglun Mao 1, 2( ), Yiqing Zhu 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:2017-08-09 Revised:2018-01-20 Online:2018-03-20 Published:2018-05-02
  • About author:

    First author:Mao Jinglun(1990-),male,Xi’an City,Shaanxi Province,Engineer. Research areas include seismic gravimetry,time-varying gravity and its relation to strong earthquakes.

  • Supported by:
    Project supported by the Major Scientific Research Instrument Development Project of the National Natural Science Foundation of China “Development and application of high precision absolute gravimeter”(No.61627824);The National Natural Science Foundation of China“Quantitative study on the evolution law of strong earthquakes in the Xianshuihe fault by using crustal deformation and gravimetry data”(No.41374026).

Jinglun Mao, Yiqing Zhu. Progress in the Application of Ground Gravity Observation Data in Earthquake Prediction[J]. Advances in Earth Science, 2018, 33(3): 236-247.

The mechanism of earthquake inoculation and the process of earthquake occurrence are very complicated. Additionally, earthquakes do not happen very often, and we lack enough cognition to the earth’s interior structure, activity regularity and other key elements. As a result, research progress about the theory of earthquake precursors has been greatly restricted. Ground gravity observation has become one of the main ways to study earthquake precursor information in many countries and regions. This paper briefly summarized the surface gravity observation technology and observation network in China: the surface gravity measurement instrument developed from Huygens physical pendulum in seventeenth Century to today’s high-precision absolute gravimeter, and its accuracy reached to ±1×10-8 m/s2. China has successively established the National Gravity Network, Digital Earthquake Observation Network of China,the Crustal Movement Observation Network of China Ⅰ and the Crustal Movement Observation Network of China, to provide a public platform for monitoring non tidal gravity change, seismic gravity and tectonic movement. The use of specific examples illustrated the role of gravity observation data in earthquake prediction. The gravity observation data of ground gravity can be used to capture the information of gravity change in the process of strong earthquake inoculation, and to provide an important basis for the long-term prediction of strong earthquakes. The temporal and spatial variation characteristics of the regional gravity field and its relation to strong earthquakes were analyzed: Before the earthquake whose magnitude is higher than MS 5, generally there will be a large amplitude and range of gravity anomaly zones. Strong earthquakes occur mainly in areas where the gravity field changes violently. The dynamic change images of gravity field can clearly reflect the precursory information of large earthquakes during the inoculation and occurrence. Finally, the existing problems of surface gravity technology in earthquake precursor observation were put forward and the use of gravity measurement data in earthquake prediction research was prospected.

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