Pre-seismic gravity anomalies before Linkou Ms6.4 earthquake by continuous gravity observation of Crustal Movement Observation Network of China

Xinsheng Wang; Honglei Li; Yufei Han

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Pre-seismic gravity anomalies before Linkou Ms6.4 earthquake by continuous gravity observation of Crustal Movement Observation Network of China

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A Ms6.4 earthquake occurred at Linkou country, Heilongjiang Province (44.8°N, 129.9°E) on January 2, 2016 at a depth of 580 km. Pre-seismic gravity anomalies obtained at a 1 Hz sampling rate from Crustal Movement Observation Network of China (CMONOC) are analyzed after the earthquake. The results show that: (1) different from previous studies, both pre-seismic amplitude perturbation and co-seismic amplitude perturbation are not critical inversely proportional to epicentral distance; (2) unlike shallow earthquake, the pre-seismic and co-seismic amplitude perturbation of gravity illustrate syn-chronous spatial variation characters with decrease of epicentral distance for Linkou earthquake. This may because Linkou earthquake is a deep earthquake and occurred in Pacific Plate subduction zone;(3) compared to basement and semi-basement, cave can provide a better observation environment for gPhone gravimeter to detect pre-seismic gravity anomalies.

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《大地测量与地球动力学（英文版）》 |2017年第2期|120-124|共5页
作者
Xinsheng Wang; Honglei Li; Yufei Han;
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National Earthquake Infrastructure Service, China Earthquake Administration, Beijing 100045, China;

State Key Laboratory of Geodesy and Earth's Dynamics, Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan 430077, China;

National Earthquake Infrastructure Service, China Earthquake Administration, Beijing 100045, China;

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Pre-seismic gravity anomalies before Linkou Ms6.4 earthquake by continuous gravity observation of Crustal Movement Observation Network of China

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