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[1]ZHANG Yongqi,DING Xiaoguang,CAO Jianping,et al.Seismic Capacity Analysis of Medium and Small Earthquakes of Guanzhong Gravity Network[J].Journal of Seismological Research,2017,40(02):248-256.

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Seismic Capacity Analysis of Medium and Small Earthquakes of Guanzhong Gravity Network

Journal of Seismological Research[ISSN 1000-0666/CN 53-1062/P] Volume: 40 Number of periods: 2017 02 Page number: 248-256 Column: Public date: 2017-04-23

Title:: Seismic Capacity Analysis of Medium and Small Earthquakes of Guanzhong Gravity Network

Author(s):: ZHANG Yongqi¹; 2; DING Xiaoguang¹; 2; CAO Jianping¹; ZHAI Hongguang¹; SU Lina¹; 2; ZHENG Zengji¹; (1. Administration of Shaanxi Province,Xi’an 710068,Shaanxi,China)(2. Institute of geology,China Earthquake Administration,Beijing 100029,China)

Keywords:: Guanzhong region; mobile gravity measurement; gravity change; Jingyang M_S4.8 earthquake; Gaoling M_S4.4 earthquake

CLC:: P315.726

DOI:: -

Abstract:: Using the quasi stable adjustment method,we estimate and calculate the data of Shaanxi Guanzhong gravity network,and obtain the value of the high precision gravity. Using Kriging interpolation algorithm,we obtain the differential and cumulative variation of gravity field images.Combined with 1998 January 5,Jingyang M_S4.8 earthquake and 2009 November 5,Gaoling M_S4.4,we analyzed the characteristics of the gravity field and the time series variation of gravity before and after two earthquakes. The results show that:(1)There are obvious gravity anomalies before and after two earthquakes,and the change process is the positive-negative-positive change,to meet the expansion mode;(2)The two earthquakes is related with tectonic activities of the Weihe Fault and Jingyang-Weinan Fault,the location of the epicenter is nearly in gravity zero line and corner of isoline,however,the earthquake gravity cumulative change is not obvious before two earthquakes;(3)The gravity change is obvious in western of Guanzhong before and after two earthquakes,however,in eastern of Guanzhong,the gravity values change is not obvious. The gravity points near the epicenter change is more obvious before and after the Jingyang earthquake than that of Gaoling earthquake.

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Last Update: 2017-06-10