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《Crustal Deformation and Earthquake》 2002-01
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ANALYSIS OF THE ANOMALOUS CHANGE OF QUADRATIC PARTIAL DERIVATIVE OF GRAVITY EQUI-POTENTIAL SURFACE PRIOR TO STRONG EARTHQUAKES

Zheng Hong, Zhang Hongkui, Li Guojiang, Chai Jingkun and Shang Jianmin\;(Seismological Bureau of Beijing city, Beijing\ 100080)\;  
A correlation analysis method was used to process the quadratic partial derivative curvature vector of gravity potential (\%K\%) obtained at Pinggu station from 1970 to 1977, so as to remove the influence of the noises from rainfall and the like, and get vector \%K\-s\% which represents the true value of the bending degree of equi potential surface of gravity. Analysis of \%K\-s\% shows that obvious anomalies appeared prior to the Haicheng earthquake of \%M\%s7.3 on Feb. 4, 1975, the Tangshan earthquake of \%M\%s7.8 on Jul. 28, 1976, the Ninghe earthquake of \%M\%s6.9 on Nov. 15, and the Ninghe earthquake of \%M\%s6.5 on May 12, 1977. We use a parameter \%△K\-s\% to quantitatively describe the anomalous change of \%K\-s\% prior to earthquakes, and then a prediction equation was established by studying the statistic relationship between the time integration of \%△K\-s\% and the magnitude of earthquakes, and this way supply a reference prediction method for the estimation of the magnitude of coming earthquakes with different epicentral distance by using gravity data from a single station.
【Fund】: 北京市自然科学基金 (8992 0 0 8)资助项目
【CateGory Index】: P223.7;P315
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【References】
Chinese Journal Full-text Database 1 Hits
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【Co-references】
Chinese Journal Full-text Database 10 Hits
1 Hsu Houtse (Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan 430077, China);Satellite Gravity Missions-New Hotpoint in Geodesy[J];Developments In Surveying and Mapping;2001-03
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5 Liu Shanhua,Yin Rongzhen,Li Min and Chen Bailu\;(Center for Comprehensive Surreying,CSB,Beijing\ 100039);RESEMBLANT CHARACTER OF VERTICAL CRUSTAL DEFORMATION AND GRAVITY ANOMALIES BEFORE MACROSEISM IN NORTH CHINA[J];Crustal Deformation and Earthquake;2002-03
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7 Fu Guangyu, Zhang Yongjun, Liu Shaoming,Sun Shaoan,Liu Dongzhi and Li Hui (Institute of Seismology, CSB,Wuhan430071);DYNAMIC GRAVITY CHANGES BEFORE AND AFTER EARTHQUAKE OF M_S8.1 OCCURRED IN WEST TO KUNLUN MOUNTAIN PASS[J];Crustal Deformation and Earthquake;2003-01
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9 Zhu Yiqing {1,2)\},Hu Bin ,Li Hui and Chen Bing 1)No.2 Crustal Deformation Monitoring Center,CSB,Xi'an\ 710054 2)Institute of Seismology, CSB, Wuhan\ 430071;VARIATION OF GRAVITY FIELD OF XINJIANG AREA AND JIASHI M_S6.8 EARTHQUAKE[J];Crustal Deformation and Earthquake;2003-03
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