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《Crustal Deformation and Earthquake》 1990-04
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ISOSTATIC ANOMALY,REMAINDER ANOMALY AND EARTHQUAKES IN NORTH MARGIN OFQINGHAI-XIZANG PLATEAU

Li Weijuan Liang Guipei (The Earthquake Research Institute of Lanzhou,SSB)  
In the paper,according to crustal isostatic principle of Airy-Heiskenen,the isostasy of 89 measuring points were calculated for 94°-100°30′ in the east logitude and 37°-42° in the north latitude.The calculating results in the research region show the state of crustal isostatic.The four crustal disisostatic regions are divided. We calculated average gravity field with different window from Bouger gravity anomaly and obtained further remainder gravity feild The zero lines of the remainder anomaly relate to the fracture extending position.The earthquakes occurred in vicinity of the negative area or the zero line.There are the gravity high belts arranged into NNW direction in Yumen-east Wulan and Gaotai-east Qinghai Lake.It is the geomorphological staircase zones in geomorphologically.It probably shows that there are larger fractures under there. The relationship between them and geological structure and earthquake activity are discussed to gain some interesting results.
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1 Wang Mingge~(1),Li Zhanfang~(2),Li Changcun~(1)(1.The Resources and Environment Colege of Hebei Polytechnic University,Tangshan 063009,China;2.Shirengou iron mine,Tanggang Mine Company,Zunhua 064200,China);Fuzzy mathematics comprehensive assessment of crust stability in Hebei plain[J];Earthquake Engineering and Engineering Vibration;2006-03
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【Co-references】
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