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SURVEYING RESULTS OF GRAVITY PROFILES AND CRUSTAL STRUCTURES IN THE TIANSHUI AREA,GANSU

GuO5houninn;Xu Jingwen;Meng Wanhui;Wang Li;Peng Xiaojun;Meng Xia(Earthquake Recoarch Institute of Lanzhou,SSB,Lanzhou 730000)  
In this paper, the gravity promesurvey in the Tinnshui area in 1990 is introduced.Thesurveying results are calculated by direct inversion method of varinble densities.In the area,thecrustal struCture, besides the sedimentary tayers near surface,includes three layers,i.e. the up-per,miudle and lower crusts with the average densities of 2.61,2.66 and 2.80 g/cm ̄3, respec- tively.The average bottom depths are 16, 28 and 45 km respectively,and the layers have con-siderable variations in both lateral and vertical directions.
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