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《EARTHQUAKE》 2000-S1
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Preliminary study on the relationship between upwelling of hot material and gravity anomaly before earthquake

Zhang Yong xian 1, Shi Yao lin 2, Liu Gui ping 1 (1. Center for Analysis and Prediction, CSB, Beijing 100036, China; 2. Graduate School, China Academic Sinica, Beijing 100039, China)  
A possible mechanism of gravity anomaly before earthquake is put forward based on the up down up feature of gravity variation near the epicenter. Firstly, pore pressure in the dilatant region would drop down quickly during the medium short term of earthquake preparation, and fluids around the dilatant region, especially the high pressure and hot fluids from the deeper crust would intrude into it, hence cause the increase of gravity on the ground. Secondly, the hot fluids would heat up the dilatant region gradually, subjoining an extensional stress to the shallow crust, which would decrease the density of the shallow crust. Thirdly, the process of fluids intruding into the extensional region of the shallow crust would make the gravity grow up again. Some parameters of Tangshan and Zhangbei earthquake, such as density variation, the size of dilatant region etc, are developed according to the observatory data before the earthquakes.
【Fund】: 国家科技攻关项目!(96-91 3-0 4 -0 3-0 2 )
【CateGory Index】: P315.72
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