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AbstractThe relation between the gravity variation features and M_S=8.1 earthquake in Qinghai-Xizang monitoring area isanalyzed preliminarily,by using spatial dynamic variation results of regional gravity field from absolute gravityand relative gravity observation in 1998 and 2000.The results show that:1)M_S=8.1 earthquake in Kulun mountainpass western occurred in the gravity variation high gradient near gravity’s high negative variation; 2)The maintectonic deformation and energy accumulation before M_S=8.1 earthquake are distributed at south side of theepicenter;3)The range of gravity’s high negative variation at east of the M_s=8.1 earthquake epicenter relativelycoincides with that rupture region according to field geology investigation; 4)Gravity variation distribution in highnegative value region is just consistent with the second shear strain’s high value region of strain field obtainedfrom GPS observation.
AbstractThe relation between the gravity variation features and M_S = 8.1 earthquake in Qinghai-Xizang monitoring area isanalyzed preliminarily, by using spatial dynamic variation results of regional gravity field from absolute gravity and relative gravity observation in 1998 and 2000. The results show that: 1) M_S = 8.1 earthquake in Kulun mountainpass western occurred in the gravity variation high gradient near gravity’s high negative variation; 2) The maintectonic deformation and energy accumulation before M_S = 8.1 earthquake are distributed at the south side of the epicenter; 3) The range of gravity’s high negative variation at east of the M_s = 8.1 earthquake epicenter relativelycoincides with that rupture region according to field geology investigation; 4) Gravity variation distribution in highnegative value region is just consistent with the second shear strain’s high value region of strain field obtained from GPS observation.