地震学报2011，Vol.33Issue(6)：817-827,11.DOI:10.3969/j.issn.0253-3782.2011.06.012
唐山地区铅垂线变化与地震前后地下物质变化的关系
Relation between plumb line variation in Tangshan region and underground material change before and after earthquakes
摘要
Abstract
Plumb line variations (PLV) at the points with spacing of 0. L°×0. 1° in Tangshan region during 1987-1998 are determined by using 46 batch repeated gravity observations of the Beijing-Tangshan network. Relation between underground material change (UMC) and PLV on ground are discussed and an approach of studying the UMC from regional PLV observation is developed. The UMC before and after two earthquakes (3 Aug. 1988, mh4. 3; 5 Oct. 1995, mb5. 0) in Tangshan region, as examples, is studied, giving the location and depth of the mass center of underground disturbed body, as well as the mass quantity. It has been demonstrated that the obtained UMC is responsible for the PLV, as well as the gravity changes in the area, where an earthquake may be preparing and is going to occur. It is also possible to study the UMC from the PLV result deduced from the repeated gravity observations in an area. UMC determination is expected to provide new message in earth science study, including earthquake prediction research.关键词
华北重力网/铅垂线变化/地下物质变化/地震/天体测量学/大地测量学Key words
North China gravimetric network/ plumb line variation/ underground matter change/ earthquake/ astrometry/ geodesy分类
天文与地球科学引用本文复制引用
李正心,李辉..唐山地区铅垂线变化与地震前后地下物质变化的关系[J].地震学报,2011,33(6):817-827,11.基金项目
国家自然科学基金项目(10973031)资助. （10973031）
