天水地震区非纵资料解释

THE INTERPRETATION OF THE FANPROFILES DATA IN TIANSHUI EARTHQUAKE AREA

摘要:

在天水地震区人工地震测深中,在三条测线上观测了八个炮点的非纵记录。这些非纵剖面旨在判定M面形态及断裂。解释结果认为,本区地壳呈北厚南薄,西厚东薄形态,不仅发现了近东西向的西秦岭北缘断裂,尤其发现了宕昌-通渭,西和-静宁北北东向深部隐伏断裂,在此区域内,存在着一系列近南北向平行深部隐伏断裂,它们的走向与本区M>7的地震排列相一致。

Abstract:

From the data of DSS in Tianshui earthquake area in 1986,a great deal of observational recordes on three fanprofiles with eight shots had been obtained.Designing these fanprofiles aim at distinguishing the Moho feature and fault distribution in this area.According to the interpretated result,we found that the thickness of crust is deeper in north than that in south,in west than that in east.We found not only the Northern Fringe Fault of western segment of Qinling Mountain,whose strike is near EW direction,but also the Tanchang-Tongwei and the Xihe-Jingning NNE deep buried faults.In this area,there are a series parallel deep buried faults on near SN direction and they are segres with the arrangement of M > 7 earthquakes in the area.