上海及邻区重磁场的地震地质分析

本文在完成上海及邻近地区海陆连片的地质和地球物理编图的基础上, 对其中的重力和磁力异常图进行地震地质分析和解释。文章指出了中国南北两大陆块拼合的东部深处界线的位置, 并指出了扬子准地台和华南褶皱系两大构造单元在上海一带的分界线的部位。在阐述该区断裂特征和一般规律的基础上论述了一些活动断裂的存在, 为该区进行地震构造区划和制定抗震防灾措施提供了基础资料和科学依据。

SEISMIC-GEOLOGIC ANALYSIS OF GRAVITY ANDMAGNETIC FIELDS IN SHANGHAI ANDNEIGHBORING AREAS

Based on the compilation of the joined marine-continental maps for Shang-hai and its neighboring areas, the seismic-geologic analysis and interpretationare made for maps of gravity and magnetic anomalies so as to extract infor-mation related to seismism. The eastern deep boundary between the two largecontinental blocks of China is indicated; the boundary in Shanghai area bet-ween two great tectonic units, i. e., Yangtze paraplatform and South China foldsystem, is suggested; on the basis of a discussion on characteristics of faultsand general regularity of this area, this paper demonstrates the existence ofsome active fractures, thus providing basic data and scientific grounds for theseismic structural regionalization and the formulation of anti-seismic measures.