首页|The heterogeneous characteristics of crust-mantle structures and the seismic activities in the northwest Beijing region
The heterogeneous characteristics of crust-mantle structures and the seismic activities in the northwest Beijing region
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国家科技期刊平台
NETL
NSTL
万方数据
维普
In this paper, the abnormal characteristics of the crustal structures in the seismic active region, Yanqing-Huailai and Zhangbei-Shangyi, are obtained by means of comprehensively interpreting and studying the data of deep seismic sounding profiles passing through the northwestern part of Zhangjiakou-Bohai seismic zone. The results show that the fluctuation of crystalline basement in the study region is obvious and that there exist considerable differences in depth in different geological units. The locally abrupt variation of crystalline basement depths may be regarded as a mark of existence of crystalline basement faults. These crystalline basement faults and deep crustal faults provide a pass for the magma upwelling, resulting in the strong inhomogeneity of crustal structures. These phenomena of the complex seismic reflected waves and locally discontinuous reflection zones with different energy indicate that the intensive squeeze and deformation of crust took place, which have led to the complex crustal structures and offered the dynamic source for the earthquake occurrence in this region. The low velocity bodies in different depths of crust and the local interface C1 in Zhangbei-Shangyi region may result from repeated magmatic activities. The certain stress accumulation in the brittle upper crust can cause the occurrence of earthquake under the action of local tectonic activity.
northwest Beijing regionseismic soundingshallow and deep structuresearthquake-generating backgrounds
ZHAO Jin-Ren、ZHANG Xian-kang、ZHANG Cheng-ke、Zhang Jian-shi、LIU Bao-feng、REN Qing-fang、PAN Su-Zhen、Hai Yan
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Exploration Geophysics Center, China Earthquake Administration, Zhengzhou 450002, China
国家自然科学基金Key Project from China Earthquake Administration during the ninth Five-year Plan
国家科技期刊平台
NSTL
万方数据
维普
