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• W110031447 abstract "In this paper, the crust structures in the southern part of the Beijing, Tianjin and Tangshan area are studied by using the data obtained mainly from two perpendicular DSS profiles (which are the Renxian-Wuqing profile and the Haixing-Yangyuan profile) as well as from the data of other profiles. According to the results, the crust can be vertically divided into the three parts: the upper, the middle and the lower crust. There exists a low velocity layer in the middle crust. There is no evident lateral variation in the crust structure in NE direction whereas in NW direction it shows quite a strong lateral inhomogeneity. The crust thickens and the low velocity layer dips down in the Taihang uplift. But in the Haixing region near the Bohai Sea, the crust thickness diminishes evidently. These DSS results complemented by the other data show that the Bohai region is an uplifted center of the upper mantle. At last, a preliminary study is made about the relationship between the deep structure and the strong earthquakes which took place in recent years around the Bohai bay, i. e., the Bohai earthquake (1969, MS = 7.4), the Haicheng earthquake (1975, Ms = 7.3) and the Tangshan earthquake (1976, Ms = 7.8). Since 1966, there has been a seismic active period in North China. A series of earthquakes with magnitudes Ms ≥ 6 took place. A rather interesting thing is that the strong earthquakes with magnitudes Ms ≥ 7 occurred almost around the Bohai bay. Since seismicity is an indication of deep tectonic motion, deep sounding is very important for earthquake prediction. For this purpose, exploration of the crust and upper mantle in a large scale in North China has been made by the Geophysical Prospecting Brigade of the State Seismological Bureau. The main method used is the DSS technique, and Beijing-Tianjin-Tangshan area has been chosen as the area studied in detail. In this paper, some DSS data from different profiles in the southern part of the studied region are interpreted as a whole. According to different conditions, the laterally homogeneous and inhomogeneous crust-upper mantle models are employed respectively. By using forward and inverse methods, we want to get the precise crust structures in this region." @default.
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• W110031447 date "1991-01-01" @default.
• W110031447 modified "2023-09-25" @default.
• W110031447 title "STRUCTURES OF CRUST AND UPPER MANTLE IN SOUTHERN PART OF BEIJING-TIANJIN-TANGSHAN AREA" @default.
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• W110031447 doi "https://doi.org/10.1016/b978-0-08-036390-5.50022-1" @default.
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