The Crust-mantle Structure and Seismic Risk in Tangyin Graben and Its Adjacent Area |
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Authors: | Ren Qingfang Zhang Xiankang Zhang Chengke Zhao Jinren and Zhou Xuesong Research Center of Exploration Geophysics CSB Zhengzhou China |
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Institution: | Ren Qingfang,Zhang Xiankang,Zhang Chengke,Zhao Jinren,and Zhou Xuesong Research Center of Exploration Geophysics,CSB,Zhengzhou 450002,China |
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Abstract: | 1-D and 2-D calculation and interpretation are carried out with the DSS data from the western section of Heze-Changzhi profile and the southern section of Zhengzhou-Jinan profile. 2-D velocity structure is determined in Tangyin graben and its adjacent area. The result shows that velocity structure of the crust and upper mantle is obviously different in vertical and lateral directions. Crustal thickness varies apparently in this area, and there are local low velocity blocks in the interior crust. The swelling M-discontinuity corresponds to Tangyin graben and Moho depth at the highest swelling position is 31 km. Toward the east, its depth gradually increases to 32 km in Xunxian swelling; toward the west, M-discontinuity becomes a steep zone at the piedmont uplift of Taihang Mountain and reaches 40 km at depth near Changzhi. Through analyzing the relationship between historical earthquakes and deep structure in North China, we infer that seismic risk exists in Tangyin graben and its adjacent area. |
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Keywords: | Tangyin graben and its adjacent area Crust/mantle structure Seismic risk |
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