晋冀蒙交界地区的地壳厚度与泊松比特征

Abstract

Abstract: Based on the high-quality teleseismic data recorded by 78 stations in the fixed and mobile stations in the border area of Shanxi, Hebei and Inner Mongolia, a total of 6978 receiver functions were obtained, and the crustal thickness and wave velocity ratio were calculated in the research area. The results show that the crustal thickness of the study area is between 31 km and 45 km, and the variation span is large. It gradually thickens from east to west and exhibits graded property along the southeast-northwest direction. The crustal velocity ratio below the stations is between 1.63 and 1.90, and the corresponding Poisson’s ratio is 0.18 to 0.31. The velocity ratio has obvious block characteristics. The relatively high values mostly distribute in the central zone of the sedimentary basins and their vicinity. The lower values are located in the middle of the Taihang Mountain and the Lüliang Mountain area. The wave velocity ratio of Datong volcanic area is higher than that of the surrounding area, illustrating the upwelling of mantle materials caused by the violent activity of the volcanos. It is characterized that the average velocity ratio of the crust below the stations at the Taihang Mountain fault zone gradually decrease from north to south, which indicates the obvious layered crustal structure in this area, and the difference of crustal medium composition between the plain and the mountain regions.

Key words: Shanxi, Hebei and Inner Mongolia, North China Craton, Receiver function, The crustal thickness, The velocity ratio of P and S wave

CLC Number:

P315.7

WU Peng, JIA Hua, ZHANG Xiao-tao, WANG Xue-fei, LIU Shuang. Characteristics of Crustal Thickness and Velocity Ratio atthe Junction of Shanxi, Hebei and Inner Mongolia[J]. EARTHQUAKE, 2019, 39(4): 63-75.

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Characteristics of Crustal Thickness and Velocity Ratio atthe Junction of Shanxi, Hebei and Inner Mongolia

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