晋冀蒙交界地区的地壳厚度与泊松比特征

地震 ›› 2019, Vol. 39 ›› Issue (4): 63-75.

晋冀蒙交界地区的地壳厚度与泊松比特征

吴鹏^1,2, 贾华¹, 张小涛¹, 王雪飞¹, 刘爽¹

1.河北省地震局邯郸中心台, 河北邯郸 056001;
2.河北省地震局测震专业仪器系统检测评估与观测场地遴选创新团队, 河北石家庄 050021

收稿日期:2018-10-24 出版日期:2019-10-31 发布日期:2019-10-30
作者简介:吴鹏(1982-), 男, 河北邯郸人, 高级工程师, 主要从事测震台网监测与仪器维护工作。
基金资助:
中国地震局监测、预测、科研三结合课题(CEA-JC/3JH-160306); 河北省地震科技星火计划项目(DZ20150423074)

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

WU Peng^1,2, JIA Hua¹, ZHANG Xiao-tao¹, WANG Xue-fei¹, LIU Shuang¹

1.Handan Seismic Station, Hebei Earthquake Agency, Handan 056001, China;
2.Innovative
Research Team of Hebei Earthquake Agency for Seismograph’s Calibration, valuation and Selection of observation sites, Shijiazhuang 050021, China

Received:2018-10-24 Online:2019-10-31 Published:2019-10-30

摘要/Abstract

摘要： 根据晋冀蒙交界地区固定台和流动台共计78个台站记录的高质量远震资料, 得到了共计6978个接收函数, 反演了晋冀蒙交界地区的地壳厚度与波速比结果。结果显示, 研究区的地壳厚度在31~45 km, 变化幅度较大, 具有由东向西逐渐加厚的横向变化, 并且沿着东南—西北方向有渐变特征。台站下方地壳速度比在1.63~1.90, 对应的泊松比在0.18~0.31, 具有明显的分块特征。波速比相对较高的地区多为沉积盆地断陷中心地带及附近区域, 波速比较低的区域分布在太行山脉中段与吕梁山地区等隆起区域附近。大同火山区波速比高于周边地区, 是火山剧烈活动引起地幔物质上涌的反映。太行山山前断裂带附近的台站下方地壳平均速度比呈现由北向南逐渐减小的特征, 表明此区域地壳分层结构明显, 同时也反映了平原地区与山脉地区的地壳介质成分的差异。

关键词: 晋冀蒙, 华北克拉通, 接收函数, 地壳厚度, 波速比

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

中图分类号:

P315.7

吴鹏, 贾华, 张小涛, 王雪飞, 刘爽. 晋冀蒙交界地区的地壳厚度与泊松比特征[J]. 地震, 2019, 39(4): 63-75.

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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