主动源深地震剖面揭示河南地区地壳结构特征  

Crustal Structure Features of Henan Region Revealed by Active Source Deep Seismic Profiles

作　　者：马策军 田晓峰[1] 王帅军[1] 刘宝峰[1] 宋向辉[1,2] 宋佳佳 MA Cejun;TIAN Xiaofeng;WANG Shuaijun;LIU Baofeng;SONG Xianghui;SONG Jiajia(Geophysical Exploration Center,CEA,75 Wenhua Road,Zhengzhou 450002,China;School of Earth Sciences and Resources,China University of Geosciences,29 Xueyuan Road,Beijing 100083,China)

机构地区：[1]中国地震局地球物理勘探中心,郑州市文化路75号,450002 [2]中国地质大学(北京)地球科学与资源学院,北京市学院路29号,100083

出　　处：《大地测量与地球动力学》2023年第12期1218-1223,共6页Journal of Geodesy and Geodynamics

基　　金：国家自然科学基金(41774070);国家重点研发计划(2018YFC1504102)。

摘　　要：回顾河南地区已有的主动源深探测成果,总结其地壳结构特征。结果显示:1)河南省中北部的华北板块表现为上中下3层的简单分层结构、镜像对称的深浅构造以及广泛发育的壳内低速体等地壳特征;南部的秦岭-大别褶皱带地壳表现为横向变化剧烈的速度结构、高速穹隆、大倾角的壳内反射界面以及呈隔档式褶皱的莫霍界面。2)华北盆地地壳厚度的变化主要发生在中下地壳,上地壳厚度较为均匀。秦岭-大别褶皱带深部地壳不存在山根,反映了下地壳沿着莫霍面强烈的滑脱作用。3)河南省不同地区地震分布特征与地壳速度结构关系密切,濮阳地区地震分布受高速异常体控制,许昌地区地震受地壳介质与区域断裂的共同控制,南阳地区地震分布主要受地壳分层结构控制。We present an overview of previous deep seismic sounding(DSS)results in Henan region along with a review of crustal structure features.The results show that:1)The north China plate in north-central Henan province is characterized by a simple upper-middle-lower stratification,mirror-symmetrical deep and shallow tectonics and widely developed low-velocity bodies in the crust,while the crust of the Qinling-Dabie fold belt in the south is characterized by a highly laterally variable velocity structure,high velocity domes,large dip intracrustal reflective interfaces and Moho interfaces in the form of septal folds.2)Changes in crustal thickness in the north China basin occur mainly in the middle and lower crust,while the upper crust is more uniform in thickness.The absence of mountain roots in the deep crust of the Qinling-Dabie fold belt reflects the strong slip action of the lower crust along the Moho surface.3)The characteristics of earthquake distribution in different regions of Henan province are closely related to the velocity structure of the crust.The distribution of earthquakes in Puyang is controlled by high-speed anomalies,in Xuchang it is controlled by a combination of crustal media and regional fractures,while in Nanyang it is mainly controlled by the stratified structure of the crust.

关 键 词：主动源 地壳结构特征 地震分布特征 河南地区 

分 类 号：P313[天文地球—固体地球物理学] P315[天文地球—地球物理学]