地质学报2012，Vol.86Issue(3)：371-382,12.DOI:11-1951/P.20120307.1328.011
太行山构造带及其以东地区上地幔地震层析成像
Upper Mantle Seismic Tomography Under Taihangshan Tectonic Belt and Areas at Its East
摘要
Abstract
Based on P and S wave travel times of local, regional and far earthquakes recorded on 115 station distributed in capital area and Handan network in Hebei Province, P and S wave velocity structures beneath Taihangshan tectonic belt and areas at its east were obtained in the depth of 300km by seismic tomography technology. The results show that, there exists obviously transversal unhomogeneous in upper mantle velocity profiles along Taihangshan tectonic belt, where its southern, middle and northern segments exhibits their different structure features. Beneath the area at the east of Taihangshan, the lithosphere is thin, and the asthenosphere here is at the depth of about 80km. But under the depth of 180km, the P wave velocity structures show large differences in S wave velocity structures, in which at the east area of North China there presents mainly high P wave velocity, while S wave velocity maintains relatively low in most areas of North China basins although the low velocity media is cut by high velocity bodies. The deep structures demonstrate that, the middle segment of Taihangshan had been affected strongly by the lithospheric thinning in North China, and its velocity structure is much consistent with that beneath the basins. While the tectonic activity in southern segment was controlled apparently by shallow faults, but the upper mantle may maintain the character of old orogen with thick lithosphere and more high velocity media in upper mantle. The northern segment of Taihang belt, located at the boundary of multi-tectonic area, is complicated in velocity structure, and part low velocity region may be connected with mantle upwelling.关键词
地震层析成像/太行山构造带/上地幔/低速体/分段性特征Key words
Seismic tomography/ Taihangshan tectonic belt/ Upper mantle/ Low velocity body/Segmental characteristics引用本文复制引用
张学民,杨文采,赵大鹏,张从珍,李永红,刁桂苓..太行山构造带及其以东地区上地幔地震层析成像[J].地质学报,2012,86(3):371-382,12.基金项目
本文为国家重点基础科研973项目(编号2003CB716505)、中国博士后自然科学基金(编号20060390507)和地质过程与矿产国家重点实验室项目(编号GPMR0550)共同资助的成果. （编号2003CB716505）
