Continental China is located in the southeastern portion of the Eurasia, surrounded by three major plates: the Indian plate, the Philippine plate and the Pacific plate. Owing to the interactions of the three plates, the continental China has complex geological structures, drastic crustal deformations and frequent earthquake activities. Complex tectonic environment makes continental China an important region for studying the continental dynamics and intraplate tectonics. To determine high-resolution Vp and Vs models of the lithosphere of continental China, we have assembled numerous high-quality arrival-time data from 11953 earthquakes recorded by the China Digital Seismic Network. Double-difference seismic tomography is applied to simultaneously determine earthquake locations, Vp and Vs models. The checkerboard resolution test shows that with the current data configuration both Vp and Vs models have a spatial resolution of 1° in the horizontal direction in most of continental China and up to 0.5° in eastern China. Highresolution Vp and Vs models of crust and upper mantle down to 150 km provide important constraints on tectonics beneath continental China. Overall, our tomographic images in the shallow crust correlate well with surface geology. In the deeper part, our velocity models show some well known features such as low velocity layer in the middle crust beneath Tibetan plateau and thin lithosphere beneath north China craton. After determining Vp and Vs models, we followed the method of Fang et al.（2018） to determine the Vp/Vs model of the lithosphere in continental China. Compared to Vp and Vs models, Vp/Vs is more sensitive to temperature and fluids in the lithosphere. We will also systematically compare the relationship between velocity structures and earthquake locations.
类型: 国际会议
作者: ZHANG Haijiang,XIN Hailiang
来源: 第九届世界华人地质科学研讨会 2019-06-01
年度: 2019
分类: 基础科学,工程科技Ⅰ辑
专业: 地质学,地球物理学,地球物理学,矿业工程
单位: University of Science and Technology of China, School of Earth and Space SciencesChina Deep Exploration Center of the Chinese Academy of Geological Sciences
分类号: P31;P631.4
DOI: 10.26914/c.cnkihy.2019.028331
页码: 98
总页数: 1
文件大小: 71k
下载量: 1
本文来源: https://www.lunwen90.cn/article/afc253c0cc380f0464e90fb4.html