地震学报2019，Vol.41Issue(2)：155-168,14.
利用双差层析成像方法反演青藏高原东南缘地壳速度结构
Crustal structure of southeastern Tibetan Plateau inferred from double-difference tomography
摘要
Abstract
We applied the double-difference tomography to relocate seismic events and deter-mined the crustal structure of the southeastern Tibetan Plateau from the inversion of the local seismic data recorded by regional networks of Yunnan and its surrounding regions from 2010 to 2016. Our results demonstrate that the accuracy of events relocation is significantly improved, and the events are mainly distributed in upper-mid crust at the depths shallower than 20 km. The locations of events are closely related to the velocity structure of upper-mid crust. Most of the earthquakes occurred in some regions with low-velocity anomaly or in the regions between low-velocity and high-velocity anomalies. Tomography results also show that the velocity structure of upper crust exhibits apparent horizontal heterogeneities, which is largely consistent with surface geological and topographic features. In the mid-lower crust, there are two main NS-trending low-velocity zones, one is located in the east of Sichuan-Yunnan diamond block along the trace of Anninghe and Xiaojiang faults, and the other is mainly located in the northwestern Sichuan sub-block and extends to the south across the Lijiang fault. These low-velocity zones are deduced to be the two crustal channels for the southward escape of crustal matter in the middle and lower crust of Tibetan Plateau.关键词
双差层析成像/ 地壳速度结构/ 青藏高原东南缘/ 重定位/ 地壳流/Key words
double difference tomography/ crustal velocity structure/ southeastern Tibetan Plateau/ relocation/ crustal flow/分类
天文与地球科学引用本文复制引用
刘伟,吴庆举,张风雪..利用双差层析成像方法反演青藏高原东南缘地壳速度结构[J].地震学报,2019,41(2):155-168,14.基金项目
国家自然科学基金（41674094）资助 （）
