北京大学学报（自然科学版）2024，Vol.60Issue(3)：442-452,11.DOI:10.13209/j.0479-8023.2024.018
基于背景噪声反演华南块体岩石圈三维S波速度结构
3-D S-wave Lithosphere Structure of South China Block Based on Ambient Noise Tomography
摘要
Abstract
Using continuous records of 704 stations from several mobile arrays,high-resolution S wave velocity structure of South China Block(SCB)was obtained by ambient noise tomography.In 3-D S wave velocity model,the velocities in shallow crust are well consistent with the surface geology and low velocity anomalies concentrate in Sichuan Basin and Jianghan Basin.The boundary between Yangtze Block and Cathaysian Block can be identified by a high-velocity belt in crust,which is Jiangnan Orogeny generated in collision.The low velocity anomaly of Cathaysian Block in middle crust is related to the widespread Mesozoic granite.In upper mantle,there are significant differences between the east and west South China Block:the west South China Block presents a significant high velocity anomaly which reflects a stable craton in Sichuan Basin;the low velocity anomaly in east South China Block reveals that the lithosphere has been thinned(<70 km)by the subduction of paleo-Pacific Plate.Besides,it is speculated that the low velocity anomaly of Qiongzhou Strait in upper mantle may correspond to the Hainan plume.关键词
华南块体/S波速度结构/江南造山带/板块俯冲Key words
South China Block(SCB)/S wave velocity structure/Jiangnan Orogeny/plate subduction引用本文复制引用
吕杰,陈永顺,郭震..基于背景噪声反演华南块体岩石圈三维S波速度结构[J].北京大学学报（自然科学版）,2024,60(3):442-452,11.基金项目
国家自然科学基金(U1901602)资助 （U1901602）
