Passive seismic experiment and ScS wave splitting in the southwestern subbasin of South China Sea  

作　　者：RUAN AiGuo LI JiaBiao LEE ChaoShing QIU XueLin PAN ShaoJun 

机构地区：[1]The Second Institute of Oceanography,State Oceanic Administration,Hangzhou 310012,China [2]Institute of Applied Geosciences,Taiwan Ocean University,Keelung 20224,China [3]South China Sea Institute of Oceanology,Chinese Academy of Sciences,Guangzhou 510301,China

出　　处：《Chinese Science Bulletin》2012年第25期3381-3390,共10页

基　　金：supported by the National Natural Science Foundation of China (91028006,40876035 and 41106053);the National Basic Research Program of China (2007CB411701)

摘　　要：The seismic experiment of 3D array of OBS in the southwestern sub-basin of the South China Sea(SCS) is briefly introduced in this paper.The data analysis of broadband OBS shows that totally 93 earthquakes with magnitude of Ms 6.0-6.9 and 10 earthquakes with magnitude above Ms 7.0 were recorded in high quality during this experiment,especially the catastrophic earthquake Ms 9.0 occurred in the east sea area of Japan on March 11,2011.The anisotropy parameters inversion of ScS wave of four events above Ms 7.0 indicates that the fast direction of shear wave is N58°E parallel to the ceased spreading ridge of the southwestern sub-basin of SCS(the slow direction is S35°E perpendicular to the spreading ridge),which means the spreading ridge is under compressing stress at present and the cessation of seafloor spreading is related to such stress field as well.The seismic experiment of 3D array of OBS in the southwestern sub-basin of the South China Sea （SCS） is briefly introduced in this paper. The data analysis of broadband OBS shows that totally 93 earthquakes with magnitude of Ms 6.0-6.9 and 10 earthquakes with magnitude above Ms 7.0 were recorded in high quality during this experiment, especially the catastrophic earthquake Ms 9.0 occurred in the east sea area of Japan on March 11,201 I. The anisotropy parameters inversion of ScS wave of four events above Ms 7.0 indicates that the fast direction of shear wave is N58°E parallel to the ceased spreading ridge of the southwestern sub-basin of SCS （the slow direction is S35°E perpendicular to the spreading ridge）, which means the spreading ridge is under compressing stress at present and the cessation of seafloor spreading is related to such stress field as well.

关 键 词：地震实验 中国南海 西南海盆 分裂 三维数组 数据分析 参数反演 各向异性 

分 类 号：P738.4[天文地球—海洋地质]