利用面波波形模拟探测中国大陆地壳和上地幔波速结构的分区特征  

Region-related features of crustal and upper-mantle velocity structure of the Chinese mainland detected by surface waveform modeling

作　　者：冯梅[1] 安美建[1] Suzan van der Lee 

机构地区：[1]中国地质科学院地质力学研究所,中国北京100081 [2]Department of Earth and Planetary Sciences, Northwestern University, Evanston IL 60208-2150, USA

出　　处：《地震学报》2008年第2期114-122,共9页Acta Seismologica Sinica

基　　金：国家自然科学基金(40504011,40674058);中国地质科学院地质力学研究所基本科研业务费(DZLXJK200707)共同资助

摘　　要：对穿过中国大陆东部、中部、北部和西部4个不同地区的8条地震射线路径的波形进行拟合分析,反演得到了各路径下方的一维平均波速结构.反演得到的地壳和上地幔波速结构表现出明显的分区特征,该特征与已知的大地构造单元和已有的研究成果吻合较好.表明面波波形拟合方法是一种可靠的探测地壳和上地幔波速结构的方法,且比单纯利用基阶面波频散对上地幔结构探测更具优势.The present study firstly analyzed surface waveform fittings for 8 wave paths crossing through four different regions of the Chinese mainland （eastern, central, northern and western China）, and then inverted for 1D pathaveraged S-velocities for such paths. The inverted crustal and upper-mantle S-velocities showed obvious region-related features, which are well consistent with known geotectonic units and previous research results. Such analyses showed that surface waveform modeling is a reliable method to get crustal and upper-mantle velocity structure. Furthermore, this method has a prominent advantage in detecting upper-mantle structure compared with fundamental-mode surface-wave dispersion method.

关 键 词：面波波形模拟 分区特征 地壳和上地幔波速 中国大陆 

分 类 号：P315.31[天文地球—地震学]