Upper-mantle shear-wave structure under East and Southeast Asia from Automated Multimode Inversion of waveforms
Upper-mantle shear-wave structure under East and Southeast Asia from Automated Multimode Inversion of waveforms
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DOI：
10.1093/gji/ggv322
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发表时间：
2015-10
影响因子：
2.8
通讯作者：
C. Legendre;Li Zhao;Qi‐Fu Chen
中科院分区：
文献类型：
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作者：
C. Legendre;Li Zhao;Qi‐Fu Chen
本文提出了一个新的东亚和东南亚地区上地幔SV速度模型，该模型是由宽带台站记录的地震波形反演约束的。1977年至2012年期间发生的地震的地震记录是从该地区约4786个永久和临时台站随时随地收集的。表面和多S波形的自动多模反演被应用于从地震记录中提取结构信息，其形式为具有不相关不确定性的线性方程。然后，求解方程的地壳和上地幔的地震速度扰动相对于一个三维（3-D）的参考模型和一个现实的地壳。艾德给出了东亚和东南亚岩石圈-软流圈系统的主要特征。在岩石圈深度，可以看到低速度在西藏之下，而高速度则出现在西伯利亚、华北、扬子、塔里木、达瓦和达瓦地区。一些微板映射和与相邻板的相互作用进行了讨论。在上地幔中可以看到来自太平洋和印度洋的板块。被动边缘盆地和俯冲带也得到适当解决。
We present a new Sv-velocity model of the upper mantle under East and Southeast Asia constrained by the inversion of seismic waveforms recorded by broad-band stations. Seismograms from earthquakes occurred between 1977 and 2012 are collected from about 4786 permanent and temporary stations in the region whenever and wherever available. Automated Multimode Inversion of surface and multiple-S waveforms is applied to extract structural information from the seismograms, in the form of linear equations with uncorrelated uncertainties. The equations are then solved for the seismic velocity perturbations in the crust and upper mantle with respect to a three-dimensional (3-D) reference model and a realistic crust. Major features of the lithosphere–asthenosphere system in East and Southeast Asia are identified in the resulting model. At lithospheric depth, low velocities can be seen beneath Tibet, whereas high velocities are found beneath cratonic regions, such as the Siberian, North China, Yangtze,) Tarim, and Dharwarand cratons. A number of microplates are mapped and the interaction with neighbouring plates is discussed. Slabs from the Pacific and Indian Oceans can be seen in the upper mantle. Passive marginal basins and subduction zones are also properly resolved.