Constraining 3-D Shear Velocity and Anisotropy Structure Beneath the Tien Shan from Shear Wave Splitting and Surface Wave Tomography

这一奖项为通过分析体波和面波资料研究天山中部地壳和上地幔结构提供了支持。天山是地球上最活跃的陆内山带，是研究板块内造山机制和动力学过程的独特场所。这项研究包括两个部分：横波分裂分析和面波层析。本项目使用的数据由CHENGIS台网、KNet台网、11个台站的区域长期阵列和两个永久性GSN台站记录，这是一项为期三年的地震试验，由28个宽带台站组成。对SKS波和区域S波进行了分析，得到了天山中部各台站的剪切波分裂参数。此外，还利用瑞利波和乐夫波资料求解了横波速度和各向异性的三维变化。总而言之，这些分析有助于回答天山中部岩石圈的厚度和强度是如何变化的，以及天山山脉是由地壳缩短单独产生的，还是由岩石圈中的相干变形产生的。

This award provides support for studying the structure of crust and upper mantle in the central Tien Shan by analyzing body and surface wave data. The Tien-Shan is the most active intracontinental mountain belt on the Earth and is a unique place for investigating the mechanism and dynamic process of mountain building within a tectonic plate. There are two components in this study: shear-wave splitting analyses and surface wave tomography. The data used in this project are recorded by the CHENGIS network, a three-year seismic experiment consisting of twenty-eight broadband stations, the KNET network, a regional long-term array of eleven stations, and two permanent GSN stations. Both SKS and regional S waves are analyzed to obtain shear-wave splitting parameters at the stations in the central Tien Shan. In addition, Rayleigh and Love wave data are used to solve for 3D variations of shear-wave velocity and anisotropy. Together, these analyses can help to answer how the thickness and the strength of the lithosphere vary across the central Tien Shan and whether the Tien Shan range is generated by crust shortening alone or by coherent deformation in the lithosphere.