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

通过剪切波分裂和表面波层析成像约束天山下方的 3-D 剪切速度和各向异性结构

• 批准号: 0536948
• 负责人: Aibing Li
• 金额: $ 12.14万
• 依托单位: University of Houston
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-05-01 至 2009-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0536948&HistoricalAwards=false
• 关键词: Constraining; Shear; Velocity; Anisotropy; Structure

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.

该成果为通过体波和面波资料分析研究天山中段地壳上地幔结构提供了支持。 天山是地球上最活跃的陆内造山带，是研究板块内造山作用机制和动力学过程的独特场所。 在这项研究中有两个组成部分：剪切波分裂分析和表面波层析成像。 该项目中使用的数据由CHENGIS网络记录，该网络是一个为期三年的地震实验，由28个宽带台站、KNET网络、11个台站的区域长期阵列和两个永久性GSN台站组成。 分析SKS和区域S波，以获得天山中部台站的剪切波分裂参数。 此外，瑞利波和洛夫波数据被用来解决三维变化的剪切波速度和各向异性。总之，这些分析可以帮助回答的厚度和强度的岩石圈的变化在整个天山中部，天山山脉是由地壳缩短单独或相干变形的岩石圈。