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ISSN?0253-3782 CN?11-2021/P

青藏高原中东部地壳和上地幔顶部P波层析成像

张戈铭 ,? 李细兵 ,? 郑晨 ,? 宋晓东

引用本文: 张戈铭,?李细兵,?郑晨,?宋晓东. 2019.?青藏高原中东部地壳和上地幔顶部P波层析成像.?如何登录365bet_365bet官网备用网址_365bet体育在线世爵学报,?41(4):?411-424. doi: 10.11939/jass.20190003 shu
Citation:? Zhang Geming,?Li Xibing,?Zheng Chen,?Song Xiaodong. 2019.?Crustal and uppermost mantle velocity structure beneath the central-eastern Tibetan Plateau from P-wave tomography.?Acta Seismologica Sinica,?41(4):?411-424. doi: 10.11939/jass.20190003 shu

青藏高原中东部地壳和上地幔顶部P波层析成像

    通讯作者: 宋晓东, xiao.d.song@gmail.com
摘要: 为获取青藏高原中东部地壳和上地幔顶部的精细结构,本文基于1万4 484条天然如何登录365bet_365bet官网备用网址_365bet体育在线世爵的P波(Pg和Pn)到时数据,对青藏高原中东部地壳和上地幔顶部进行P波三维速度结构层析成像,获取了该区域内地壳P波、上地幔顶部Pn波的速度结构和地壳厚度信息。层析成像结果显示,青藏高原中东部地壳P波速度范围为5.2—7.2 km/s,上地幔顶部Pn波速度范围为7.7—8.4 km/s,地壳厚度范围为48.0—68.6 km,地壳和上地幔顶部存在强烈的横向不均匀性,与地质块体分布有较好的对应关系。地壳P波速度结构显示,研究区中、下地壳分布有较大范围的低速区,上地壳与中下地壳P波分布存在明显的差异:羌塘地块和巴颜喀拉地块在上地壳主要表现为高速异常,随着深度增加逐渐表现为低速异常;而柴达木地块在上地壳主要表现为低速异常,下地壳则表现为高速异常;柴达木地块和拉萨地块在上地幔顶部表现为较高的Pn波速度,最高约为8.4 km/s,而在巴颜喀拉地块和羌塘地块东部,Pn波总体上表现为低速,最低约为7.7 km/s。研究区内地壳厚度的总体特征表现为南厚北薄,其中羌塘地块东部和拉萨地块的地壳较厚,而柴达木地块和巴颜喀拉地块东部的地壳相对较薄,羌塘地块西部存在局部的地壳变薄现象,反映了印度板块对欧亚板块北向俯冲作用下的岩石圈变形特征。

English

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  • 图?1? 研究区地质概况及各台网台站分布

    Figure?1.? Topography of the study region and distribution of stations of seismic networks

    图?2? 2008年12月18日ML5.1如何登录365bet_365bet官网备用网址_365bet体育在线世爵事件的初至波走时拾取效果

    Figure?2.? First arrival time picks from an ML5.1 earthquake on December 18,2008

    图?3? 一维模型及其初始模型

    Figure?3.? One-dimensional model and its initial model

    图?4? 联合反演射线覆盖

    Figure?4.? Ray coverage of joint inversion

    图?5? 联合反演的残差分析和走时分布

    Figure?5.? Residual analysis and travel time distribution of joint inversion

    图?6? 1.5°×1.5°网格下的检测板检测

    Figure?6.? Checkerboard test with squares of 1.5 degree by degree

    图?7? 地壳Pg波速度结构和上地幔顶部Pn波速度结构

    Figure?7.? Velocity structure of Pg and Pn waves

    图?8? 青藏高原中东部的莫霍面深度分布

    Figure?8.? Distribution of Moho depth of the central-eastern Tibetan Plateau

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  • 通讯作者:? 宋晓东, xiao.d.song@gmail.com
  • 收稿日期:? 2019-01-08
  • 录用日期:? 2019-03-29
  • 网络出版日期:? 2019-07-01
通讯作者: 陈斌, bchen63@163.com
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