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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. 地震学报, 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 Sinica41(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条天然地震的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地震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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