云南地区Lg波衰减成像研究

刘森 边银菊 王婷婷 鲁志楠

刘森,边银菊,王婷婷,鲁志楠. 2021. 云南地区Lg波衰减成像研究. 地震学报,43(4):410−426 doi: 10.11939/jass.20200101
引用本文: 刘森,边银菊,王婷婷,鲁志楠. 2021. 云南地区Lg波衰减成像研究. 地震学报,43(4):410−426 doi: 10.11939/jass.20200101
Liu S,Bian Y J,Wang T T,Lu Z N. 2021. Study on Lg wave attenuation imaging in Yunnan. Acta Seismologica Sinica,43(4):410−426 doi: 10.11939/jass.20200101
Citation: Liu S,Bian Y J,Wang T T,Lu Z N. 2021. Study on Lg wave attenuation imaging in Yunnan. Acta Seismologica Sinica43(4):410−426 doi: 10.11939/jass.20200101

云南地区Lg波衰减成像研究

doi: 10.11939/jass.20200101
基金项目: 核查项目(075440)资助
详细信息
    通讯作者:

    边银菊,e-mail:bianyinju@cea-igp.ac.cn

  • 中图分类号: P315.3+1

Study on Lg wave attenuation imaging in Yunnan

  • 摘要: 收集了云南省及周边121个固定台站于2014年5月—2019年5月记录到的470次M≥4.0宽频带地震记录,利用反双台法处理了6 976条垂直向波形数据,通过LSQR方法反演得到了云南地区的空间分辨率小于100 km的1 Hz下Lg波衰减成像。反演结果表明,云南地区地壳Lg波的Q0值介于60—300,整体为低Q0背景,横向不均匀性变化显著。云南地区低Q0值的分布特点,反映了Lg波在云南地区衰减强烈。红河断裂西侧Q0值较低,在50—160之间,东侧Q0值较高,在120—200之间,分布特征与沉积层厚度分布一致,松散的沉积层可能是造成东侧地区Lg波高衰减的主要原因。云南地区地壳Lg波Q0值呈现出了与地表热流值分布相似的差异化分布特征,这可能与频繁的地震、长期强烈的构造运动以及深部物质随火山活动上涌有关。

     

  • 图  1  云南地区构造示意图及M≥6.0地震分布图

    F1:金沙江断裂;F2:怒江断裂;F3:南汀河断裂;F4:澜沧江断裂;F5:无量山断裂;F6:丽江断裂;F7:程海断裂;F8:红河断裂;F9:安宁河断裂;F10:绿汁江断裂;F11:则木河断裂;F12:小江断裂

    Figure  1.  Regional tectonic settings and distribution of M≥6.0 earthquakes in Yunnan area

    F1:Jinshajiang fault;F2:Nujiang fault;F3:Nantinghe fault; F4: Lancangjiang fault;F5:Wuliangshan fault;F6:Lijiang fault; F7:Chenghai fault;F8:Honghe fault;F9:Anninghe fault; F10: Lüzhijiang fault;F11:Zemuhe fault;F12:Xiaojiang fault

    图  2  云南地区地表大地热流分布

    Figure  2.  Terrestrial heat flow distribution in Yunnan area

    图  3  云南地区沉积层厚度分布

    Figure  3.  Distribution of sediment thickness in Yunnan area

    图  4  地震事件和台站分布图

    Figure  4.  Map of earthquake events and stations

    图  5  2018年1月7日缅甸ML5.6地震波形及Lg波速度窗口示意图

    Figure  5.  ML5.6 earthquake waveform and Lg wave velocity window on January 7,2018 in Burma

    图  6  反双台法示意图

    红色星形ab代表两个地震事件,黑色三角形ij代表两个台站。d代表距离,θ表示两个台站到一个事件的夹角(a) 理想情况下反双台法的几何路径;(b) 实际情况中的反双台法的几何路径

    Figure  6.  Schematic diagram of reverse two-station method

    The red stars (a and b) represent earthquakes and the black triangles (i and j) are seismic stations. d represents the distance. θ represents the angle between two stations and an event (a) Ideal recording geometries for the application of reverse two-station method;(b) Practical geometries in reverse two-station method

    图  7  Lg波反双台法射线数量

    Figure  7.  The number of rays of Lg wave using reverse two-station method

    图  8  云南地区Lg波Q0值射线分布

    Figure  8.  Distribution of Q0 rays for Lg wave in Yunnan area

    图  9  云南反双台法射线的Lg波Q0值分布

    Figure  9.  Q0 value distribution using reverse two-station method in Yunnan area

    图  10  2°,1°以及0.5°的检测板模型(a)及测试结果(b)

    Figure  10.  2°,1° and 0.5° checkboard models (a) and test results (b)

    图  11  Lg波衰减Q0值的二维成像结果图

    Figure  11.  Two-dimensional imaging result diagram of Q0 value for Lg wave attenuation

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  • 收稿日期:  2020-06-29
  • 修回日期:  2020-10-03
  • 网络出版日期:  2021-08-16
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