兴蒙造山带阿尔山火山群地壳厚度与波速比研究

张雅茜 吴庆举 张瑞青 白兰淑

张雅茜,吴庆举,张瑞青,白兰淑. 2022. 兴蒙造山带阿尔山火山群地壳厚度与波速比研究. 地震学报,44(6):949−960 doi: 10.11939/jass.20210070
引用本文: 张雅茜,吴庆举,张瑞青,白兰淑. 2022. 兴蒙造山带阿尔山火山群地壳厚度与波速比研究. 地震学报,44(6):949−960 doi: 10.11939/jass.20210070
Zhang Y X,Wu Q J,Zhang R Q,Bai L S. 2022. Crustal thickness and vP/vS ratio of Arxan volcanic group in Xing’an-Mongolia orogenic belt. Acta Seismologica Sinica,44(6):949−960 doi: 10.11939/jass.20210070
Citation: Zhang Y X,Wu Q J,Zhang R Q,Bai L S. 2022. Crustal thickness and vP/vS ratio of Arxan volcanic group in Xing’an-Mongolia orogenic belt. Acta Seismologica Sinica44(6):949−960 doi: 10.11939/jass.20210070

兴蒙造山带阿尔山火山群地壳厚度与波速比研究

doi: 10.11939/jass.20210070
基金项目: 国家自然科学基金(41874112,41874073)和中国地震局地球物理研究所基本科研业务费专项(DQJB19B26,DQJB20K28)联合资助
详细信息
    作者简介:

    张雅茜,在读硕士研究生,主要从事地球内部结构方面的研究,e-mail:qcxixi@126.com

    通讯作者:

    吴庆举,博士,研究员,主要从事地震学、地球内部结构及地球动力学研究,e-mail:wuqj@cea-igp.ac.cn

  • 中图分类号: P315.31,P315.63

Crustal thickness and vP/vS ratio of Arxan volcanic group in Xing’an-Mongolia orogenic belt

  • 摘要: 利用架设在我国东北地区阿尔山火山区的宽频带流动地震台站记录的远震波形数据,采用P波接收函数H-κ叠加扫描方法,得到了阿尔山火山区的地壳厚度和平均波速比。结果显示:阿尔山地区的地壳厚度范围为33.9—37.9 km,整体呈西北厚东南薄的特点,火山带附近地壳较薄;地壳平均波速比范围为1.73—1.83,主要有柴河镇—明水河镇、伊敏德仁北部和天池镇三处高波速比区。结合前人研究结果推断, 阿尔山火山区薄的地壳和高波速比值可能是由地幔物质上涌、玄武岩浆底侵下地壳所致。

     

  • 图  1  研究区位置及台站分布图

    Figure  1.  Study area and distribution of seismic stations

    图  2  本文所用远震事件分布

    红色三角形为研究区域中心,蓝色圆点为地震事件

    Figure  2.  Distribution of teleseismic events used in this study

    Red triangle is the center of study area,blue dots are seismic events

    图  3  AR01和AR02台站的接收函数波形

    Figure  3.  Receiver functions of the stations AR01 and AR02

    图  4  地壳厚度H (a)和波速比κ (b)的误差分布

    Figure  4.  The error distribution of crustal thickness H (a) and vP/vS ratio κ (b)

    图  5  AR19 (a)和AR35 (b)台站的接收函数波形(上)和H-κ叠加结果(下)

    Figure  5.  Receiver functions (upper panels) and H-κ stacking results (lower panels) of the stations AR19 (a) and AR35 (b)

    图  6  研究区内地壳厚度H (a)与波速比κ (b)分布(白色圈为高波速比区域)

    Figure  6.  Distribution of crustal thickness H (a) and vP/vS ratio κ (b) beneath the stations in the study area (The white circles denote the areas with high vP/vS ratio)

    图  7  地壳厚度H与高程E (a)、波速比κ (b)的关系图

    Figure  7.  Correlations between crustal thickness H and elevations E (a) and vP/vS ratios κ (b)

    表  1  各台站基本信息及相应的H-κ叠加结果

    Table  1.   Basic information of each station and corresponding H-κ stacking results

    台站高程/m接收函数
    条数
    tPs /s地壳厚度/kmvP/vS台站高程/m接收函数
    条数
    tPs /s地壳厚度/kmvP/vS
    AR03 833 72 4.7 37.9±1.9 1.73±0.04 AR18 971 92 4.7 36.9±2.4 1.74±0.06
    AR04 809 29 4.8 36.5±3.1 1.77±0.08 AR19 1129 47 4.8 34.0±1.6 1.83±0.04
    AR05 481 10 4.7 34.4±2.1 1.79±0.05 AR22 663 43 4.8 34.5±2.3 1.81±0.06
    AR06 450 47 4.4 33.9±2.4 1.76±0.06 AR24 878 35 4.8 35.5±2.5 1.77±0.06
    AR07 529 27 4.4 34.4±2.6 1.75±0.06 AR27 986 87 4.7 36.5±2.9 1.76±0.07
    AR08 588 42 4.5 35.5±2.9 1.75±0.07 AR28 1038 79 4.8 35.5±2.8 1.80±0.07
    AR09 883 37 4.6 35.5±1.8 1.76±0.05 AR29 1108 56 5.0 36.0±3.4 1.80±0.09
    AR10 935 27 4.7 36.5±2.6 1.76±0.06 AR30 1179 71 4.7 35.9±3.7 1.77±0.08
    AR11 1124 28 4.9 36.9±1.8 1.77±0.04 AR31 1193 23 4.7 37.5±2.8 1.74±0.06
    AR12 688 83 4.9 34.5±4.0 1.83±0.10 AR32 881 105 5.0 36.0±2.2 1.81±0.06
    AR14 710 90 4.7 34.4±1.9 1.78±0.05 AR33 1042 94 4.7 36.6±2.8 1.77±0.06
    AR16 1254 61 4.7 36.0±2.5 1.76±0.06 AR35 1071 18 4.7 37.0±1.4 1.74±0.04
    AR17 816 43 4.6 35.9±1.7 1.77±0.04
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  • 收稿日期:  2021-05-13
  • 修回日期:  2021-06-18
  • 网络出版日期:  2022-11-03

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