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

鲜水河断裂带南北构造差异性的地球物理分析

艾依飞 ,? 张健

引用本文: 艾依飞,?张健. 2019.?鲜水河断裂带南北构造差异性的地球物理分析.?地震学报,?41(3):?329-342. doi: 10.11939/jass.20180109 shu
Citation:? Ai Yifei,?Zhang Jian. 2019.?Geophysical analysis on the tectonic difference between northern and southern segments of Xianshuihe fault zone.?Acta Seismologica Sinica,?41(3):?329-342. doi: 10.11939/jass.20180109 shu

鲜水河断裂带南北构造差异性的地球物理分析

    通讯作者: 张健, zhangjian@ucas.edu.cn
摘要: 对鲜水河断裂带重磁异常进行向上延拓,通过计算观测面高度异常与延拓后异常之间的相关系数得出最佳向上延拓高度,该延拓高度所对应的延拓结果即为研究区构造背景产生的异常值。向上延拓结果显示布格重力异常值沿鲜水河断裂带自北西向南东逐渐增大,反映出下地壳底边界沿该方向呈升高趋势,可能由青藏高原地壳软弱物质 “东向逃逸” 所致。化极后ΔT磁异常延拓结果表明鲜水河断裂带南东段的康定—石棉以东为强磁性刚性基底。以鲜水河断裂带为分界的不同地块之间基底岩石及地层物性的不同是断裂带南北磁性差异的主导原因。对鲜水河断裂带两侧各约50 km范围内地震的震源深度进行统计,经投影至剖面及线性拟合求出鲜水河断裂带的三维几何形状。结果表明鲜水河断裂带总体倾向南西,倾角近乎直立,范围约为57°—88°。

English

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  • 图?1? 鲜水河断裂带及邻区地质构造简图

    Figure?1.? Generalized geological structure map of Xianshuihe fault zone and its adjacent areas

    图?2? 相关系数、布格重力异常与化极后ΔT磁异常向上延拓结果

    Figure?2.? Upward continuation results of correlation coefficients,Bouguer gravity anomaly and polarized aeromagnetic anomaly

    图?3? 地震震源深度典型剖面反演及断裂三维几何形状拟合等值面图

    Figure?3.? The inversion of focal depths of seismic events in typical profiles and the map of three-dimensional geometry fitting isosurface of Xianshuihe fault zone

    图?4? 重磁异常延拓与鲜水河断裂带三维几何形状切片图

    Figure?4.? The upward continuation result of gravity-magnetic anomaly and the slices of three-dimensional geometry about Xianshuihe fault zone

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  • 通讯作者:? 张健, zhangjian@ucas.edu.cn
  • 收稿日期:? 2018-09-04
  • 录用日期:? 2019-03-20
  • 网络出版日期:? 2019-05-01
通讯作者: 陈斌, bchen63@163.com
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