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上海张堰−金山卫隐伏活动断层活动特征及综合地球物理证据

宋春华 郁飞 施刚

宋春华,郁飞,施刚,2023. 上海张堰−金山卫隐伏活动断层活动特征及综合地球物理证据[J]. 地质力学学报,29(6):888−897 doi: 10.12090/j.issn.1006-6616.2023058
引用本文: 宋春华,郁飞,施刚,2023. 上海张堰−金山卫隐伏活动断层活动特征及综合地球物理证据[J]. 地质力学学报,29(6):888−897 doi: 10.12090/j.issn.1006-6616.2023058
SONG C H,YU F,SHI G,2023. The activity characteristics and comprehensive geophysical evidence of the Zhangyan–Jinshanwei concealed active fault in Shanghai, China[J]. Journal of Geomechanics,29(6):888−897 doi: 10.12090/j.issn.1006-6616.2023058
Citation: SONG C H,YU F,SHI G,2023. The activity characteristics and comprehensive geophysical evidence of the Zhangyan–Jinshanwei concealed active fault in Shanghai, China[J]. Journal of Geomechanics,29(6):888−897 doi: 10.12090/j.issn.1006-6616.2023058

上海张堰−金山卫隐伏活动断层活动特征及综合地球物理证据

doi: 10.12090/j.issn.1006-6616.2023058
基金项目: 上海市财政资金项目(18-29780)
详细信息
    作者简介:

    宋春华(1985—),男,高级工程师,从事基础地质调查、地球物理勘探研究。 E-mail:271797119@qq.com

    通讯作者:

    施刚(1964—),男,高级工程师,从事城市地质调查、水文地质与工程地质学研究。 E-mail:454229705@qq.com

  • 中图分类号: P631.4

The activity characteristics and comprehensive geophysical evidence of the Zhangyan–Jinshanwei concealed active fault in Shanghai, China

Funds: This research is financially supported by the Shanghai Municipal Financial Funding Project (Grant No.18-29780).
  • 摘要: 上海城市隐伏断层十分发育,第四纪以来沉积了数百米厚的松散沉积层,受限于其特大城市复杂高干扰环境背景,隐伏断层的探测与活动性特征研究难以取得理想的效果,城市地质安全面临严重风险。文章通过高精度重力面积测量、高分辨率浅层地震勘探等地球物理探测方法,结合周边钻孔地层分层、地应力和年代学测试分析(碳十四和光释光),对张堰−金山卫断层第四纪和现今的活动性开展了探测与研究。结果显示,该断层空间上具有较好的延展性,断层行迹在布格重力异常和地震时间剖面上均有较好的地球物理证据反映。研究认为张堰−金山卫断层为逆冲断层,同时具有继承性和新生性活动特征,总体走向为北西向315°,倾向南西,基岩面断距约10 m,上断点已错断至第四系中更新统内,最新活动时代为中更新世,目前北西向地应力状态易于发生张扭性活动,该断层现今活动性依然需持续关注。此次研究探测思路与成果可为类似城市开展隐伏活动断层探测及活动性分析提供借鉴和参考。

     

  • 图  1  上海金山区位置、基岩地质及地球物理探测测线布置图

    a—上海市断层位置分布简图;b—金山区基岩地质及地球物理探测测线布置图

    Figure  1.  Location, bedrock geology, and geophysical survey line layout of Jinshan District, Shanghai

    (a) Sketch map of fault distribution in Shanghai; (b) Geological and survey line layout of the bedrock in Jinshan District

    图  2  上海及邻近地区1970—2017年(部分地区数据至2019年)地震分布图

    Figure  2.  Earthquake distribution map of Shanghai and its neighboring areas from 1970 to 2017 (Data for some regions is up to the year 2019)

    图  3  布格重力异常等值线图

    Figure  3.  Bouguer gravity anomaly contour map

    图  4  布格重力异常的水平方向导数图

    Figure  4.  Horizontal derivative plots of Bouguer gravity anomalies

    图  5  不同上延高度重力异常断层构造线识别结果图

    Figure  5.  Identification results of gravity anomaly fault layer structural lines at different upward elevations

    图  6  基底反演结果图

    Figure  6.  Inversion results of basement

    图  7  浅层地震勘探测线时间剖面图

    Figure  7.  Time profile of shallow seismic exploration line

    图  8  地应力监测钻孔SDJ-1岩性柱状图及测年结果图

    Figure  8.  Lithological histogram and dating results of Borehole SDJ-1 for ground stress monitoring

    表  1  工作区主要地层物性特征一览表

    Table  1.   List of physical properties of main strata in the work area

    地层及岩性密度/
    (g/cm3
    纵波速度/
    (m/s)
    第四纪黏土 1.64~1.98827~884
    第四纪砂层 1.78~2.031184~1268
    第四纪砂砾层1.87~2.161312~1680
    中生代安山岩2.30~2.701640~2260
    中生代岩浆岩2.61~2.811640~2260
    下载: 导出CSV

    表  2  地应力测量取值结果表

    Table  2.   Results of ground stress measurement values

    序号中心深度/m主应力值/MPaSH/ShSH方向/(°)
    SHShSv
    1143.69.545.412.851.76NW42°
    2145.510.775.882.901.83NE80°
    3155.510.625.753.171.85NW56°
    4157.510.105.613.221.80NW62°
    5164.511.816.383.401.85
    6170.012.916.963.551.85NW46°
    7176.312.296.533.721.88
    注:SH为最大水平主应力,MPa;Sh为最小水平主应力,MPa;Sv为根据上覆岩石埋深计算的垂直主应力,MPa;KHh=SH/Sh,为水平主应力比值,表征地应力状态
    下载: 导出CSV
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出版历程
  • 收稿日期:  2023-04-20
  • 修回日期:  2023-10-30
  • 录用日期:  2023-10-31
  • 预出版日期:  2023-11-07

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