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基于余震分析的宏观震中、地震影响场方向和极震区初步修正

孙艳萍 张苏平 朱瑞 马小平 刘岸果

孙艳萍, 张苏平, 朱瑞, 马小平, 刘岸果. 基于余震分析的宏观震中、地震影响场方向和极震区初步修正[J]. 地震科学进展, 2021, (7): 309-314. doi: 10.3969/j.issn.2096-7780.2021.07.004
引用本文: 孙艳萍, 张苏平, 朱瑞, 马小平, 刘岸果. 基于余震分析的宏观震中、地震影响场方向和极震区初步修正[J]. 地震科学进展, 2021, (7): 309-314. doi: 10.3969/j.issn.2096-7780.2021.07.004
Yanping Sun, Suping Zhang, Rui Zhu, Xiaoping Ma, Anguo Liu. Preliminary correction of the macro epicenter,the direction of the earthquake influence field and the meizoseismal area based on aftershock analysis[J]. Progress in Earthquake Sciences, 2021, (7): 309-314. doi: 10.3969/j.issn.2096-7780.2021.07.004
Citation: Yanping Sun, Suping Zhang, Rui Zhu, Xiaoping Ma, Anguo Liu. Preliminary correction of the macro epicenter,the direction of the earthquake influence field and the meizoseismal area based on aftershock analysis[J]. Progress in Earthquake Sciences, 2021, (7): 309-314. doi: 10.3969/j.issn.2096-7780.2021.07.004

基于余震分析的宏观震中、地震影响场方向和极震区初步修正

doi: 10.3969/j.issn.2096-7780.2021.07.004
基金项目: “十三五”国家重点研发计划项目(2017YFC1500905)资助
详细信息
    作者简介:

    孙艳萍(1986-),女,高级工程师,主要从事地震应急工作。E-mail:yrrgyoyo@163.com

    通讯作者:

    张苏平(1965-),女,研究员,主要从事地震应急工作。E-mail:zhangsp@gssb.gov.cn

  • 中图分类号: P315.9

Preliminary correction of the macro epicenter,the direction of the earthquake influence field and the meizoseismal area based on aftershock analysis

  • 摘要: 在地震应急初期评估中,宏观震中、影响场方向和极震区的判断准确与否,直接影响评估结果的准确性和政府及有关部门的救援工作。本文收集甘肃及周边近几年MS6.5以上地震的12 h内余震序列、震源机制解信息和居民点等数据,通过分时间段进行余震质心计算、趋势回归、震源机制解分析等,对宏观震中位置、地震影响场方向、极震区范围等要素的修正方法进行了初步研究,为地震应急救援工作的快速开展提供依据。

     

  • 图  1  岷县漳县地震宏、微观震中与居民点分布图

    Figure  1.  Distribution of macro and micro epicentre and settlements of Minxian-Zhangxian earthquake

    图  2  岷县漳县MS6.6地震12 h内余震一元线性回归拟合结果

    Figure  2.  One-variable linear regression fitting results of aftershocks within 12 hours of the Minxian-Zhangxian MS6.6 earthquake

    图  3  四川九寨沟MS7.0地震12 h余震分布图

    Figure  3.  12-hour aftershock distribution of the Jiuzhaigou MS7.0 earthquake in Sichuan

    表  1  近年来甘肃及周边MS6.5以上地震宏观震中和微观震中及其差异

    Table  1.   Macro epicenters,micro epicenters and their deviation distances of recent MS6.5 earthquakes in Gansu and surrounding areas

    地震时间
    (年-月-日)
    地点震级(M宏观震中 微观震中偏离距离/km
    经度/°E纬度/°N经度/°E纬度/°N
    2008-05-12四川汶川8.0104.231.6 103.4231.01约110
    2010-04-14青海玉树7.196.8533.0696.5933.22约30
    2013-04-20四川芦山7.0102.9830.26103.030.3约5
    2013-07-22甘肃岷县漳县6.6104.1334.55104.234.5约10
    2017-08-08四川九寨沟7.0103.84333.217103.8233.2约4
    下载: 导出CSV

    表  2  各震例12 h内余震质心与宏观震中距离

    Table  2.   The distance between the centroid of aftershocks and the macro-epicenter within 12 hours of each case

    地震余震判定与宏观震中
    距离/km
    时间段/h经度/°E纬度/°N
    岷县漳县2104.2034.548.4
    4104.2034.547.4
    6104.1934.547.3
    8104.2034.547.4
    10104.2034.547.3
    12104.1934.547.3
    玉树297.0133.0317.7
    497.0133.0119.0
    697.0333.0120.7
    897.0333.0021.4
    1097.0432.9921.9
    1297.0432.9922.4
    汶川2103.7331.3161.3
    4103.7031.3363.0
    6103.8331.4445.3
    8103.7231.3759.7
    10103.7231.3659.8
    12103.7031.3562.0
    九寨沟2103.8133.232.9
    4103.8233.222.5
    6103.8233.222.6
    8103.8233.222.3
    10103.8233.221.9
    12103.8233.222.0
    下载: 导出CSV

    表  3  不同机构对岷县漳县MS6.6地震震源机制解的研究结果

    Table  3.   The research results of the focal mechanism solution of the Minxian-Zhangxian MS6.6 earthquake by different institutions

    机构节面Ⅰ节面Ⅱ震源
    深度/km
    走向/°倾角/°滑动角/°走向/°倾角/°滑动角/°
    IGPCEA18047120 320516220
    IGCEA188.458.8142301.357.3386
    USGS17760108324346215
    GSSB19554149305654013.5
    下载: 导出CSV

    表  4  芦山MS7.0地震和九寨沟MS7.0地震长短轴及面积

    Table  4.   Long and short axes and area of the MS7.0 Lushan earthquake and the Jiuzhaigou MS7.0 earthquake

    地震烈度长轴/km短轴/km面积/km2
    芦山MS7.0
    地震
    2311208
    58351418
    112664029
    19012813027
    九寨沟MS7.0
    地震
    1810139
    4426778
    90613372
    18513014006
    下载: 导出CSV
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出版历程
  • 收稿日期:  2021-04-08
  • 修回日期:  2021-05-17
  • 刊出日期:  2021-07-25

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