2017年西藏米林MS6.9地震前地磁垂直强度极化异常特征

李霞 冯丽丽 赵玉红 刘磊 苟智栋 樊文杰 贺曼秋 廖晓峰 艾萨·伊斯马伊力 

李霞,冯丽丽,赵玉红,刘磊,苟智栋,樊文杰,贺曼秋,廖晓峰,艾萨·伊斯马伊力 . 2021. 2017年西藏米林MS6.9地震前地磁垂直强度极化异常特征. 地震学报,0(0):1−12 doi: 10.11939/jass.20200196
引用本文: 李霞,冯丽丽,赵玉红,刘磊,苟智栋,樊文杰,贺曼秋,廖晓峰,艾萨·伊斯马伊力 . 2021. 2017年西藏米林MS6.9地震前地磁垂直强度极化异常特征. 地震学报,0(0):1−12 doi: 10.11939/jass.20200196
Li X,Feng L L,Zhao Y H,Liu L,Gou Z D,Fan W J,He M Q,Liao X F,Aisa Yisimayili. 2021. Anomalous characteristics of geomagnetic vertical strength polarization before the Milin MS6.9 earthquake in 2017. Acta Seismologica Sinica,0(0):1−12 doi: 10.11939/jass.20200196
Citation: Li X,Feng L L,Zhao Y H,Liu L,Gou Z D,Fan W J,He M Q,Liao X F,Aisa Yisimayili. 2021. Anomalous characteristics of geomagnetic vertical strength polarization before the Milin MS6.9 earthquake in 2017. Acta Seismologica Sinica0(0):1−12 doi: 10.11939/jass.20200196

2017年西藏米林MS6.9地震前地磁垂直强度极化异常特征

doi: 10.11939/jass.20200196
基金项目: 中国地震局科技星火计划(XH21037Y)、中国地震局震情跟踪定向工作任务(2021010413,2021010308)、青海省地震局格尔木青藏高原内部地球动力学野外科学观测研究站专项课题与青海省地震局基金课题(2021A03)联合资助
详细信息
    作者简介:

    李霞(1988—),女,硕士,陕西人,工程师,主要从事地震预测预报分析工作。E-mail:lxqhdz@163.com

    通讯作者:

    李霞,e-mail:lxqhdz@163.com

  • 中图分类号: P315. 72+1

Anomalous characteristics of geomagnetic vertical strength polarization before the Milin MS6.9 earthquake in 2017

  • 摘要: 基于中国大陆65套地磁观测台站资料,通过地磁垂直强度极化方法提取震源区电磁异常信号并分析异常的时空演化特征。分析认为2017年西藏米林MS6.9地震前地磁资料出现了大范围同步极化异常现象,从2017年10月30日起,时序曲线计算结果呈现出单峰或双峰的高值形态,异常持续3天,在、平静两天后,随即又出现高值异常,异常持续4天;此次异常的分布面积呈现出增大—收缩—消失—增大—消失的演化过程,高值异常重复出现地区位于中国大陆内西部区域,尤其青藏高原巴颜喀拉和羌塘地块交界处。此次异常过程共持续9天,19天后西藏米林发生MS6.9地震,震中位于2017年10月31日异常等值线的零值阈值线5 km处。综合分析认为,地磁垂直强度极化高值异常与外源场无关,反映的是地下电磁信号,且基于该方法的高值异常对预测中国大陆中强地震有一定指示意义。

     

  • 图  1  全国地磁计算台站分布图

    Figure  1.  Distribution map of national geomagnetic stations

    图  2  地磁垂直强度极化方法计算过程(青海都兰台)

    (a)极化值;(b)极化富氏拟合值;(c)极化与富氏拟合残差值;(d)极化与富氏拟合残差5日滑动平均值

    Figure  2.  The calculation process of geomagnetic vertical intensity polarization method (Data from Dulan observation station)

    (a) The value of geomagnetic vertical intensity polarization;(b) Fourier fitting calculation results;(c) The residuals of geomagnetic vertical intensity polarization and flourier fitting;(d) The residuals after 5-day moving average

    图  3  部分地磁垂直强度极化异常台站时序曲线(20171001-20171231)

    Figure  3.  Time series of some geomagnetic vertical strength polarization anomaly stations

    图  4  2017年10月全国地磁垂直强度极化异常空间演化过程

    Figure  4.  Spatial evolution process of geomagnetic vertical intensity polarization anomaly in October 2017

    4  2017年10月全国地磁垂直强度极化异常空间演化过程

    4.  Spatial evolution process of geomagnetic vertical intensity polarization anomaly in October 2017

    图  5  异常参数统计图

    (a)异常台站占比;(b)异常面积;(c)异常幅最大值;(d)异常幅最大值

    Figure  5.  Statistical graph of abnormal parameters

    (a) The proportion of abnormal stations;(b) Anomalous area distribution; (c) Maximum anomalous amplitude;(d) The epicentral distance

    图  6  异常时间段与Dst指数、KP指数情况

    Figure  6.  Dst and KP index information during abnormal period

    表  1  异常参数统计表

    Table  1.   Statistical table of abnormal parameters

    异常时间异常面积/(104km2异常台点数计算台点数异常占比异常最大幅值震中距/km
    10月28日01641.56%0.021540
    10月29日00640--
    10月30日165.2126418.75%0.4380
    10月31日378.9316448.44%0.871980
    11月1日70.986512.31%1.06390
    11月2日00650--
    11月3日00650--
    11月4日2.31631.59%0.862300
    11月5日51.1106415.63%1.26970
    11月6日285.3226334.92%1.222060
    11月7日01641.56%0.071540
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  • 收稿日期:  2020-12-03
  • 修回日期:  2021-02-26
  • 网络出版日期:  2021-07-30

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