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,43(5):584−594 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,43(5):584−594 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,43(5):584−594 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 Sinica43(5):584−594 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和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 2017 Milin MS6.9 earthquake in Tibet

  • 摘要: 基于中国大陆65 个地磁台站秒采样观测资料,利用地磁垂直强度极化方法提取了2017年西藏米林MS6.9 地震震中及附近区域超低频电磁异常信号并分析其时空演化特征。结果显示:米林MS6.9 地震前在青藏高原出现了大范围的地磁垂直强度极化高值异常,异常过程共持续9天;高值异常开始于2017 年10 月30 日,高值持续3 天之后出现短时间下降,随即转折上升,再次出现高值异常并持续了4 天,在此过程中各高值台站的时序曲线呈现出单峰或双峰的形态。空间分布图显示高值异常在中国大陆西部区域反复出现,尤其是在青藏高原巴颜喀拉地块与羌塘地块的交界处。异常呈“出现—扩大—收缩—消失—扩大—消失”的演化过程,10月31日异常面积达到最大值。异常过程结束后10天发生了西藏米林MS6.9地震,震中距离10 月31 日异常阈值线5 km。综合分析认为,此次异常与米林地震具有较强的时空相关性,是可靠的地震电磁前兆异常。

     

  • 图  1  全国地磁计算台站分布图

    Figure  1.  Distribution of national geomagnetic stations in China

    图  2  地磁垂直强度极化方法计算过程(以青海都兰台为例)

    (a) 极化值;(b) 极化值的傅里叶拟合;(c) 极化值与其傅里叶拟合的残差值;(d) 残差的5日滑动平均值

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

    (a) Original polarization values;(b) Fourier fitting results of Fig. (a);(c) The difference between Fig. (a) and Fig. (b);(d) Five-day moving average of Fig. (c)

    图  3  2017年10—12月部分地磁垂直强度极化异常台站时序曲线

    Figure  3.  Time series of some stations with geomagnetic vertical strength polarization anomaly from October 1,2017 to December 31,2017

    图  4  2017年10月28日至11月8日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 from October 28 to November 8,2017

    4  2017年10月28日至11月8日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 from October 28 to November 8,2017

    图  5  异常参数统计

    (a) 异常台站占比;(b) 异常面积;(c) 异常幅值最大值;(d) 震中距

    Figure  5.  Statistical graph of abnormal parameters

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

    图  6  极化高值异常期间Dst指数(a)和Kp指数(b)的变化情况

    Figure  6.  Variation of Dst and Kp indices during polarization high value abnormal period

    表  1  异常参数统计表

    Table  1.   Statistical table of abnormal parameters

    异常
    日期
    异常面积
    /(104 km2
    异常台
    个数
    计算台
    个数
    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%0.40380
    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
  • 刊出日期:  2021-09-30

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