2013年3月3日洱源MS5.5地震前地磁转换函数异常研究

杨杰 李琪 袁伊人

杨杰,李琪,袁伊人. 2021. 2013年3月3日洱源MS5.5地震前地磁转换函数异常研究. 地震学报,43(2):215−226 doi: 10.11939/jass.20200047
引用本文: 杨杰,李琪,袁伊人. 2021. 2013年3月3日洱源MS5.5地震前地磁转换函数异常研究. 地震学报,43(2):215−226 doi: 10.11939/jass.20200047
Yang J,Li Q,Yuan Y R. 2021. Geomagnetic transform function anomaly before the MS5.5 Eryuan earthquake on March 3, 2013. Acta Seismologica Sinica,43(2):215−226 doi: 10.11939/jass.20200047
Citation: Yang J,Li Q,Yuan Y R. 2021. Geomagnetic transform function anomaly before the MS5.5 Eryuan earthquake on March 3, 2013. Acta Seismologica Sinica43(2):215−226 doi: 10.11939/jass.20200047

2013年3月3日洱源MS5.5地震前地磁转换函数异常研究

doi: 10.11939/jass.20200047
基金项目: 国家重点研发计划(2018YFC1503806)和国家自然科学基金(41774085)联合资助
详细信息
    通讯作者:

    李琪,e-mail:darcyli@163.com

  • 中图分类号: P315. 72+1

Geomagnetic transform function anomaly before the MS5.5 Eryuan earthquake on March 3, 2013

  • 摘要: 利用有界影响估计地磁转换函数,分析了2013年3月3日云南洱源MS5.5地震前后滇西北地磁台阵各测点的地磁转换函数及地磁实感应矢量变化特征。结果显示,震前1—2个月云龙测点和洱源测点多个周期的转换函数实部绝对值存在变大—转折—恢复的过程,异常变化幅值超过1倍标准差,其余震中距较大或距离余震区较远的测点震前转换函数无明显异常变化。该结果表明洱源MS5.5地震前地磁转换函数异常范围小于50 km,可能与余震区空间分布有关。

     

  • 图  1  滇西北地磁台阵测点分布及洱源两次MS≥5.0地震的震中和余震分布图

    F1:怒江断裂;F2:澜沧江断裂;F3:维西—乔后断裂;F4:龙蟠—乔后断裂;F5:鹤庆—洱源断裂; F6:小金河—丽江断裂;F7:红河断裂;F8:程海—宾川断裂

    Figure  1.  Distribution of measuring points of geomagnetic array in northwest Yunnan Province and epicenters and aftershocks of two MS≥5.0 earthquakes in Eryuan

    F1:Nujiang fault;F2:Lancangjiang fault;F3:Weixi-Qiaohou fault;F4:Longpan-Qiaohou fault;F5:Heqing-Eryuan fault; F6:Xiaojinhe-Lijiang fault;F7:Honghe fault;F8:Chenghai-Binchuan fault

    图  2  不同求取方法所得地磁转换函数的稳定性对比

    (a) 在水平分量中加入5%高斯白噪声的转换函数实部Ar;(b) 在垂直分量中加入5%高斯白噪声的转换函数实部Ar

    Figure  2.  Comparison of geomagnetic transfer function stability estimated by three different methods of BI estimator,least squares and weighted least squares

    (a) Real component Ar of geomagnetic transfer function result with 5% Gaussian white noise in horizontal component;(b) Real component Ar of geomagnetic transfer function result with 5% Gaussian white noise in vertical component

    图  3  云龙台不同周期T转换函数实部Ar的时间变化曲线

    Figure  3.  The time curves of the real component Ar of transfer function for different periods T at the Yunlong station

    图  4  云龙台不同周期T转换函数实部Br的时间变化曲线

    Figure  4.  The time curves of the real component Br of transfer function at the Yunlong station for different periods T

    图  5  周期T为18.3 min时各测点转换函数实部Br的时间曲线

    Figure  5.  The time curves of Br at the period of 18.3 minutes for five geomagnetic stations

    图  6  不同周期实感应矢量随时间的变化

    Figure  6.  The real induction vector varies with time at different periods

    (a) T=18.3 min;(b) T=25.6 min;(c) T=36.6 min;(d) T =51.2 min

    图  7  测点周期为18.3 min时实感应矢量长度L的时间曲线

    Figure  7.  The time curves of L at the period of 18.3 minutes for five geomagnetic stations

    表  1  滇西北地磁台阵各测点与洱源两次MS≥5.0地震震中的距离

    Table  1.   The distances between the epicenters of two MS≥5.0 earthquakes in Eryuan and the measuring points of the geomagnetic array in northwest Yunnan Province

    测点名称与洱源MS≥5.0地震震中的距离/km测点名称与洱源MS≥5.0地震震中的距离/km
    MS5.5MS5.0MS5.5MS5.0
    云龙 37.15 42.85 牛街 47.12 50.29
    剑川 52.73 52.55 鹤庆 76.53 77.34
    炼铁 8.34 11.52 下关 64.50 55.88
    洱源 22.94 27.38 丽江 116.05 118.71
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  • 收稿日期:  2020-04-02
  • 修回日期:  2020-06-15
  • 网络出版日期:  2021-04-29
  • 刊出日期:  2021-07-07

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