2021年青海玛多MS7.4地震前大武台地电场优势方位角异常特征分析

赵玉红 苏维刚 冯丽丽 李霞 刘磊 孙玺皓

赵玉红,苏维刚,冯丽丽,李霞,刘磊,孙玺皓. 2023. 2021年青海玛多MS7.4地震前大武台地电场优势方位角异常特征分析. 地震学报,45(1):76−83 doi: 10.11939/jass.20210162
引用本文: 赵玉红,苏维刚,冯丽丽,李霞,刘磊,孙玺皓. 2023. 2021年青海玛多MS7.4地震前大武台地电场优势方位角异常特征分析. 地震学报,45(1):76−83 doi: 10.11939/jass.20210162
Zhao Y H,Su W G,Feng L L,Li X,Liu L,Sun X H. 2023. Characteristics of the dominant azimuth anomalies of geoelectric field at Dawu station before MS7.4 Maduo,Qinghai earthquake in 2021. Acta Seismologica Sinica,45(1):76−83 doi: 10.11939/jass.20210162
Citation: Zhao Y H,Su W G,Feng L L,Li X,Liu L,Sun X H. 2023. Characteristics of the dominant azimuth anomalies of geoelectric field at Dawu station before MS7.4 Maduo,Qinghai earthquake in 2021. Acta Seismologica Sinica45(1):76−83 doi: 10.11939/jass.20210162

2021年青海玛多MS7.4地震前大武台地电场优势方位角异常特征分析

doi: 10.11939/jass.20210162
基金项目: 青海省地震科学基金(2022A01)、2021年度震情跟踪定向工作任务(2021010414)和中国地震局地震科技星火计划(XH20063Y)联合资助
详细信息
    通讯作者:

    赵玉红,硕士,工程师,主要从事地震预测预报,e-mail: zhaoyuhong0123@163.com

  • 中图分类号: P139.722

Characteristics of the dominant azimuth anomalies of geoelectric field at Dawu station before MS7.4 Maduo,Qinghai earthquake in 2021

  • 摘要: 为了深入了解2021年5月22日青海省玛多MS7.4地震前是否存在地震电信号,本文利用地电场优势方位角方法对大武地电场的原始资料进行了分析,获得了玛多地震前震中附近场地的岩体裂隙结构变化特征,并结合本次地震震中500 km范围内八个地电场台站的岩体裂隙结构变化和该台记录到的以往震例中大武台地电场优势方位角异常变化与中强地震之间的关系进行了综合分析。结果显示:大武台新旧两套地电场数据的地电场优势方位角在震前11个月出现了显著的同步偏转现象,其中大武旧台在震前两个月优势方位角再次出现大幅度上升,异常特征主要表现为优势方位角出现同步快速偏转,最大偏转达到45°—90°;处于同一次级地块的甘孜台、玛曲台与大武台出现准同步异常现象,而其它次级地块上的台站均无异常出现,表明异常响应受到区域构造的影响。再结合大武台地电场使用该方法分析的以往震例表明:大武台的地电场优势方位角异常在中强地震前具有较好的中短期指示意义。

     

  • 图  1  玛多MS7.4地震震中及附近地电场台站分布

    Figure  1.  Location of the epicenter of Maduo MS7.4 earthquake and distribution of the geoelectric stations

    图  2  大武地震台(旧)地电场观测布极图

    Figure  2.  Electrode distribution of electric field (old site) of Dawu seismic station

    图  3  2020年以来大武台地电场旧(a)、新(b)台的地电场优势方位角变化

    Figure  3.  The variation of the dominant azimuth of geoelectric field at old (a) and new (b) sites of Dawu station since 2020

    图  4  2020年以来甘孜(a)、玛曲台(b)的地电场方位角异常变化

    Figure  4.  The variation of the dominant azimuth angle based on geoelectric field data at the seismic stations Garze (a) and Maqu (b) since 2020

    表  1  玛多MS7.4地震前震中500 km内地电场优势方位角的变化特征

    Table  1.   Variation characteristic of the dominant azimuth based on geoelectric field before MS7.4 Maduo earthquake within 500 km

    地电场台站震中距/km异常形态异常出现日期
    年-月-日
    开始观测日期
    年-月-日
    大武(旧)170快速偏转,Δα≈45°2020-05-102014-12-12
    大武(新)169Δα增大至90° 2020-05-08 2020-01-01
    玛曲335Δα增大至60° 2020-05-04 2014-03-22
    甘孜360快速偏转,Δα≈90° 2020-05-15 2017-12-01
    都兰190无异常 2014-12-01
    白水河355无异常 2015-01-01
    金银滩256无异常 2019-06-04
    门源地电场433无异常2020-01-01
    下载: 导出CSV

    表  2  大武台周围500 km范围内MS5.5地震前地电场优势方位角的变化特征

    Table  2.   Variation characteristic of dominant azimuth based on geoelectric field before MS5.5 earthquakes within 500 km of Dawu station

    台站发震日期
    年-月-日
    发震地点MS震中距/km异常异常出现月份
    年-月
    备注
    大武台2016-01-21门源6.4380Δα增大2015-10多台同步
    2016-10-17杂多6.2500震前2个月快速偏转恢复 2016-08附近仅一台
    2017-08-08九寨沟7.0360
    2019-10-28夏河5.7240快速偏转2019-06多台同步
    2020-04-01石渠县5.6200 震前3个月快速偏转恢复 2020-01多台同步
    下载: 导出CSV
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出版历程
  • 收稿日期:  2021-10-20
  • 修回日期:  2022-05-20
  • 网络出版日期:  2023-01-04
  • 刊出日期:  2023-01-17

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