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2016年门源MS6.4地震前兆异常演化特征

苏维刚, 王培玲, 冯丽丽, 马震, 赵玉红

苏维刚，王培玲，冯丽丽，马震，赵玉红. 2020. 2016年门源 M S6.4地震前兆异常演化特征. 地震学报，42（1）：24−33. doi：10.11939/jass.20190108. DOI: 10.11939/jass.20190108
引用本文: 苏维刚，王培玲，冯丽丽，马震，赵玉红. 2020. 2016年门源 M S6.4地震前兆异常演化特征. 地震学报，42（1）：24−33. doi：10.11939/jass.20190108. DOI: 10.11939/jass.20190108
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Su W G，Wang P L，Feng L L，Ma Z，Zhao Y H. 2020. Evolution characteristics of precursory anomalies before the M S6.4 Menyuan，Qinghai，earthquake in 2016. Acta Seismologica Sinica，42（1）：24−33. doi：10.11939/jass.20190108. DOI: 10.11939/jass.20190108
Citation: Su W G，Wang P L，Feng L L，Ma Z，Zhao Y H. 2020. Evolution characteristics of precursory anomalies before the M S6.4 Menyuan，Qinghai，earthquake in 2016. Acta Seismologica Sinica，42（1）：24−33. doi：10.11939/jass.20190108. DOI: 10.11939/jass.20190108
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2016年门源MS6.4地震前兆异常演化特征

  • 中国西宁 810001 青海省地震局

基金项目: 青海省地震科技基金（2019B08）和中国地震局地震科技星火计划专项（XH20062）联合资助
详细信息
    通讯作者:

    冯丽丽: e-mail：liuwbst@163.com

  • 中图分类号: P315.72

Evolution characteristics of precursory anomalies before the MS6.4 Menyuan，Qinghai，earthquake in 2016

  • Qinghai Earthquake Agency，Xining 810001，China

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    摘要
  • 摘要:

    本文对2016年青海门源MS6.4地震之前震中周边前兆台站的观测资料进行了回顾性分析，结果显示有15项定点前兆测项震前呈异常，主要集中在距震中300 km的范围内，其中形变类异常最先出现，之后以流体类异常为主，临震阶段以电磁类异常为主。震前前兆异常的演化在时空上具有阶段性和迁移性，震前异常出现时间随震中距的变化划分为三个阶段：α阶段为远源场前兆异常从震中向外围扩散的过程，异常主要出现在震前390—630天；β阶段为前兆异常大范围分布，主要出现在震前100—200天；γ阶段主要为近源场异常向外扩散。

    Abstract:

    By retrospectively analyzing and sorting out the anomalies before the 2016 Menyuan MS6.4 earthquake, this paper discusses the spatio-temporal evolution characteristics of precursory anomalies before the earthquake. The results show that the anomalies are mainly concentrated in the region within 300 km around the epicenter. Among all kinds of the anomalies, deformation anomalies appeared first, followed by medium- and short-term fluid anomalies, and electromagnetic anomalies in the impending earthquake stage. The evolution of precursory anomalies appears as stage and migration characteristics in space-time. The variation of pre-earthquake anomalies can be divided into α, β, γ three stages. During the α stage, the precursory anomalies spread from the epicenter to the periphery in the far source field mainly 390−630 days before earthquakes. During the β stage, the precursory anomalies are widely distributed in 100−200 days before earthquakes. During the γ stage, the precursory anomalies of the near-field source spread outwards.

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  • 图  1   门源台周边断裂分布

    Figure  1.   Fault distribution around Menyuan station

    下载: 全尺寸图片 幻灯片

    图  2   门源MS6.4震中附近地区观测台站及前兆异常分布图

    Figure  2.   Distribution of monitoring stations and precursory anomalies before the Menyuan MS6.4 earthquake

    下载: 全尺寸图片 幻灯片

    图  3   门源地震前前兆异常时间进程

    Figure  3.   The time process of precursory anomalies before the Menyuan earthquake

    下载: 全尺寸图片 幻灯片

    图  4   门源地震前异常时间随震中距的阶段变化

    Figure  4.   Stage variation of anomaly time with epicentral distance before the Menyuan earthquake

    下载: 全尺寸图片 幻灯片

    图  5   玉树（a）和岷嶂（b）地震前异常出现时间随震中距的阶段变化

    Figure  5.   Stage-variation of anomaly time with epicentral distance before Yushu （a） and Minzhang （b） earthquakes

    下载: 全尺寸图片 幻灯片

    表  1   门源MS6.4地震前兆异常分布

    Table  1   Distribution of precursory anomalies of the Menyuan MS6.4 earthquake

    震中距/km异常项异常台站所占比例
    100220%
    100—200329%
    200—300320%
    ＞300720%
    下载: 导出CSV

    表  2   门源MS6.4地震前兆异常统计

    Table  2   Statistics on precursory anomalies of the Menyuan MS6.4 earthquake

    序号异常项目台站异常出现日期
    　年-月-日    		异常结束日期
    　年-月-日    		异常判据震中距
    /km    		震例
    1水平摆倾斜门源2015-08-182015-08-27转折变化 31乌兰MS5.1，祁连MS5.2，门源MS6.4
    2垂直摆倾斜门源2015-08-182015-08-27转折变化 31乌兰MS5.1，祁连MS5.2，门源MS6.4
    3静水位平安2015-09-012016-01-01年变异常变化140门源MS6.4
    4钻孔倾斜湟源2015-11-012016-02-01持续北倾130门源MS6.4
    5气氡乐都2015-12-012016-03-01年变异常变化140门源MS6.4
    6钻孔倾斜寺滩2016-01-172016-01-24加速北倾203门源MS6.4
    7洞体应变白银2015-01-012015-10-01年变异常变化250玉树MS7.1，门源MS6.4
    8短基线伸缩仪NS分量兰州十
    里店    		2014-05-012016-01-01趋势转折258门源MS6.4
    9水温海原2015-08-012015-11-01转折上升350汶川MS8.0，阿拉善MS5.8，门源MS6.4
    10气氡嘉峪关2015-09-01未结束高值变化392玉门MS5.9，民乐MS6.0，海西MS6.3，
    海西MS6.4，门源MS6.4
    11钻孔应变格尔木2015-01-012016-02-01年变异常变化640海西MS6.4，玉树MS7.1，门源MS6.4
    12水平摆倾格尔木2015-01-012016-02-01趋势性转折640海西MS6.3，海西MS6.4，
    玉树MS7.1，门源MS6.4
    13深井地电天水2016-01-052016-01-21加速上升522芦山MS7.0，岷嶂MS6.6，门源MS6.4
    14地磁2015-12-232015-12-23超阈值岷嶂MS6.6，门源MS6.4，
    阿拉善MS5.0，九寨沟MS7.0
    15水温玉树2015-10-072015-11-17“V”形变化756尼泊尔MS8.0，玉树MS7.1，
    门源MS6.4，杂多MS6.2
    下载: 导出CSV
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出版历程
  • 收稿日期:  2019-06-18
  • 修回日期:  2019-08-07
  • 网络出版日期:  2020-04-01
  • 刊出日期:  2019-12-31

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