九寨沟MS7.0地震地电阻率变化时空演化分析

王同利, 崔博闻, 叶青, 李菊珍, 王丽红, 童琼. 2020. 九寨沟MS7.0地震地电阻率变化时空演化分析. 地球物理学报, 63(6): 2345-2356, doi: 10.6038/cjg2020N0454
引用本文: 王同利, 崔博闻, 叶青, 李菊珍, 王丽红, 童琼. 2020. 九寨沟MS7.0地震地电阻率变化时空演化分析. 地球物理学报, 63(6): 2345-2356, doi: 10.6038/cjg2020N0454
WANG TongLi, CUI BoWen, YE Qing, LI JuZhen, WANG LiHong, TONG Qiong. 2020. Temporal-spatial distribution of apparent resistivity before and after the Jiuzhaigou MS7.0 earthquake. Chinese Journal of Geophysics (in Chinese), 63(6): 2345-2356, doi: 10.6038/cjg2020N0454
Citation: WANG TongLi, CUI BoWen, YE Qing, LI JuZhen, WANG LiHong, TONG Qiong. 2020. Temporal-spatial distribution of apparent resistivity before and after the Jiuzhaigou MS7.0 earthquake. Chinese Journal of Geophysics (in Chinese), 63(6): 2345-2356, doi: 10.6038/cjg2020N0454

九寨沟MS7.0地震地电阻率变化时空演化分析

  • 基金项目:

    中国地震局震情跟踪面上项目(2020020403), 中国地震实验场项目(2019CSES0113)及冬奥会保障晋冀蒙监测能力提升项目资助

详细信息
    作者简介:

    王同利, 女, 高级工程师, 主要从事地震电磁研究和小震定位工作.E-mail:416991552@qq.com

  • 中图分类号: P319

Temporal-spatial distribution of apparent resistivity before and after the Jiuzhaigou MS7.0 earthquake

  • 本文应用归一化变化速率(NVRM)方法,研究了2017年九寨沟MS7.0地震周边800 km范围内25个地电阻率台站2012—2018年的连续观测数据,分析了震中区周围的地电阻率时、空演化过程.结果显示:(1)25个台站中共有14个台站在震前出现了地电阻率变化,结合本次地震震源机制等分析其时空变化,认为邻近地震破裂带的临夏、通渭、武都和宝鸡台地电阻率在震前出现了下降—折返回升型的变化,符合前人已总结的强地震前地电阻率的变化过程.(2)地震发生前震中区周围大区域内出现了地电阻率负异常变化,且以震中区为中心呈条带分布,异常区的长轴方向与地震断裂带走向或地震烈度分布的长轴方向几乎垂直,与地震主压应力轴方向吻合.本文认为九寨沟MS7.0强震发生之前,震中区周围出现的区域性地电阻率异常空间丛集现象是很好的中期和短临前兆;地电阻率震前异常动态演化、各向异性等特征对认识本次强震发震断层活动以及震源区应力场分布有启示意义.

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  • 图 1 

    九寨沟MS7.0地震区域构造与余震分布

    Figure 1. 

    Structure and aftershock distribution of MS7.0 earthquake in Jiuzhaigou

    图 2 

    九寨沟MS7.0地震周边地电阻率台站分布(▲:台站,●:震中)

    Figure 2. 

    Apparent resistivity station distribution surrounding of MS7.0 earthquake in Jiuzhaigou (▲ :station, ●:epicenter)

    图 3 

    震中区周边地电阻率月均值和NVRM曲线

    Figure 3. 

    Mouth average data and NVRM curve of apparent resistivity around the epicenter

    图 4 

    山西大同台和代县台地电阻率月均值曲线和NVRM曲线

    Figure 4. 

    Mouth average data and NVRM curve of apparent resistivity at Datong and Daixian station

    图 5 

    九寨沟地震前地电阻率NVRM时空演化

    Figure 5. 

    NVRM spatial evolution of apparent resistivity before the Jiuzhaigou earthquake

    图 6 

    青海门源地震前地电阻率NVRM时空演化

    Figure 6. 

    NVRM spatial evolution of apparent resistivity before the Menyuan-Qinghai earthquake

    图 7 

    九寨沟MS7.0地震和ML≥4(a)、ML≥3(b)余震震源机制解

    Figure 7. 

    Focal mechanisms of the MS7.0 Jiuzhaigou earthquake and its ML≥4(a)、ML≥3 (b)aftershocks

    图 8 

    九寨沟地震周边台站主压应力和地电阻率布极方位角

    Figure 8. 

    The azimuth of principal compressive stress and apparent resistivity arrays around of Jiuzhaigou earthquake

    图 9 

    汶川地震前地电阻率EW测向NVRM时空演化

    Figure 9. 

    NVRM spatial evolution of EW apparent resistivity before the Wenchuan earthquake

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收稿日期:  2019-12-31
修回日期:  2020-03-31
上线日期:  2020-06-05

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