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2010—2016年南北地震带岩石圈磁场变化分析

冯丽丽

引用本文: 冯丽丽. 2019. 2010—2016年南北地震带岩石圈磁场变化分析. 地震学报, 41(2): 239-248. doi: 10.11939/jass.20180059 shu
Citation:  Feng Lili. 2019. Lithospheric geomagnetic field variation in the North-South Seismic Belt from 2010 to 2016. Acta Seismologica Sinica41(2): 239-248. doi: 10.11939/jass.20180059 shu

2010—2016年南北地震带岩石圈磁场变化分析

    通讯作者: 冯丽丽, ynufll@sina.com
摘要: 利用小波分解对2010—2016年南北地震带(21°N—37°N,97°E—109°E)区域6期岩石圈磁场年变化数据进行处理,并对2011年6月以来该区域发生的MS≥5.0强震震中区的岩石圈磁场变化空间分布及时间演化特征进行了系统分析。结果显示:震级与岩石圈磁场ΔX,ΔY,ΔZ分量变化的相关系数分别为0.26,?0.26,0.15,即二者无显着相关性;震中处岩石圈磁场分量变化的最大幅值分别为18.46,14.98,?15.54 nT。对岩石圈磁场变化进行小波分解的结果表明:MS7.0地震前两年出现显着基底异常,其尺度可能达到上千千米;MS6.0地震前一年也出现显着基底异常,但异常尺度较小;MS5.0地震前尚未观测到明确的基底或中层异常。

English

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  • 图 1  2010年南北地震带第一期流动地磁测点分布图

    Figure 1.  Distribution of the first issue of geomagnetic observatories in the North-South Seismic Belt in 2010

    图 2  2010—2016年南北地震带岩石圈磁场ΔZ分量变化及ΔZ的浅表、中层和基底变化

    Figure 2.  Lithospheric geomagnetic field component ΔZ variation and ΔZ variation of surface layer,middle layer and bottom layer during 2010 to 2016 in the North-South Seismic Belt

    期数地震
    编号
      发震时间参考位置东经/°北纬/°MSΔX变化
    /nT
    ΔY变化
    /nT
    ΔZ变化
    /nT
    年-月-日  时:分:秒
    1
    (2010—2011年)
    1-12011-08-09 19:50:17云南腾冲98.7025.005.2?3.56?12.47?15.54
    1-22011-11-01 05:58:05四川青川105.3032.605.2?6.96?6.26?0.59
    1-32012-06-24 15:59:34云南宁蒗100.6927.715.7?3.834.01?4.75
    2
    (2011—2012年)
    2-12012-09-07 11:19:42云南彝良103.9727.515.75.526.106.66
    2-22012-09-07 12:16:30云南彝良104.0327.565.63.765.917.40
    2-32013-01-18 20:42:50四川白玉99.4030.955.59.943.98?0.14
    2-42013-03-03 13:41:16云南洱源99.7225.935.53.731.74?4.68
    2-52013-04-20 08:02:48四川芦山102.9930.307.05.320.491.69
    3
    (2012—2013年)
    3-12013-07-22 07:45:56甘肃岷县104.2134.546.77.19?10.908.27
    3-22013-08-28 04:04:52四川得荣99.3328.205.28.130.83?12.07
    3-32013-08-31 08:04:16云南香格里拉99.3528.155.97.710.78?10.70
    3-42014-04-05 06:40:33云南永善103.5728.145.17.32?0.647.37
    3-52014-05-24 04:49:23云南盈江97.8024.905.611.202.98?6.75
    3-62014-05-30 09:20:12云南盈江97.8025.006.110.232.24?6.94
    4
    (2013—2014年)
    4-12014-08-03 16:30:10云南鲁甸103.3027.106.56.30?14.980.84
    4-22014-10-01 09:23:27四川越西102.8028.405.01.612.326.96
    4-32014-10-07 21:49:39云南景谷100.5023.406.64.50?6.62?0.45
    4-42014-11-22 16:55:25四川康定101.6930.266.36.25?7.386.83
    4-52014-08-17 06:07:58云南永善103.5028.105.0?2.76?4.08?6.32
    4-62015-03-01 18:24:40云南沧源98.9023.505.5?3.192.3214.05
    5
    (2014—2015年)
    5-12015-10-30 19:26:39云南昌宁99.5025.065.1?5.55?6.45?0.14
    5-22016-05-18 00:48:47云南云龙99.5326.105.01.90?3.63?10.91
    6
    (2015—2016年)
    6-12016-09-23 01:23:11四川理塘99.6130.105.118.46?0.505.65
    6-22017-03-27 07:55:00云南漾濞99.8025.895.15.562.738.51

    表 1  主要MS≥5.0地震震中的岩石圈磁场变化统计

    Table 1.  Lithospheric magnetic field variation in the epicenters of main earthquakes with MS≥5.0

    下载: 导出CSV
    地震
    编号
    MSΔX变化/nT ΔY变化/nT ΔZ变化/nT
    浅表中层基底浅表中层基底浅表中层基底
    1-15.24.890.60?9.92 ?2.74?1.73?8.16 ?5.70?2.64?7.10
    1-25.21.33?1.13?6.32?5.44?0.29?1.49?0.95?0.512.69
    1-35.71.55?0.04?4.153.403.34?2.09?1.543.25?5.23
    2-15.72.643.331.340.28?1.918.76?0.86?8.0016.05
    2-25.61.403.301.671.26?2.328.510.40?8.0615.66
    2-35.5?0.671.858.61?0.811.602.24?0.535.80?4.97
    2-45.51.893.664.073.00?7.8210.65?0.10?5.962.92
    2-57.0?3.90?1.498.351.32?3.164.67?1.016.03?3.76
    3-16.71.372.272.58?0.35?3.32?7.734.562.313.02
    3-25.24.573.410.36?1.21?3.895.69?5.93?3.121.52
    3-35.94.352.980.40?1.05?3.835.71?6.12?3.051.38
    3-45.1?1.546.032.527.32?3.69?4.015.481.86?0.39
    3-55.66.632.861.24?0.48?3.686.55?2.28?3.28?1.17
    3-66.16.522.611.10?0.58?4.136.43?2.39?3.37?1.35
    4-16.53.412.300.39?1.44?6.43?5.890.83?0.410.26
    4-25.00.020.021.96?2.655.05?0.41?1.322.664.59
    4-36.63.591.59?1.21?3.49?6.814.17?8.57?1.709.75
    4-46.32.39?0.252.45?1.77?3.763.373.57?2.207.65
    4-55.0?0.91?1.970.46?3.593.01?3.53?7.21?0.942.15
    4-65.5?1.470.22?2.49?3.89?2.619.76?0.63?0.1415.22
    5-15.11.95?1.74?4.84?2.47?2.89?0.72?2.093.05?2.49
    5-25.04.71?0.62?4.83?3.31?1.03?0.61?1.83?1.80?2.43
    6-15.11.20?2.5812.561.613.23?5.631.40?0.277.17
    6-25.1?7.41?4.9116.265.29?3.213.236.89?0.703.86
    绝对值的平均值/nT2.922.164.172.453.455.003.002.965.12

    表 2  主要MS≥5.0地震震中处岩石圈磁场的浅表、中层及基底的变化统计

    Table 2.  Variation of lithospheric magnetic field for surface layer,middle layer and bottom layer in the epicenters of main earthquakes with MS≥5.0

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  • 通讯作者:  冯丽丽, ynufll@sina.com
  • 收稿日期:  2018-04-27
  • 录用日期:  2018-10-31
  • 网络出版日期:  2019-03-01
通讯作者: 陈斌, bchen63@163.com
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