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ISSN?0253-3782 CN?11-2021/P

2017年8月9日精河MS6.6地震余震序列精定位及发震构造分析

翟亮 ,? 张晓东 ,? 王伟君

引用本文: 翟亮,?张晓东,?王伟君. 2019.?2017年8月9日精河MS6.6地震余震序列精定位及发震构造分析.?地震学报,?41(3):?314-328. doi: 10.11939/jass.20180124 shu
Citation:? Zhai Liang,?Zhang Xiaodong,?Wang Weijun. 2019.?Precise location and seismogenic structure analysis of aftershock sequence of Jinghe MS6.6 earthquake on August 9,2017.?Acta Seismologica Sinica,?41(3):?314-328. doi: 10.11939/jass.20180124 shu

2017年8月9日精河MS6.6地震余震序列精定位及发震构造分析

    通讯作者: 张晓东, zxd@cea-ies.ac.cn
摘要: 为确定2017年8月9日精河MS6.6地震的发震构造,本文使用双差定位方法对发震时刻至2017年10月震源区所发生的余震进行了精定位,同时利用CAP波形反演方法,得到了主震的震源机制解,同时使用GPAT方法反演得到了部分余震的震源机制解,并基于两者对本次地震的发震构造予以分析。结果显示:精定位后主震位于(44.27°N,82.85°E),震源深度为17 km;主震最佳双力偶解对应的节面Ⅰ的走向为260°、倾角为51°、滑动角为84°,节面Ⅱ的走向为89.5°、倾角为39.4°、滑动角为97.4°;余震序列位于主震东侧,并向东展布约30 km,在3—18 km深度范围内均有分布,其优势方向为近EW向,次优势方向为SW向。结果表明,本次地震是一次逆冲型地震,通过反演得到的大量小震震源机制解的结果与主震震源机制解结果相一致。结合余震震中分布、主震及余震的震源机制解以及震源区的地质构造,本文推断近EW走向具有逆冲性质的库松木楔克山前断裂为精河主震的发震构造。

English

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  • 图?1? 精河地震震源区及邻区构造背景

    Figure?1.? Tectonic settings of the source region of Jinghe earthquake and its neighbouring areas

    图?2? 精河MS6.6地震震中及台站分布

    Figure?2.? Epicenter location of Jinghe MS6.6 earthquake and stations distribution

    图?3? 重定位前(a)、后(b)的走时均方根误差

    Figure?3.? RMS error of travel time before (a) and after (b) relocation

    图?4? 精河MS6.6地震序列重定位前的震中分布

    Figure?4.? Epicentral distribution of Jinghe MS6.6 earthquake sequence before relocation

    图?5? 精定位后事件分布的剖面图

    Figure?5.? Cross sections of the relocated earthquakes

    图?6? 2017年8月9号精河主震的CAP反演震源机制解结果

    Figure?6.? Focal mechanism solution results of Jinghe earthquake on August 9,2017 by the CAP method

    图?7? 精河地震的拟合差和震源机制解(下半球投影)随矩心深度的变化

    Figure?7.? Misfit plots as a function of centroid depth for Jinghe earthquake (lower-hemisphere projection)

    图?8? 精河地震序列中ML>3.0事件的震源机制解

    Figure?8.? Focal mechanism solutions for the ML>3.0 events of Jinghe earthquake sequence

    图?9? 精河地震序列的节面走向(a)、倾角(b)、滑动角(c)玫瑰花图

    Figure?9.? Rose maps of the strike (a),dip (b) and rake (c) of nodal planes for the Jinghe earthquake sequence

    图?10? 精河地震序列P轴(左)和T轴(右)的方位角(a)和倾角(b)的玫瑰花图

    Figure?10.? Rose maps of the azimuth (a) and plunge (b) of P-axis (left panels) and T-axis (right panels) for the Jinghe earthquake sequence

    地层深度/kmvP/(km·s?1vS/(km·s?1
    0—44.002.31
    4—165.813.36
    16—256.103.53
    25—346.653.84
    34—456.833.95
    >458.094.68

    表?1? 速度结构(邵学钟等,1996

    Table?1.? Velocity structure (after Shao et al,1996

    下载: 导出CSV
    来源MW矩心深度/km走向/°倾角/°滑动角/°
    USGS (2017)6.3202693087
    GCMT (2017)6.327.82445266
    中国地震局地球物理研究所 (2017)6.25202624580
    中国地震台网中心 (2017)6.3232694799
    本文6.15172605184

    表?2? 2017年8月9日精河MS6.6主震震源机制解结果对比

    Table?2.? Comparison of focal mechanism solutions of Jinghe MS6.6 main shock on August 9,2017

    下载: 导出CSV
    反演方法节面Ⅰ节面Ⅱ短心深度/km
    走向/°倾角/°滑动角/°走向/°倾角/°滑动角/°
    GPAT28141731235110414
    CAP2794483108.74696.718

    表?3? 使用GPAT和CAP方法所得2017年9月9日ML4.3地震反演结果的对比

    Table?3.? Comparison of inversion results for the ML4.3 earthquake on September 9,2017 by using GPAT and CAP methods

    下载: 导出CSV
    事件震中位置深度
    /km
    ML节面ⅠPT
    东经/°北纬/°走向/°倾角/°滑动角/°方位角/°倾角/°方位角/°倾角/°
    182.6144.2913.04.1270.344.193.1178.10.9?68.387.6
    282.7444.318.03.5258.337.088.7169.28.0?5.182.0
    382.7844.217.03.1332.053.0157.3210.018.0310.040.0
    482.6544.268.03.1230.289.013.04.38.495.89.9
    582.7444.325.03.0240.081.090.2?30.236.0150.254.0
    682.8544.306.03.8234.080.0?18.0?170.419.8?78.55.3
    782.6544.2511.03.0321.032.090.0?129.013.051.077.0
    882.7644.2511.02.5223.058.39.4179.515.980.828.0
    982.7444.2511.03.8285.615.0?37.3?52.152.6152.334.9
    1082.6844.248.03.1251.456.171.7?5.69.4115.172.1
    1182.6444.2612.02.7221.043.0131.0103.08.8?150.261.8
    1282.7344.287.02.5286.79.1173.6121.843.3?76.145.3
    1382.7144.2412.02.2211.062.0?9.0171.725.475.113.6
    1482.7544.2912.02.5280.638.03.2?112.932.2130.435.6
    1582.7144.2915.03.9227.564.3109.8?57.017.0172.065.0
    1682.6744.287.01.8284.320.270.5?150.525.746.163.4
    1782.6944.276.01.7315.645.5?103.1143.380.7?125.20.3
    1882.8944.108.01.8210.539.3?76.3?122.979.2110.86.4
    1982.5744.266.02.1294.650.9144.2169.37.2?92.150.1
    2082.7544.2912.03.1270.240.564.8?162.17.085.072.4
    2182.8744.298.03.6270.957.1?138.2123.551.232.70.7
    2282.7144.2413.01.6305.626.8157.4166.330.6?61.148.9
    2382.7344.2811.01.5232.479.1?172.996.412.7?173.02.7
    2482.7544.2710.01.6218.186.164.3?29.636.0103.343.1
    2582.6944.3111.01.5257.559.163.26.410.3119.164.8
    2682.7044.298.02.1290.178.4145.2?16.814.7?116.432.5
    2782.7244.2813.02.9279.841.9118.3170.16.3?81.770.4
    2882.6044.2911.02.3233.073.438.9?2.612.998.038.9
    2982.4044.109.03.0259.649.647.6?161.93.5102.458.9
    3082.7744.297.03.2272.049.8?139.2116.354.0?145.45.9
    3182.7744.296.03.6282.840.395.9169.327.8?48.356.4
    3282.7744.2911.04.0183.068.093.0?89.322.998.466.9
    3382.7744.297.03.1286.853.9?120.7137.465.238.04.3
    3482.7844.198.02.6235.682.419.28.07.9100.718.9
    3582.7244.2918.03.7277.144.4122.9164.45.2?93.367.0
    3682.9644.3414.01.8268.340.040.0122.2155.99.0?91.0
    3782.7044.306.02.0279.849.2108.3?3.02.6?103.776.0
    3882.5944.256.03.0263.332.772.4?174.013.442.473.6
    3982.3444.2611.01.8244.461.343.35.54.9?101.449.9
    4082.7144.3211.02.0227.415.037.3?179.334.925.152.6
    4182.4144.149.02.1231.085.097.0?45.539.6148.649.5
    4282.6744.2517.04.3277.224.929.6?127.829.695.452.0
    4382.7144.2917.01.4246.426.765.0175.020.125.966.9
    4482.6644.2612.02.4261.055.065.18.56.9116.468.6
    4582.7044.325.01.6261.951.0?164.5114.236.3?142.617.3
    4682.6844.2311.02.0260.348.257.5?167.41.599.166.3
    4782.4743.586.01.8184.640.0176.939.131.1153.634.5
    4882.6544.278.01.9253.750.057.0?173.6096.365.3
    4982.9444.3311.02.0276.274.8120.8?17.123.6?139.150.5
    5083.3244.288.02.1286.437.2?163.3127.843.3?114.626.1
    5183.3544.2817.03.8290.032.779.0?152.012.754.775.9
    5283.1344.345.02.1237.480.350.0?2.724.2110.540.9
    5382.9944.316.01.7278.445.5103.1179.20.3?89.380.7
    5482.7344.2910.02.4281.952.769.226.55.6134.772.6
    5582.4944.2611.02.3309.545.2117.6?159.73.1?60.970.5
    5682.7544.2816.02.0334.439.6126.1?140.710.4?27.065.4
    5782.8343.499.03.7272.846.187.14.91.1121.887.7
      注:表中黑体数字为精河地震序列中部分 ML>3.0余震及其震源机制解。

    表?4? 2017年8月9日精河地震余震的震源机制解

    Table?4.? Focal mechanism solutions for the aftershocks of Jinghe earthquake on August 9,2017

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  • 通讯作者:? 张晓东, zxd@cea-ies.ac.cn
  • 收稿日期:? 2018-10-17
  • 录用日期:? 2019-02-25
  • 网络出版日期:? 2019-05-01
通讯作者: 陈斌, bchen63@163.com
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