滇东北地区地震弱活动前兆异常特征研究
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摘要
以鲁甸M_S6.5地震震中附近的鲁甸大坪子泉水氡、水质观测资料为基础,通过对其地震前后的异常特征进行差异性对比,分析认为震前地震活动丛集,水氡、水质异常持续时间较长,幅度较大,表现为破年变异常现象;震后为小震群弱活动,水氡、水质异常幅度相对较小,持续时间较短,多次出现同步转折,表现为介质弱化区的前兆异常特征。从水样测试结果, GNSS位移观测资料、 GPS时间序列曲线及地震活动性等方面分析了鲁甸水氡、水质的异常机理,认为鲁甸的水质离子组分群体异常,与区域的变形活动有关,局部应力的不断积累,加剧了地下深部物质活动及构造活动;近期的同步转折现象属于介质弱化区应力调整状态下的前兆异常。
The paper selected the observation data of Radon and Water quality ion in Dapingzi spring, which located near the epicenter of Ludian M_S6.5 earthquake, and compared the anomalous characteristic before and after the earthquake. The results show that moderate-strong seismic activity is clustered before the earthquake. Radon and water quality anomaly lasted for a long time and had a large amplitude. It presents a phenomenon of breaking annual variation. While after the earthquake, weak activity of small earthquake swarmed, the abnormal amplitude is relatively small, and the duration is shorter, and there are many simultaneous twists and turns, which is the precursor anomaly of the medium weakening region. Based on the results of water sample test, GNSS displacement observation data, GPS time series curve and earthquake activity, this paper analyzed the precursor mechanism of the Radon and Water quality ion. We think that the group anomalies are related to the regional deformation activities. Local stress is continuously accumulated in Northeastern Yunnan, so that deep underground material activities and tectonic activities continue to be intensified. The recent synchronic transition phenomenon belongs to the precursor anomaly in the stress adjustment of the medium weakening area.
The paper selected the observation data of Radon and Water quality ion in Dapingzi spring, which located near the epicenter of Ludian M_S6.5 earthquake, and compared the anomalous characteristic before and after the earthquake. The results show that moderate-strong seismic activity is clustered before the earthquake. Radon and water quality anomaly lasted for a long time and had a large amplitude. It presents a phenomenon of breaking annual variation. While after the earthquake, weak activity of small earthquake swarmed, the abnormal amplitude is relatively small, and the duration is shorter, and there are many simultaneous twists and turns, which is the precursor anomaly of the medium weakening region. Based on the results of water sample test, GNSS displacement observation data, GPS time series curve and earthquake activity, this paper analyzed the precursor mechanism of the Radon and Water quality ion. We think that the group anomalies are related to the regional deformation activities. Local stress is continuously accumulated in Northeastern Yunnan, so that deep underground material activities and tectonic activities continue to be intensified. The recent synchronic transition phenomenon belongs to the precursor anomaly in the stress adjustment of the medium weakening area.
引文
[1] 徐锡伟,江国焰,于贵华,等.鲁甸6.5级地震发震断层判定及其构造属性讨论[J].地球物理学报,2014,57(9):3060-3068.
[2] 王兴臣,丁志峰,武岩,等.鲁甸MS6.5地震震源区地壳结构及孕震环境研究[J].地球物理学报,2015,58(11):4031-4040.
[3] 张广伟,雷建设,梁姗姗,等.2014年8月3日云南鲁甸MS6.5级地震序列重定位与震源机制研究[J].地球物理学报,2014,57(9):3018-3027.
[4] 张勇,许力生,陈运泰,等.2014年8月3日云南鲁甸MW6.1 (MS6.5)地震破裂过程[J].地球物理学报,2014(9):3052-3059.
[5] Liu C L,Zheng Y,Xiong X,et al.Rupture process of MS6.5 Ludian earthquake constrained by regional broadband seismograms[J].Chinese Journal of Geophysics,2014,57(9):3028-3037.
[6] Fang L H,Wu J P,Wang W L,et al.Relocation of the aftershock sequence of the MS6.5 Ludian earthquake and its seismogenic structure[J].Seismology & Geology,2014,36(4):1173-1185.
[7] 刘耀炜,任宏微,张磊,等.鲁甸6.5级地震地下流体典型异常与前兆机理分析[J].地震地质,2015,37(1):307-318.
[8] 付虹,钱晓东,毛玉平,等.2014年云南鲁甸MS6.5地震异常及预测[J].地震研究,2015,38(2):181-188.
[9] 李琼,付虹,朱荣欢,等.滇东北MS≥5.0地震前地下流体异常特征与2014年云南鲁甸6.5级地震研究[J].地震研究,2014,37(4):495-502.
[10] Kikuchi M.Dispersion and attenuation of elastic waves due to multiple scattering from inclusions [J].Physics of the Earth & Planetary Interiors,1981,25(2):159-162.
[11] 单修政.地震与地下水关系研究概况及几个问题的探讨[J].国际地震动态,1986,(5):16-19.
[12] 云南省地震局水文地质工程地质队.区域水文地质普查报告(昭通幅)[M].1979:79-92.
[13] 皇甫岗,陈勤,王彬,等.2014年云南鲁甸6.5级地震[M].昆明:云南科技出版社.2015,35-47.
[14] 李学礼,孙占学,刘金辉.水文地球化学[M].北京:原子能出版社,2010,237-256.
①云南省地震局.2014.云南省2014年年中地震趋势报告.
(1)地震数据来源于国家地震科学数据共享中心(CEDC)
[2] 王兴臣,丁志峰,武岩,等.鲁甸MS6.5地震震源区地壳结构及孕震环境研究[J].地球物理学报,2015,58(11):4031-4040.
[3] 张广伟,雷建设,梁姗姗,等.2014年8月3日云南鲁甸MS6.5级地震序列重定位与震源机制研究[J].地球物理学报,2014,57(9):3018-3027.
[4] 张勇,许力生,陈运泰,等.2014年8月3日云南鲁甸MW6.1 (MS6.5)地震破裂过程[J].地球物理学报,2014(9):3052-3059.
[5] Liu C L,Zheng Y,Xiong X,et al.Rupture process of MS6.5 Ludian earthquake constrained by regional broadband seismograms[J].Chinese Journal of Geophysics,2014,57(9):3028-3037.
[6] Fang L H,Wu J P,Wang W L,et al.Relocation of the aftershock sequence of the MS6.5 Ludian earthquake and its seismogenic structure[J].Seismology & Geology,2014,36(4):1173-1185.
[7] 刘耀炜,任宏微,张磊,等.鲁甸6.5级地震地下流体典型异常与前兆机理分析[J].地震地质,2015,37(1):307-318.
[8] 付虹,钱晓东,毛玉平,等.2014年云南鲁甸MS6.5地震异常及预测[J].地震研究,2015,38(2):181-188.
[9] 李琼,付虹,朱荣欢,等.滇东北MS≥5.0地震前地下流体异常特征与2014年云南鲁甸6.5级地震研究[J].地震研究,2014,37(4):495-502.
[10] Kikuchi M.Dispersion and attenuation of elastic waves due to multiple scattering from inclusions [J].Physics of the Earth & Planetary Interiors,1981,25(2):159-162.
[11] 单修政.地震与地下水关系研究概况及几个问题的探讨[J].国际地震动态,1986,(5):16-19.
[12] 云南省地震局水文地质工程地质队.区域水文地质普查报告(昭通幅)[M].1979:79-92.
[13] 皇甫岗,陈勤,王彬,等.2014年云南鲁甸6.5级地震[M].昆明:云南科技出版社.2015,35-47.
[14] 李学礼,孙占学,刘金辉.水文地球化学[M].北京:原子能出版社,2010,237-256.
①云南省地震局.2014.云南省2014年年中地震趋势报告.
(1)地震数据来源于国家地震科学数据共享中心(CEDC)