新疆精河6.6级地震前精河水平摆异常特征分析
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摘要
以精河水平摆观测数据为研究对象,通过定量剔除温度对观测数据的影响,提取观测数据的异常特征。然后结合2017-08-09新疆精河6.6级地震的发震构造、震源机制、台站位置等,对精河水平摆的震前异常进行深入探讨。NS分量自2016-06起持续N倾,EW分量自2016-09起快速E倾,2016-12-17其E倾速率再次加快,幅度达0.48″的两项异常为精河6.6级地震前应力积累所致。
Taking Jinghe horizontal pendulum observation data as the research object, we eliminate the influence of temperature on observation data to extract the abnormal characteristics of observed data. Then, combining this with the seismogenic structure of the earthquake, focal mechanism, station location and seismogenic tectonic relationship, etc., before the earthquake anomaly of Jinghe horizontal pendulum, we infer:(1) the NS component continues to be inclined since June 2016;(2) the EW component has been rapidly leaning since September 2016, and on 17 December the rate of leaning accelerates again by 0.48, which is caused by the stress accumulation before the magnitude 6.6 earthquake.
Taking Jinghe horizontal pendulum observation data as the research object, we eliminate the influence of temperature on observation data to extract the abnormal characteristics of observed data. Then, combining this with the seismogenic structure of the earthquake, focal mechanism, station location and seismogenic tectonic relationship, etc., before the earthquake anomaly of Jinghe horizontal pendulum, we infer:(1) the NS component continues to be inclined since June 2016;(2) the EW component has been rapidly leaning since September 2016, and on 17 December the rate of leaning accelerates again by 0.48, which is caused by the stress accumulation before the magnitude 6.6 earthquake.
引文
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[2] 焦明若,张国民.地震前兆复杂性成因机理研究的讨论(二)——地震前兆复杂性成因机理[J].地震,1998,18(2):112-118(Jiao Mingruo,Zhang Guomin.Study on Genetic Mechanism of Seismic Precursory Complexity(Ⅱ)-Genetic Mechanism of Complexity of Seismic Precursors[J].Earthquake,1998,18(2):112-118)
[3] 中国地震局监测预报司.地形变测量[M].北京:地震出版社,2008(Monitoring and Forecasting Division of CEA.Topography Change Measurements[M].Beijing:Seismogical Press,2008)
[4] Zhao L S,Helmberger D V.Source Estimation from Broadband Regional Seismograms[J].Bull Seism Soc Am,1994,84(1):91-104
[5] Zhu L P,Helmberger D V.Advancement in Source Estimation Techniques Using Broadband Regional Seismograms[J].Bull Seism Soc Am,1996,86(5):1 634-1 641
[6] 邢喜民,孙吉泽,张治广.榆树沟定点形变受气象因素影响分析及典型震例[J].大地测量与地球动力学,2015,35(1):162-166(Xing Ximin,Sun Jize,Zhang Zhiguang.The Study on Yushugou Fixed Deformation Affected by Meteorological Factors and Typlcal Earthquake Examples[J].Journal of Geodesy and Geodynamics,2015,35(1):162-166)
[7] 邢喜民,孙吉泽,高丽娟.地温、气温、气压对精河台水平摆观测值的影响分析[J].中国地震,2015,31(2):415-423(Xing Ximin,Sun Jize,Gao Lijuan.Analysis on the Influence of Earth Temperature,Atmospheric Temperature,Pressure on the Jinghe Station Horizontal Pendulum Data[J].Earthquak Research in China,2015,31(2):415-423)