基于GIM的芦山地震电离层异常分析
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摘要
利用IGS(国际卫星定位导航服务组织)提供的GIM数据对2013-04-20发生的Mw7.0芦山地震震区上空电离层信息进行了研究。选取震中附近格网点进行包络线法异常分析及通过绘制全球电离层异常图来分析异常。通过分析发现,震前存在明显的电离层异常,在4月14日即震前第6天存在异常;异常区域沿着赤道共轭分布,不断移动。通过分析地磁指数、太阳活动水平等信息量,发现电离层异常与地震有较明显的关系。
IGS GIM data is used to analyze ionosphere information of Mw7.0 Lushan earthquake on April 20,2013. The grid points near the epicenter are selected to analyze by the envelope method and draw abnormal global ionospheric anomalies map. The analysis results show that there are obvious ionospheric anomalies on 14 th April which is six days before the earthquake. The abnormal conjugate area is distributed along the equator and constantly moving. By analyzing geomagnetic indices, solar activity level, etc, it shows that ionospheric anomalies and earthquakes have a significant relationship.
IGS GIM data is used to analyze ionosphere information of Mw7.0 Lushan earthquake on April 20,2013. The grid points near the epicenter are selected to analyze by the envelope method and draw abnormal global ionospheric anomalies map. The analysis results show that there are obvious ionospheric anomalies on 14 th April which is six days before the earthquake. The abnormal conjugate area is distributed along the equator and constantly moving. By analyzing geomagnetic indices, solar activity level, etc, it shows that ionospheric anomalies and earthquakes have a significant relationship.
引文
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[2]DAUTERMANN T,CALAIS E,HAASE J,et al.Investigation of Ionospheric Electron Content Variations Before Earthquakes in Southern California,2003—2004[J].Journal of Geophysical Research:Solid Earth(1978—2012),2007,112(B2).
[3]姚宜斌,陈鹏,吴寒,等.2011年3月11日日本地震震前电离层异常变化分析[J].科学通报,2012,57(5):355-365.
[4]PULINETS S A,BOYARCHUK K A,HEGAI V V,et al.Quasielectrostatic Model of Atmosphere-Thermosphere-Ionosphere Coupling[J].Advances in Space Research,2000,26(8):1209-1218.
[5]ZASLAVSKI Y,PARROT M,BLANCE E.Analysis of VTEC Measurements above Active Seismic Regions[J].Phys Earth Planet Int,1998,105:219-228.
[6]LIU J Y,CHEN Y I,PULINETS S A,et al.Seismo-Ionospheric Signatures Prior to M≥6.0 Taiwan Earthquakes[J].Geophysical Research Letters,2000,27(19):3113-3116.
[7]PULINETS S A,LEGEN’KA A D.Spatial-Temporal Characteristics of Large Scale Disturbances of Electron Density Observed in the Ionospheric F-region Before Strong Earthquakes[J].Cosmic Research,2003,41(3):221-230.
[8]吴云,乔学军,周义炎.利用地基GPS探测震前电离层TEC异常[J].大地测量与地球动力学,2005,25(2):36-40.
[9]LEONARD R S,BARNES R A.Observation of Ionospheric Disturbances Following the Alaska Earthquake[J].Journal of Geophysical Research,1965,70(5):1250-1253.
[10]李施佳,蔡昌盛,付凯斌.用GPS观测数据探测日本9.0级地震的电离层异常[J].大地测量与地球动力学,2012,32(3):37-40.
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