利用COSMIC掩星数据研究震前电离层异常
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摘要
利用COSMIC掩星星座的电离层掩星数据,对2009年9月30日印尼苏门答腊南部地区发生的7.7级地震引起的电离层响应作了详细的研究。根据地震前震中区域上空附近电离层电子密度峰值的异常变化,采用人工神经网络插值技术进行可视化分析处理,通过地震前6~20 d电离层F2层电子密度峰值的对比发现,震前5 d内震中区域上空的电离层F2层电子密度峰值出现明显的负异常现象,可排除太阳活动和地磁活动等影响的干扰,这种电离层异常现象的发生,极有可能是由即将发生的地震所引起的。
Ionospheric occultation data of the COSMIC constellation is used for a detailed study on the ionospheric respond caused by 7.7 magnitude earthquake occurred in southern Sumatra on September 30,2009.The paper uses interpolation techniques of artificial neural network,and discusses the abnormal changes of the electron density over the region around the epicenter,then makes visual analysis on it.By comparing the 6～20 days to the 5 days before the earthquake,ionospheric F2-layer peak electron density was found apparents negative anomaly phenomenon over the region around the epicenter in 5 days before the earthquake.The occurrence of this anomaly,following the removal of the impact of solar activity and geomagnetic activity disturbance,is most likely from the imminent earthquake.
Ionospheric occultation data of the COSMIC constellation is used for a detailed study on the ionospheric respond caused by 7.7 magnitude earthquake occurred in southern Sumatra on September 30,2009.The paper uses interpolation techniques of artificial neural network,and discusses the abnormal changes of the electron density over the region around the epicenter,then makes visual analysis on it.By comparing the 6～20 days to the 5 days before the earthquake,ionospheric F2-layer peak electron density was found apparents negative anomaly phenomenon over the region around the epicenter in 5 days before the earthquake.The occurrence of this anomaly,following the removal of the impact of solar activity and geomagnetic activity disturbance,is most likely from the imminent earthquake.
引文
[1]LEONARD R S,BARNES R A.Observation of ionosphericdisturbances following the Alaska earthquake[J].Journal ofGeophysical Research,1965,70(5):1250-1253.
[2]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,2000,19:3113-3116.
[3]LIU J Y,CHEN Y I,PULINETS S A,et al.A study on theTEC perturbations prior to the Rei-Li,Chi-Chi and Chia-Yiearthquakes[J].Seismo Electromagnetics,2004,4:297-301.
[4]LIU J Y,CHUO Y J,SHAN S J,et al.Pre-earthquakeionospheric anomalies registered by continuous GPS TECmeasurements[J].Annales Geophysicae,2004,22:1585-1590.
[5]LIU J Y,CHEN C H,CHEN Y I,et al.Seismo-geomagneticanomalies and M≥5.0 earthquakes observed in Taiwan during1988-2001[J].Physics and Chemistry of the Earth,2006,31:215-222.
[6]吴云,周义炎,林剑,等.GPS应用的新拓展[J].国际地震动态,2007,7:16-25.
[7]周义炎,吴云,乔学军,等.GPS掩星技术和电离层反演[J],大地测量与地球动力学,2005,25(2):29-35.
[8]杨剑,吴云,周义炎.利用GPS无线电掩星数据研究震前电离层异常[J].大地测量与地球动力学,2008,28(1):16-22.
[9]张代远.神经网络新理论与方法[M].北京:清华大学出版社,2006.
[10]徐丽娜.神经网络控制[M].北京:电力工业出版社,2009.
[2]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,2000,19:3113-3116.
[3]LIU J Y,CHEN Y I,PULINETS S A,et al.A study on theTEC perturbations prior to the Rei-Li,Chi-Chi and Chia-Yiearthquakes[J].Seismo Electromagnetics,2004,4:297-301.
[4]LIU J Y,CHUO Y J,SHAN S J,et al.Pre-earthquakeionospheric anomalies registered by continuous GPS TECmeasurements[J].Annales Geophysicae,2004,22:1585-1590.
[5]LIU J Y,CHEN C H,CHEN Y I,et al.Seismo-geomagneticanomalies and M≥5.0 earthquakes observed in Taiwan during1988-2001[J].Physics and Chemistry of the Earth,2006,31:215-222.
[6]吴云,周义炎,林剑,等.GPS应用的新拓展[J].国际地震动态,2007,7:16-25.
[7]周义炎,吴云,乔学军,等.GPS掩星技术和电离层反演[J],大地测量与地球动力学,2005,25(2):29-35.
[8]杨剑,吴云,周义炎.利用GPS无线电掩星数据研究震前电离层异常[J].大地测量与地球动力学,2008,28(1):16-22.
[9]张代远.神经网络新理论与方法[M].北京:清华大学出版社,2006.
[10]徐丽娜.神经网络控制[M].北京:电力工业出版社,2009.
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