DEMETER卫星观测到的智利7.9级地震前的电离层电磁扰动
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摘要
利用法国DEMETER卫星观测的电离层电磁数据,分析了2007年11月14日智利7.9级地震前10天内的电磁信号记录,结果发现在震前1周内,低频电磁扰动开始在比较宽的纬度范围内增强,震前3天异常信号幅度达到最大,并在低纬度地区尤其突出.以5天为间隔,比较分析了多参量的空间图像,发现在震前5天异常幅度和范围扩大,震中位于异常区域的边缘地带.分析认为,这次地震前的异常信号与孕震区电磁辐射信号增多及空间加热扰动有关.
Based on the ionospheric electromagnetic data observed on satellite DEMETER of France,the ionospheric electromagnetic signals were analyzed in 10 days before the Chili 7.9 earthquake on Nov.14,2007.It is found that, before 1 week of this earthquake,low frequency electromagnetic disturbances began to increase on a large scale of latitude,and in three days before it,the anomalous signals reached a maximum,especially outstanding at low latitude areas.Divided in 5 days,spatial images of a few parameters were exhibited.During 5 days prior to this earthquake, the amplitude and scale of anomalies enlarged,while the epicenter is located at the boundary of the anomalous region. It is thought that these spatial anomalies may be correlated to increasing electromagnetic emissions and heating process in the earthquake preparation area.
Based on the ionospheric electromagnetic data observed on satellite DEMETER of France,the ionospheric electromagnetic signals were analyzed in 10 days before the Chili 7.9 earthquake on Nov.14,2007.It is found that, before 1 week of this earthquake,low frequency electromagnetic disturbances began to increase on a large scale of latitude,and in three days before it,the anomalous signals reached a maximum,especially outstanding at low latitude areas.Divided in 5 days,spatial images of a few parameters were exhibited.During 5 days prior to this earthquake, the amplitude and scale of anomalies enlarged,while the epicenter is located at the boundary of the anomalous region. It is thought that these spatial anomalies may be correlated to increasing electromagnetic emissions and heating process in the earthquake preparation area.
引文
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[2] Chmyrec V M,Isaev N V,Bilichenko S V,et al.Observation by space-borne detectors of electric fields and hydromagnetic waves in the ionosphere over an earthquake canter[J].Physics of the Earth and Planetary Interiors,1989,57:110～114．
[3] Parrot M,mogilevsky M M.VLF emissions associated with earthquakes and observed in the ionosphere and the magnetosphere[J].Physics of the Earth and Planetary Interiors,1989,57:86～99．
[4] Pulinets S A,Legen'ka A D.Spatial-temporal characteristics of the large scale disturbances of the electron concentration observed in the F region of the ionosphere before strong earthquake[J].Cosm.Res.,2003,41:221～229．
[5] Molchanov O A,Mazhaeva O A,Golyavin A N,and Hayakawa M.Observation by the INTERCOSMOS-24 satellite of ELF-VLF electromagnetic emissions associated with earthquake[J].Ann.Geophys.,1993,11:431 ～ 440．
[6] 蔡军涛,赵国泽,詹艳,等.地震期间电离层扰动现象研究[J].地球物理学进展,2007,22(3) :695～701． Cai J T,Zhao G Z,Zhan Y,et al.The study on ionospheric disturbances during earthquakes[J].Progress in Geophysics,2007,22(3) :695～701．
[7] 曾中超,张蓓,方广有,等.利用DEMETER卫星数据分析汶川地震前的电离层异常[J].地球物理学报,2009,52(1) :11～19． Zeng Z C,Zhang B,Fang G Y,et al.The analysis of ionospheric variations before Wenchuan earthquake with DEMETER data[J].Chinese J.Geophys.,2009,52(1) :11～19．
[8] Parrot M,Berthelier J J,Lebreton J P,et al.Examples of unusual ionospheric observations made by the DEMETER satellite over seismic regions[J].Physics and Chemistry of the Earth,2006,31:486～495．
[9] Berthelier J J,Godefroy M,Leblanc F,el al.ICE,the electric field experiment on DEMETER[J].Planetary and Space Science,2006,54:456～471．
[10] Berthelier J J,Godefroy M,Leblanc F,et al.IAP,the thermal plasma analyzer on DEMETER[J].Planetary and Space Science,2006,54:487～501．
[11] Lebreton J P,Stverak S,Travnicek P,et al.The ISL langmuir Probe ecperiment and its data procession onboard DEMETER:scientific objectives,description and first results[J].Planetary and Space Science,2006,54:472～486．
[12] Parrot M,Benoist D,Berthelier J J,et al.The magnetic field experiment IMSC and its data processing onboard DEMETER:scientific objectives,description and first results[J].Planetary and Space Science,2006,54:441～ 455．
[13] Sauvaud J A,Moreau T,maggiolo R,et al.High energy electron detection onboard DEMETER:the IDP spectrometer,description and first results on the inner belt[J].Planetary and Space Science,2006,54:502～511．
[14] 熊浩.电磁波传播与空间环境[M].北京:电子工业出版社,2004,44～45． Xiong H.Electromagnetic wave dissemination and spatial environment[M].Beijing:Electronics Industry Publishing House,2004,44～45．
[15] Molchanov O A,Hayakawa V V,Afonin O A,et al.Possibal influence of seismicity by gravity waves on ionospheric equatrial anomaly from data of Ik-24 satellite 2． Equatorial anomaly and small-scale ionospheric turbulence,in“ Seismo Elctrromagnetics(Lithosphere-Atmosphere-Ionsphere Coupling)”[M].ed.By Hayakawa M and Malchanov O A,TERRAPUB,Tokyo,2002,287～296．
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