汶川M_S8.0地震前ELF异常电磁辐射传播分析
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摘要
对法国DEMETER卫星记录的2008年5月12日汶川MS8.0地震前10天连续轨道的电磁数据进行了时-频功率谱分析,发现在震前第6天存在低于截止频率的窄带电磁辐射.为进一步分析该电磁辐射的传播特性,采用奇异值分解方法在时-频域下分析了电磁辐射的极化特性、波矢量特性等电磁波传播特性,发现该电磁辐射呈现出很强的平面波特征,传播方向呈现上行传播.而在震前10天连续轨道数据的分析中,在非震区上空并未发现类似的异常现象.
Based on the electromagnetic data recorded by DEMETER satellite during the past ten days before 12 May 2008 Wenchuan MS8.0 earthquake,an anomaly below cut-off frequency is detected at the sixth day before the earthquake using power spectrum analysis. In order to learn the propogation characteristic of the abnormal electromagnetic emmision,singular value decomposition (SVD) method is used to get polarization and wave vector of the emmison signals. The result shows that the anomaly reveals plane wave features and it propagated upwards. No similar phenomena are found above other non-seismic regions.
Based on the electromagnetic data recorded by DEMETER satellite during the past ten days before 12 May 2008 Wenchuan MS8.0 earthquake,an anomaly below cut-off frequency is detected at the sixth day before the earthquake using power spectrum analysis. In order to learn the propogation characteristic of the abnormal electromagnetic emmision,singular value decomposition (SVD) method is used to get polarization and wave vector of the emmison signals. The result shows that the anomaly reveals plane wave features and it propagated upwards. No similar phenomena are found above other non-seismic regions.
引文
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Hayakawa M,Molchanov O A,Ondoh T,Kawai E.1996.The precursory signature effect of the Kobe earthquake onsubionospheric VLF signals[J].CommRes Lab,43(2):169-180.
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Hayakawa M,Nickolaenko A P,Sekiguchi M,Yamashita K,Ida Y,Yano M.2008.Anomalous ELF phenomenain theSchumann resonance band as observed at Moshiri(Japan)in possible association with an earthquake in Tai wan[J].Nat Hazards Earth Syst Sci,8(6):1309-1316.
Ondoh T.2004.Anomalous sporadic-Eionization before a great earthquake[J].Advances in Space Research,34(8):1830-1835.
Pulinets S A.1998.Strong earthquakes prediction possibility with the help of topside sounding fromsatellites[J].Ad-vances in Space Research,21(3):455-458.
Pulinets S A,Legen’ka A D,Gaivoronskaya T V,Depuev V K.2003.Main phenomenological features of ionosphericprecursors of strong earthquakes[J].At mos Solar-Terr Phys,65(16):1337-1347.
Pulinets S A.2004.Ionospheric precursors of earthquakes;Recent advancesintheory and practical applications[J].TerrAt mos Ocean Sci,15(3):413-435.
Santohk O,Parrot M,Lefeuvre F.2003.Singular value decomposition methods for wave propagation analysis[J].RadioSci,38(1):1010-1023.
张学民,刘静,钱家栋,申旭辉,蔡晋安,欧阳新艳,赵庶凡.2008.西藏改则6.9级地震前的电离层电磁扰动[J].地震,28(3):213-221.
Biagi P F,Piccolo R,Ermini A,Martellucci S,Bellecci C,Hayakawa M,Capozzi V,Kingsley S P.2001a.Possibleearthquake precursors revealed by LF radio signals[J].Nat Hazards Earth Syst Sci,2(1):99-104.
Biagi P F,Piccolo R,Ermini A,Martellucci S,Bellocci C,Hayakawa M,Kingsley S P.2001b.Disturbances in LFra-dio-signals as seismic precursors[J].Annali di Geofisica,44(5-6):1011-1019.
Chen YI,Chuo J Y,Liu J Y,Pulinets S A.1999.Statistical study of ionospheric precursors of strong earthquakes atTai wan area[C]∥XXVI URSI General Assembly.Toronto:URSI:745.
Hayakawa M,Molchanov O A,Ondoh T,Kawai E.1996.The precursory signature effect of the Kobe earthquake onsubionospheric VLF signals[J].CommRes Lab,43(2):169-180.
Hayakawa M,Ohta K,Nickolaenko AP,Ando Y.2005.Anomalous effect in Schumann resonance phenomena observedin Japan,possibly associated with the Chi-Chi earthquake in Tai wan[J].Ann Geophysicae,23(6):1335-1346.
Hayakawa M,Nickolaenko A P,Sekiguchi M,Yamashita K,Ida Y,Yano M.2008.Anomalous ELF phenomenain theSchumann resonance band as observed at Moshiri(Japan)in possible association with an earthquake in Tai wan[J].Nat Hazards Earth Syst Sci,8(6):1309-1316.
Ondoh T.2004.Anomalous sporadic-Eionization before a great earthquake[J].Advances in Space Research,34(8):1830-1835.
Pulinets S A.1998.Strong earthquakes prediction possibility with the help of topside sounding fromsatellites[J].Ad-vances in Space Research,21(3):455-458.
Pulinets S A,Legen’ka A D,Gaivoronskaya T V,Depuev V K.2003.Main phenomenological features of ionosphericprecursors of strong earthquakes[J].At mos Solar-Terr Phys,65(16):1337-1347.
Pulinets S A.2004.Ionospheric precursors of earthquakes;Recent advancesintheory and practical applications[J].TerrAt mos Ocean Sci,15(3):413-435.
Santohk O,Parrot M,Lefeuvre F.2003.Singular value decomposition methods for wave propagation analysis[J].RadioSci,38(1):1010-1023.
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