DEMETER卫星磁场波形数据分析方法初探
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摘要
为充分利用法国DEMETER地震电磁卫星中心提供的磁场波形数据对地震事件进行分析研究,详细介绍了峰度演化方法,并对峰度演化方法的有效性进行了检验,最后将峰度演化方法应用于汶川地震前后DEMETER卫星所记录到的实际数据。分析研究发现,所采用的方法能够较好的处理DEMETER卫星记录到的磁场波形数据;汶川地震发生之前较长时间段内,磁场数据的峰度随时间的变化较为平缓,从地震发生前10天开始,其峰度演化在距离震中最近位置时刻附近出现尖峰现象,预示着有外部场源的信号的介入,这种现象在地震发生以后较长时间段内一直存在,这与此次地震的临震和余震对应较好,在对磁场的影响进行排除后,更进一步增强了尖峰现象和地震之间的联系。
To make full use of the magnetic-field waveform data provided by the French DEMETER(detection of electro-magnetic emissions transmitted from earthquake regions) satellite centers analyzing the seismic events,the paper introduced in detail the kurtosis evolution method,and tested the validity of the method.Then,the paper applied the method in the actual data recorded by the DEMETER satellite before and after the Wenchuan earthquake.The results show that the method can be better deal with the magnetic field waveform data recorded by DEMETER satellite;during a longer period before the earthquake occurrence,the change with time of the kurtosis of magnetic field data is relatively smooth;about 10 days before the earthquake(May 2),there is a peak appearing in the moment when the distance between orbit and the epicenter is shortest,which indicates that there are signals of external field source involved.These phenomena persist a long time after the earthquake,for the time of peaks appearing,it is corresponding better to the Wenchuan earthquake.The analysis result of the Kp index indicates the relationship between peak phenomenon and earthquakes.
To make full use of the magnetic-field waveform data provided by the French DEMETER(detection of electro-magnetic emissions transmitted from earthquake regions) satellite centers analyzing the seismic events,the paper introduced in detail the kurtosis evolution method,and tested the validity of the method.Then,the paper applied the method in the actual data recorded by the DEMETER satellite before and after the Wenchuan earthquake.The results show that the method can be better deal with the magnetic field waveform data recorded by DEMETER satellite;during a longer period before the earthquake occurrence,the change with time of the kurtosis of magnetic field data is relatively smooth;about 10 days before the earthquake(May 2),there is a peak appearing in the moment when the distance between orbit and the epicenter is shortest,which indicates that there are signals of external field source involved.These phenomena persist a long time after the earthquake,for the time of peaks appearing,it is corresponding better to the Wenchuan earthquake.The analysis result of the Kp index indicates the relationship between peak phenomenon and earthquakes.
引文
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[13]Berthelier J J,Godefroy M,Leblanc F,et al.The thermal plasma analyzer on DEMETER[J].Planetery andSpace Science,2006,54:487-501.
[14]Lebreton J P,Stverak S,Travnicek P,et al.The ISL langmuir Probe ecperiment and its data processiononboard DEMETER:Scientific objectives,description and first results[J].Planetery and Space Science,2006,54:472-486.
[15]Parrot M,Benoist D,Berthelier J J,et al.The magnetic field experiment IMSC and its data processingonboard DEMETER:scientific objectives,description and first results[J].Planetary and Space Science,2006,54:441-455.
[16]Sauvaud J A,Moreau T,Maggiolo R,et al.High energy electron detection onboard DEMETER:The IDPspectrometer,description and first results on the inner belt[J].Planetery and Space science,2006,54:502-511.
[17]朱荣,杨冬梅,荆凤,等.DEMETER卫星观测到的云南普洱地震前的电离层扰动[J].地震学报,2008,30(1):76-81.
[18]欧阳新艳,张学民,申旭辉,等.普洱地震前电离层电子密度扰动变化研究[J].地震学报,2008,30(4):424-436.
[19]Lagoutte D,Brochot J Y,Latremoliere P.Analysis tools[M].May 2000,LPCE/NI/003.E-PART.
[2]Parrot M,Achache J,Berthelier J J,et al.High-frequency seismo-electromagnetic effects[J].Phys.EarthPlanet.Int.,1993,77(1-2):65-83.
[3]Pulinets S A,Boyarchuk K A.Ionospheric precursors of earthquakes[M].New York:Springer,2004.
[4]余涛,毛田,王云冈,等.汶川特大地震前电离层主要参量变化[J].科学通报,2009,54(4):493-499.
[5]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.
[6]何宇飞,杨冬梅,陈化然,等.DEMETER卫星探测到可能与汶川地震有关的地面VLF发射站信号的信噪比变化[J].中国科学D辑:地球科学,2009,39(4):403-412.
[7]张学民,刘静,钱家栋,等.西藏改则6.9级地震前的电离层电磁扰动扰动[J].地震,2008,28(3):14-22.
[8]朱荣,杨冬梅,腾云田,等.从卫星观测数据提取地震前兆信息研究中的参考文献[J].国际地震动态,2007,340(4):36-42.
[9]Matthews J P,Lebreton J P.A search for seismic related wave activity in the micropulsation and U LFfrequency ranges using GEOS-2 data[J].Annales Geophysicae,1985,3:749.
[10]Parrot M,Lefeuvre F.Correlation between GOES VLF emissions and earthquakes[J].1985,3:737-748.
[11]Henderson T R,Sonwalkar V S,Helliwell R A,et al.A search for ELF/VLF emissions induced byearthquakes as observed in the ionosphere by the DE一2 Satellite[J].Journal of Geophysical Research,1993,98:9503-9514.
[12]Berthelier J J,Godefroy M,Leblanc F,et al.The electric field experiment on DEMETER[J].Planetery andSpace Science,2006,54:456-471.
[13]Berthelier J J,Godefroy M,Leblanc F,et al.The thermal plasma analyzer on DEMETER[J].Planetery andSpace Science,2006,54:487-501.
[14]Lebreton J P,Stverak S,Travnicek P,et al.The ISL langmuir Probe ecperiment and its data processiononboard DEMETER:Scientific objectives,description and first results[J].Planetery and Space Science,2006,54:472-486.
[15]Parrot M,Benoist D,Berthelier J J,et al.The magnetic field experiment IMSC and its data processingonboard DEMETER:scientific objectives,description and first results[J].Planetary and Space Science,2006,54:441-455.
[16]Sauvaud J A,Moreau T,Maggiolo R,et al.High energy electron detection onboard DEMETER:The IDPspectrometer,description and first results on the inner belt[J].Planetery and Space science,2006,54:502-511.
[17]朱荣,杨冬梅,荆凤,等.DEMETER卫星观测到的云南普洱地震前的电离层扰动[J].地震学报,2008,30(1):76-81.
[18]欧阳新艳,张学民,申旭辉,等.普洱地震前电离层电子密度扰动变化研究[J].地震学报,2008,30(4):424-436.
[19]Lagoutte D,Brochot J Y,Latremoliere P.Analysis tools[M].May 2000,LPCE/NI/003.E-PART.
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