DEMETER卫星磁场波形数据分析方法初探

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...

Discussion on the Analysis Method of Magnetic Field Waveform Data Recorded by the DEMETER Satellite

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.