【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。更多还原

【Abstract】 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.更多还原