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地电和地磁的波动是几种地球物理现象的终极产物,特别是在地震活动区域观测到的这类信号可以归因于和地震相关的压力及张力的变化。该问题的复杂性促使了利用先进的统计方法对这些波动的不同一性特征进行研究。本文分析了日本地震活动最频繁的地区之一Boso半岛南部的K iyosum i,Uchiura和Fudago观测站观测到的地电位和地磁场的短期变化的时间动态特征。为了在地电位数据的基础上了解异常信号及背景噪声的特征,我们研究了信号到达的方向。利用观测站间的转移函数的方法对外部强信号的减弱进行了研究。这些分析显示出了区分信号源的能力,特别是时序数据的定向探测分析显示了其对信号源分离的有效性。波形的识别和信号到达方向的估测对于监控地震活动区域的ULF电磁环境和了解地壳活动的孕震过程都是非常重要的。
Geoelectric and geomagnetic fluctuations are the ultimate products of several geophysical phenomena. In particular, such signals observed in seismic areas can be attributed to changes in pressure and tension associated with earthquakes. The complexity of the issue has prompted the use of advanced statistical methods to study the different characteristics of these fluctuations. This paper analyzes the temporal dynamics of short-term changes in ground potential and geomagnetic field observed by the Kiyosum i, Uchiura and Fudago observatories in southern Boso Peninsula, one of the areas with the highest seismic activity in Japan. In order to understand the characteristics of anomalous signals and background noise on the basis of ground potential data, we study the direction of signal arrival. The weakening of external strong signal is studied by using the transfer function between observatories. These analyzes show the ability to distinguish between sources, and in particular the directional sounding analysis of timing data shows its effectiveness in signal source separation. Waveform identification and signal arrival direction estimation are very important for monitoring the ULF electromagnetic environment in the seismic activity area and understanding the seismogenic process of the crustal activity.