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Geoelectrical and geomagnetic fluctuations are considered the end product of several geophysical phenomena. In&#13; particular these signals measured in seismically active areas can be attributed to stress and strain changes associated&#13; with earthquakes. The complexity of this problem has suggested the development of advanced sophysticated methods&#13; to investigate the heterogeneous nature of these fluctuations. In this paper, we analyzed the time dynamics of&#13; short-term variability of geoelectrical potential differences and geomagnetic fields obsereved at Kiyosumi (KYS),&#13; Uchiura (UCU), and Fudago (FDG) stations, located in the southern part of Boso Peninsula, one of the most seismically&#13; active areas in Japan. Anomalous changes in electric and magnetic fields are obeserved in mid-night on October&#13; 6, 2002. the anomalous signals observed on October 6, 2002 are different from those originated from the train&#13; and other cultural noises according to the investigation on preferred directions of geoelectric field. The investigation&#13; of simaltaneous geomagnetic field changes suggest that the source of the electromagnetic change might be generated&#13; by underground current because of the polarity pattern oberved at KYS, UCU and FDG. Therefore, electrokinetic&#13; assumption under the ground seems one of the possible solutions for the generation of anomalous signals. It is important&#13; to understand the ULF electromagnetic environment for the study on the preparation process of crustal activity&#13; and systematic understanding both electromagnetic and seismic phenomena

Anomalous geoelectrical and geomagnetic signals observed at Southern Boso Peninsula, Japan