Geoelectric Characteristics of Mito, Kakioka, Aizu and Numazu Regions Revealed by the Analysis of the Geoelectric Field Variations with BAYTAP-G -an evaluation of BAYTAP-G as a means of an analysis of the geoelectric field-
Ozima, M.
Abstract
With the use of BAYTAP-G，the author analized low-frequency geoelectric field variations observed using telecommunication facilities near Mito， Aizu and Numazu and with the conventional method at Kakioka. Focusing attention on the amplitude factor of the frequency response，the amplitude of the tidal coponent and minimum ABIC-value，the author discussed what were derived by this analysis to evaluate BAY TAP-G as a means of an analysis of the geoelectric field. The apparent resistivity derived by the above factor made prominent the contrast between the three regions (Mito， Kakioka and Numazu) and Aizu region. The amplitude of the tidal component also showed a similar distinct contrast between the three regions and Aizu region. The author confirmed that the minimum ABIC-value wel1 correlates with the geomagnetic activity， suggesting that induced component cannot be completely separated in this study. By the use of the third (Z-)component of the geomagnetic field，t he minimum ABIC-value is lowered greatly in winter and little in summer season. This seasonal variation of the role of the Z-component of the geomagnetic field which is lead by a characteristic seasonal variation of the amplitude factor could not be geophysically interpreted in this study. The minimum ABIC-value is further lowered by the use of the advanced associated data of the geomagnetic field.
