Translated to English from paper in Japanese, originally published in: Memoirs of the Kakioka Magnetic Observatory, Vol.28, No.3 (No.86), pp.1-77, 1989 with permission of the authers.

Geoelectric Observation used by the Telegraphic Facilities of NTT Corporation

Toshio Mori

Contents

1. Introduction
2. Observation method
3. Outline of the observed records
   1. Outline of the records at each observation group
   2. Comparison of the observed record in the same time of a different day
4. Long-term stability
5. Impedance tensor and transfer function
   1. Impedance tensor at the Shimodate group and at Kakioka
   2. Impedance tensor at the Mito group and transfer function at Kakioka
6. Time changes of impedance tensors and transfer functions
7. Elimination of the electrical fields induced by geomagnetic variations - Detection of the anomalous earth potential -
   1. Analysis method by a stochastic differential equation
   2. For geoelectric fields between Kasama and Mito
   3. Application to the data of electrical fields at the Mito group and Z at Kakioka
   4. Spectral analysis
   5. When using per-minute data
   6. Use of the transfer function and impedance tensor
8. Relation to tectonic activities
   1. Relation to the earthquake swarms off the east coast of the Izu Peninsula
   2. Relation to eruptions of Izu-Oshima volcano
   3. Other changes
9. Relation to tide, atmospheric pressure and others
10. Application for research of fault structure
    1. Iriyama fault
    2. Tanna fault
    3. Fujikawa fault
11. Anomalous geoelectric change observed near CA (conductivity anomaly) boundary
12. Electrical observation on the sea floor by making use of the power-feeding arrangement of the Permanent Ocean-Bottom Seismograph Observation System off Boso Peninsula (BSOBS)
13. Conclusions
14. Circumstances of observation and acknowledgements

Copyright (c) 1999 Kakioka Magnetic Observatory, Japan Meteorological Agency. All Rights Reserved.