Recent Japanese studies on conductivity anomalies

Details Recent Japanese studies on conductivity anomalies Recent Japanese studies on conductivity anomalies

Jun 1973

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1973pepi....7..213r&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 7, Issue 2, p. 213-216.

Physics

2

Scientific paper

A research team called the ``C.A. (conductivity anomaly) Group'' has been active since the early 1960's in Japan. A number of organized observations of geomagnetic variation anomaly have been carried out by the group. As a result, the overall distribution of Parkinson vectors for short-period variation over Japan has become clear. It seems likely that the anomalously large vertical component as observed in central Japan can be accounted for by assuming a depression of the highly conducting mantle layer beneath Japan, although effects of the sea surrounding Japan on geomagnetic variations are also seen. Such a model seems to harmonize with observations of heat flow, seismic wave velocities and attenuation. Use of the transfer function technique has recently become popular and consequently frequency characteristics of geomagnetic variation anomaly will be thoroughly examined in coming years. Intensive observations of island and peninsula effects on geomagnetic variation have been conducted, sometimes in cooperation with the University of Hawaii. Beautiful reversal of the sign of the vertical component at the northern and southern observation points on an island has often been reported. Numerical work on electromagnetic induction in two-dimensional conductors, thin sheets and so on has also been intensively advanced. It is particularly important to estimate the frequency response of an underground model which is believed to account for the geomagnetic variation anomaly in central Japan.

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