短基線地電位差集中観測による地震予知の研究(第3部地殻活動に伴う電磁波放射の研究)

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It is now recognized that extensive measurements of electric potential using short-span dipole with different dipole length is absolutely necessary for the VAN-method. Therefore we focused our present research program on the measurement in the following two areas; Hokuriku region and Izu Oshima Island. In the former area, 14 stations are now in operation. Noise level at these stations are as quiet as VAN stations in Greece. So far, however, no firm results have been obtained on SES, mainly because there have been no sizable (M>5) event in the region. In the latter area, where some interesting results were obtained earlier, many local short and long-span dipoles have been installed. Some anomalous changes, showing an increased occurrence before the Off East Izu seismic swarms in the past, were shown to be localized only near Okata NTT dipole. Since no swarms have occured after 1989, the nature of the changes in question will not be known until the next swarm comes. In the present research, a NETWORK MT method has been developed through an extensive use of NTT electrodes. The method has revealed the subterranean electrical conductivity structure under Hokkaido with unprecedented scale and reliability. Not only to the VAN research, this was a great contribution to the solid earth geoscience in general. In order to know the sensitivity of a station beforehand, we have plans to make comparative geophysical and geological surveys in both sensitive and insensitive areas in Greece to see if there is any systematic difference between them, in cooperation with the VAN scientists.
1993-03-29

短基線地電位差集中観測による地震予知の研究(第3部地殻活動に伴う電磁波放射の研究)

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短基線地電位差集中観測による地震予知の研究(第3部 地殻活動に伴う電磁波放射の研究)

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短基線地電位差集中観測による地震予知の研究(第3部地殻活動に伴う電磁波放射の研究)