Changes in Rock Properties of Porous Rhyolite through 40, 000 Years in Kozu-shima Island, Japan
نویسندگان
چکیده
منابع مشابه
Heterogeneous electrical structure of Kozu-shima volcanic island, Japan
Nearly twenty anomalous geoelectric field changes were observed before earthquakes at Kozu-shima Island, Japan, from 1997 to 2000. In order to help locating the current sources of the observed anomalous changes, a bipole-dipole resistivity survey was conducted. From the resistivity survey, including current injection into the ground, it was found that various features of the anomalous changes w...
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Following the electric current injection experiment carried out in 2009, a VLF-MT (Very Low Frequency Magnetotelluric) survey has been conducted in Kozu-shima Island to obtain further information on the subterranean electrical structure that might help understanding the results of our monitoring of geoelectric potentials. A number of VAN-type pre-seismic geoelectric potential anomalies were obs...
متن کاملPreseismic anomalous telluric current signals observed in Kozu-shima Island, Japan.
Monitoring of telluric current, which is practically a synonym for geoelectric potential difference, was conducted on Kozu-shima Island about 170 km south of Tokyo from May 14, 1997 to June 25, 2000. During the monitoring period, 19 anomalous telluric current changes (ATCs) were observed. Their possible correlation with nearby earthquakes was statistically examined by assuming various lead time...
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Compaction bands are localized, planar zones of compressed material that form perpendicular to the maximum compressive stress. Compaction bands have been observed in porous sandstone formations in the field and in laboratory compression tests on porous sandstone, plaster, glass beads, polycarbonate honeycombs and metal foams. Because the permeability of the compacted material is much reduced, c...
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ژورنال
عنوان ژورنال: Geographical Review of Japa,. Ser. A, Chirigaku Hyoron
سال: 1994
ISSN: 0016-7444,2185-1735
DOI: 10.4157/grj1984a.67.11_775