A large self-potential anomaly on Unzen volcano, Shimabra peninsula, Kyushu island, Japan

Details A large self-potential anomaly on Unzen volcano, Shimabra peninsula, Kyushu island, Japan A large self-potential anomaly on Unzen volcano, Shimabra peninsula, Kyushu island, Japan

Feb 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995georl..22..191h&link_type=abstract

Geopysical Research Letters (ISSN 0094-8276), vol. 22, no. 3, p. 191-194

Mathematics

Logic

31

Geological Surveys, Geopotential, Geothermal Anomalies, Hydrothermal Systems, Japan, Volcanoes, Volcanology, Convection, Geothermal Resources, Topography

Scientific paper

Self-potential (SP) observation was carried out in the summit area of Unzen, one of the active volcanoes in Kyushu island, Japan. We found a positive SP anomaly in the vicinity of the newly extruded lava dome. The potential difference across the anomaly exceeds 1000 mV per 500 m. Streaming potentials associated with subsurface hydrothermal convection seem to be the most reasonable mechanism for the positive anomaly. In association with the first emergence of the lava dome a sharp increase of SP was detected, which is considered to be a result of the growth of the hydro-thermal system.

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