Self-Potential Studies in Volcanic Areas (5)

We performed SP profiling or mapping in three volcanic fields, Rishiri (northern Hokkaido), Kusatsu-Shirane (central Honshu) and White Island (northern New Zealand). The SP profile on the western flank of Rishiri volcano showed a remark-able high in the summit side, which is similar to many other ac...

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Bibliographic Details
Main Authors: White Isl, Takeshi Hashimoto, Tohru Mogj, Yasunori Nishida, Yasuo Ogawa, Naoto Ujihara, Mitsuhiro Oikawa, Masaki Saito, Shoei Mizuhashp
Other Authors: The Pennsylvania State University CiteSeerX Archives
Format: Text
Language:English
Published: 2004
Subjects:
New Zealand
White Island
Online Access:http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.492.8217
http://eprints.lib.hokudai.ac.jp/dspace/bitstream/2115/8876/1/12(2)_p97-113.pdf
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Summary:We performed SP profiling or mapping in three volcanic fields, Rishiri (northern Hokkaido), Kusatsu-Shirane (central Honshu) and White Island (northern New Zealand). The SP profile on the western flank of Rishiri volcano showed a remark-able high in the summit side, which is similar to many other active volcanoes. Assuming a negative s-potential, it is likely that Rishiri volcano has a large hydroth-ermal circulation system, and therefore, still has enough thermal energy to maintain this circulation. Kusatsu-Shirane volcano inversely showed a decreasing trend toward the summit. It is a contradictive result to the previous knowledge that a volcano with remarkable hydrothermal system shows negative SP on the top. We suspect that the low pH of ground water in this area makes s-potential null or positive, resulting in the reversed surface SP profile to ordinary cases. This idea

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