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...
Main Authors: | , , , , , , , , |
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Format: | Text |
Language: | English |
Published: |
2004
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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 |
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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