The role of thermal viscous remanent magnetisation (TVRM) in magnetic changes associated with volcanic eruptions: Insights from the 2000 eruption of Mt Usu,Japan |
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| Authors: | T Hashimoto T Hurst A Suzuki T Mogi Y Yamaya M Tamura |
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| Institution: | 1. Institute of Seismology and Volcanology, Hokkaido University, N10W8, Kita-ku, Sapporo, 060-0810, Japan;2. GNS Science, Ltd., 1 Fairway Drive, Avalon, PO Box 30368, Lower Hutt 5040, New Zealand;3. Geological Survey of Hokkaido, N19W12, Kita-ku, Sapporo, 060-0819, Japan |
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| Abstract: | Volcanic eruptions can produce large magnetic field changes by thermomagnetic effects, especially when magma cools from high temperatures and acquires a permanent magnetisation from the Earth's magnetic field. After the 2000 eruption of Mt Usu, Japan, significant magnetic field changes were observed not only in the vicinity of the magmatic intrusion but also in an area some distance away that was unlikely to be at a temperature near the Curie Point. |
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| Keywords: | Usu volcano magnetic field thermal viscous remanent magnetisation VRM |
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