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Peer-reviewed Journal Articles, etc >
Post-Eruptive Persistent Cooling Beneath the Summit Crater of Usu Volcano as Revealed by Magnetic Repeat Surveys
| Title: | Post-Eruptive Persistent Cooling Beneath the Summit Crater of Usu Volcano as Revealed by Magnetic Repeat Surveys |
| Authors: | Hashimoto, Takeshi Browse this author →KAKEN DB |
| Keywords: | geomagnetism | | total field | | remagnetization | | cooling | | Usu Volcano |
| Issue Date: | 1-Aug-2022 |
| Publisher: | Fuji Technology Press Ltd. |
| Journal Title: | Journal of Disaster Research |
| Volume: | 17 |
| Issue: | 5 |
| Start Page: | 630 |
| End Page: | 638 |
| Publisher DOI: | 10.20965/jdr.2022.p0630 |
| Abstract: | Remarkable and continuous geomagnetic field change, suggesting remagnetization at a shallow depth, was detected through repeated geomagnetic field observation of the summit area of Mt. Usu Volcano from 2008 to 2021. Long-term cooling of the remnant magma, that intruded during the 1977–82 eruption, was considered responsible for the remagnetization. A magnetic dipole parallel to the present geomagnetic field well reproduced the observation. The modeled source was located near the Ginnuma crater on the south side of the previously inferred intrusive body beneath the Usu-Shinzan cryptodome. Meanwhile, no magnetic source was detected on the other side of the intrusion, implying asymmetric heat transport paths around the intrusion. Considering previous studies on seismicity, geodetic modeling, and resistivity structure, the magnetic source region is plausibly a high permeability zone through which heat from the intruded magma has been efficiently transported. In other words, the source region can be a key monitoring target for future eruptions as it may be linked to the subsurface magma system. |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/86701 |
| Appears in Collections: | 理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 橋本 武志
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