On a large magmatic fluid reservoir oblique to the volcanic front in the southern part of NE Japan revealed by the magnetotelluric survey
Abstract Many active volcanoes and various types of seismic activities exist in the southern part of the Northeast Japan subduction zone. One of the geologically most interesting features in this area is the sequential explosive eruptions of a group of volcanoes. The group consists of Mt. Azuma and...
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| Format: | Article |
| Language: | English |
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SpringerOpen
2023-09-01
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| Series: | Earth, Planets and Space |
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| Online Access: | https://doi.org/10.1186/s40623-023-01899-0 |
| _version_ | 1797577524462485504 |
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| author | Dieno Diba Makoto Uyeshima Masahiro Ichiki Shin’ya Sakanaka Makoto Tamura Yiren Yuan Marceau Gresse Yusuke Yamaya Yoshiya Usui |
| author_facet | Dieno Diba Makoto Uyeshima Masahiro Ichiki Shin’ya Sakanaka Makoto Tamura Yiren Yuan Marceau Gresse Yusuke Yamaya Yoshiya Usui |
| author_sort | Dieno Diba |
| collection | DOAJ |
| description | Abstract Many active volcanoes and various types of seismic activities exist in the southern part of the Northeast Japan subduction zone. One of the geologically most interesting features in this area is the sequential explosive eruptions of a group of volcanoes. The group consists of Mt. Azuma and Mt. Adatara on the volcanic front line, Mt. Bandai west of the volcanic front, and Mt. Numazawa on the back-arc side. A previous petrological study on the eruption products regarded Mt. Numazawa as an anomalous back-arc volcano because its lavas are similar to those of volcanoes on the volcanic front. The reason behind this unique connection was unclear, and hence, this study was intended to understand the deep fluids distribution beneath the area. For this purpose, a 3-D regional electrical resistivity structure was estimated from a series of wide-band magnetotelluric surveys, with 45 observation points deployed from the fore-arc to the back-arc sides. The most important feature of the resistivity structure is a large conductive zone in the central part of the area, spanning from the upper mantle to the lower crust. Interestingly, the lateral elongation of the conductor is oblique to the volcanic front line and consistent with the spatial distribution of the group of volcanoes and the low-frequency earthquake clusters around them. Therefore, the conductor most likely represents a large, elongated magmatic fluid reservoir beneath the volcanoes. Hydrous partial melting might be the cause of the enhanced conductivity. Graphical Abstract |
| first_indexed | 2024-03-10T22:09:33Z |
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| id | doaj.art-9a6a69d76bb3470f9fffbb7fec8e083c |
| institution | Directory Open Access Journal |
| issn | 1880-5981 |
| language | English |
| last_indexed | 2024-03-10T22:09:33Z |
| publishDate | 2023-09-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Earth, Planets and Space |
| spelling | doaj.art-9a6a69d76bb3470f9fffbb7fec8e083c2023-11-19T12:38:54ZengSpringerOpenEarth, Planets and Space1880-59812023-09-0175111010.1186/s40623-023-01899-0On a large magmatic fluid reservoir oblique to the volcanic front in the southern part of NE Japan revealed by the magnetotelluric surveyDieno Diba0Makoto Uyeshima1Masahiro Ichiki2Shin’ya Sakanaka3Makoto Tamura4Yiren Yuan5Marceau Gresse6Yusuke Yamaya7Yoshiya Usui8Earthquake Research Institute, The University of TokyoEarthquake Research Institute, The University of TokyoGraduate School of Science, Tohoku UniversityGraduate School of International Resource Sciences, Akita UniversityResearch Institute of Energy, Environment, and Geology, Hokkaido Research OrganizationEarthquake Research Institute, The University of TokyoEarthquake Research Institute, The University of TokyoFukushima Renewable Energy Institute, National Institute of Advanced Industrial Science and TechnologyEarthquake Research Institute, The University of TokyoAbstract Many active volcanoes and various types of seismic activities exist in the southern part of the Northeast Japan subduction zone. One of the geologically most interesting features in this area is the sequential explosive eruptions of a group of volcanoes. The group consists of Mt. Azuma and Mt. Adatara on the volcanic front line, Mt. Bandai west of the volcanic front, and Mt. Numazawa on the back-arc side. A previous petrological study on the eruption products regarded Mt. Numazawa as an anomalous back-arc volcano because its lavas are similar to those of volcanoes on the volcanic front. The reason behind this unique connection was unclear, and hence, this study was intended to understand the deep fluids distribution beneath the area. For this purpose, a 3-D regional electrical resistivity structure was estimated from a series of wide-band magnetotelluric surveys, with 45 observation points deployed from the fore-arc to the back-arc sides. The most important feature of the resistivity structure is a large conductive zone in the central part of the area, spanning from the upper mantle to the lower crust. Interestingly, the lateral elongation of the conductor is oblique to the volcanic front line and consistent with the spatial distribution of the group of volcanoes and the low-frequency earthquake clusters around them. Therefore, the conductor most likely represents a large, elongated magmatic fluid reservoir beneath the volcanoes. Hydrous partial melting might be the cause of the enhanced conductivity. Graphical Abstracthttps://doi.org/10.1186/s40623-023-01899-0Southern part of NE JapanArc magmatismSubsurface fluids distributionElectrical resistivity structureMagnetotelluric method |
| spellingShingle | Dieno Diba Makoto Uyeshima Masahiro Ichiki Shin’ya Sakanaka Makoto Tamura Yiren Yuan Marceau Gresse Yusuke Yamaya Yoshiya Usui On a large magmatic fluid reservoir oblique to the volcanic front in the southern part of NE Japan revealed by the magnetotelluric survey Earth, Planets and Space Southern part of NE Japan Arc magmatism Subsurface fluids distribution Electrical resistivity structure Magnetotelluric method |
| title | On a large magmatic fluid reservoir oblique to the volcanic front in the southern part of NE Japan revealed by the magnetotelluric survey |
| title_full | On a large magmatic fluid reservoir oblique to the volcanic front in the southern part of NE Japan revealed by the magnetotelluric survey |
| title_fullStr | On a large magmatic fluid reservoir oblique to the volcanic front in the southern part of NE Japan revealed by the magnetotelluric survey |
| title_full_unstemmed | On a large magmatic fluid reservoir oblique to the volcanic front in the southern part of NE Japan revealed by the magnetotelluric survey |
| title_short | On a large magmatic fluid reservoir oblique to the volcanic front in the southern part of NE Japan revealed by the magnetotelluric survey |
| title_sort | on a large magmatic fluid reservoir oblique to the volcanic front in the southern part of ne japan revealed by the magnetotelluric survey |
| topic | Southern part of NE Japan Arc magmatism Subsurface fluids distribution Electrical resistivity structure Magnetotelluric method |
| url | https://doi.org/10.1186/s40623-023-01899-0 |
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