Relationship between helium isotopes and focal depths of low-frequency earthquake, Northeastern Japan
Abstract Low-frequency earthquakes (LFEs) observed around volcanoes are often interpreted as reflecting the boundary of the magma transport channels or magma reservoirs. On the other hand, the occurrence of mantle-derived helium is closely related to current or recent magmatism in subduction zones,...
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| Format: | Article |
| Language: | English |
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SpringerOpen
2025-05-01
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| Series: | Geoscience Letters |
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| Online Access: | https://doi.org/10.1186/s40562-025-00394-6 |
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| author | Yukino Yamazaki Arisa Narita Koji Umeda Hirochika Sumino Takuto Maeda Tadashi Amano |
| author_facet | Yukino Yamazaki Arisa Narita Koji Umeda Hirochika Sumino Takuto Maeda Tadashi Amano |
| author_sort | Yukino Yamazaki |
| collection | DOAJ |
| description | Abstract Low-frequency earthquakes (LFEs) observed around volcanoes are often interpreted as reflecting the boundary of the magma transport channels or magma reservoirs. On the other hand, the occurrence of mantle-derived helium is closely related to current or recent magmatism in subduction zones, owing to mantle melting being the primary mechanism for the transfer of primordial 3He from the mantle to the lithosphere. The elevated 3He/4He ratios observed surrounding volcanoes could indicate the presence of a magmatic plumbing system. Therefore, it is meaningful to investigate the relationship between the helium isotope variations and the location of LFEs in volcanic regions. There appears to be good correlation between helium isotope ratios and focal depths of LFEs observed in 31 volcanic regions of Northeast Japan. The helium isotope ratio increases as the focal depth of the low-frequency earthquake decreases. These findings indicate that the shallower the depth of the magma reservoir, the smaller the contamination of primordial helium with crustal radiogenic helium, resulting in higher helium isotopes observed at the surface. Many volcanic hazard factors, such as the probability and duration of an eruption, the eruption style, and the probability of triggering large landslides or caldera collapses, are related to the depth of the magma source. Combining helium isotope monitoring with low-frequency earthquake observations has the potential to improve the reliability of future eruption prediction. |
| format | Article |
| id | doaj-art-fb664a1520784b80b6fb1eca71f05bf0 |
| institution | Kabale University |
| issn | 2196-4092 |
| language | English |
| publishDate | 2025-05-01 |
| publisher | SpringerOpen |
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| series | Geoscience Letters |
| spelling | doaj-art-fb664a1520784b80b6fb1eca71f05bf02025-08-20T03:53:12ZengSpringerOpenGeoscience Letters2196-40922025-05-0112111310.1186/s40562-025-00394-6Relationship between helium isotopes and focal depths of low-frequency earthquake, Northeastern JapanYukino Yamazaki0Arisa Narita1Koji Umeda2Hirochika Sumino3Takuto Maeda4Tadashi Amano5Graduate School of Sustainable Community Studies, Hirosaki UniversityGraduate School of Science and Technology, Hirosaki UniversityGraduate School of Science and Technology, Hirosaki UniversityResearch Center for Advanced Science and Technology, The University of TokyoGraduate School of Science and Technology, Hirosaki UniversityElectric Power Development Co., Ltd.Abstract Low-frequency earthquakes (LFEs) observed around volcanoes are often interpreted as reflecting the boundary of the magma transport channels or magma reservoirs. On the other hand, the occurrence of mantle-derived helium is closely related to current or recent magmatism in subduction zones, owing to mantle melting being the primary mechanism for the transfer of primordial 3He from the mantle to the lithosphere. The elevated 3He/4He ratios observed surrounding volcanoes could indicate the presence of a magmatic plumbing system. Therefore, it is meaningful to investigate the relationship between the helium isotope variations and the location of LFEs in volcanic regions. There appears to be good correlation between helium isotope ratios and focal depths of LFEs observed in 31 volcanic regions of Northeast Japan. The helium isotope ratio increases as the focal depth of the low-frequency earthquake decreases. These findings indicate that the shallower the depth of the magma reservoir, the smaller the contamination of primordial helium with crustal radiogenic helium, resulting in higher helium isotopes observed at the surface. Many volcanic hazard factors, such as the probability and duration of an eruption, the eruption style, and the probability of triggering large landslides or caldera collapses, are related to the depth of the magma source. Combining helium isotope monitoring with low-frequency earthquake observations has the potential to improve the reliability of future eruption prediction.https://doi.org/10.1186/s40562-025-00394-6Helium isotopeLow-frequency earthquakeMagma plumbing system |
| spellingShingle | Yukino Yamazaki Arisa Narita Koji Umeda Hirochika Sumino Takuto Maeda Tadashi Amano Relationship between helium isotopes and focal depths of low-frequency earthquake, Northeastern Japan Geoscience Letters Helium isotope Low-frequency earthquake Magma plumbing system |
| title | Relationship between helium isotopes and focal depths of low-frequency earthquake, Northeastern Japan |
| title_full | Relationship between helium isotopes and focal depths of low-frequency earthquake, Northeastern Japan |
| title_fullStr | Relationship between helium isotopes and focal depths of low-frequency earthquake, Northeastern Japan |
| title_full_unstemmed | Relationship between helium isotopes and focal depths of low-frequency earthquake, Northeastern Japan |
| title_short | Relationship between helium isotopes and focal depths of low-frequency earthquake, Northeastern Japan |
| title_sort | relationship between helium isotopes and focal depths of low frequency earthquake northeastern japan |
| topic | Helium isotope Low-frequency earthquake Magma plumbing system |
| url | https://doi.org/10.1186/s40562-025-00394-6 |
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