Subsurface magma movement inferred from extensometer and tiltmeter records during the early stage of the 2018 Shinmoe-dake eruptions, Japan
Abstract We infer the temporal changes in the pressure sources that induced crustal deformation during the 2018 Shinmoe-dake eruption using strain and tilt observations and discern that the deep magmatic activity associated with the early stage of this eruption began approximately 19 h earlier than...
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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/s40623-023-01895-4 |
| _version_ | 1797577495070900224 |
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| author | Koki Yoshinaga Takeshi Matsushima Hiroshi Shimizu Yusuke Yamashita Ken’ichi Yamazaki Shintaro Komatsu Satoshi Fujiwara |
| author_facet | Koki Yoshinaga Takeshi Matsushima Hiroshi Shimizu Yusuke Yamashita Ken’ichi Yamazaki Shintaro Komatsu Satoshi Fujiwara |
| author_sort | Koki Yoshinaga |
| collection | DOAJ |
| description | Abstract We infer the temporal changes in the pressure sources that induced crustal deformation during the 2018 Shinmoe-dake eruption using strain and tilt observations and discern that the deep magmatic activity associated with the early stage of this eruption began approximately 19 h earlier than the previously defined onset of magmatic activity. Distinct tilt changes were observed from around 09:00 on 6 March to 12:00 on 8 March 2018 (JST), coincident with observed lava outflow into the crater and lava dome formation. Existing studies have attributed this tilt change to the onset of the deflation of a spherical pressure source located at ~ 7 km bsl (below sea level) to the northwest of Shinmoe-dake. Here we examine strain and tilt data that were acquired in the Kirishima volcanic group, and we find that the distinct changes in the measured strain at Isa-Yoshimatsu Observatory began at around 14:00 on 5 March. This change can be explained by the deflation of a spherical pressure source, thereby suggesting that the onset of magma ascent was earlier than previously thought. The time variation in the spherical pressure source is estimated using the time-dependent inversion of the Ensemble Kalman Filter; the deflation source ascended from ~ 11 to 7 km bsl during Phase 1 (14:00 on 5 March to 06:00 on 6 March) and descended from 7 to 8 km bsl during Phase 2 (06:00 on 6 March to 12:00 on 8 March). Interferometric synthetic aperture radar analysis suggests that a dike intrusion had occurred just below Shinmoe-dake crater until 5 March, and this inflatable crustal deformation is attributed to the emplacement of residual volcanic fluids from the 2011 eruption. It is also known that the surface eruptive activity increased during Phase 1, including an increase in ash venting from the night of 5 March. These strain and tilt observations, therefore, suggest that magma ascended from ~ 11 km bsl to the magma reservoir at 7 km bsl during Phase 1, followed by a deflation of the magma reservoir during Phase 2 due to the large magma supply to the surface. Graphical Abstract |
| first_indexed | 2024-03-10T22:09:06Z |
| format | Article |
| id | doaj.art-2745cbd0220e4866ade50bae6f648a94 |
| institution | Directory Open Access Journal |
| issn | 1880-5981 |
| language | English |
| last_indexed | 2024-03-10T22:09:06Z |
| publishDate | 2023-09-01 |
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| spelling | doaj.art-2745cbd0220e4866ade50bae6f648a942023-11-19T12:39:06ZengSpringerOpenEarth, Planets and Space1880-59812023-09-0175111610.1186/s40623-023-01895-4Subsurface magma movement inferred from extensometer and tiltmeter records during the early stage of the 2018 Shinmoe-dake eruptions, JapanKoki Yoshinaga0Takeshi Matsushima1Hiroshi Shimizu2Yusuke Yamashita3Ken’ichi Yamazaki4Shintaro Komatsu5Satoshi Fujiwara6Department of Earth and Planetary Sciences, Graduate School of Science, Kyushu UniversityInstitute of Seismology and Volcanology, Faculty of Science, Kyushu UniversityInstitute of Seismology and Volcanology, Faculty of Science, Kyushu UniversityDisaster Prevention Research Institute, Miyazaki Observatory, Kyoto UniversityDisaster Prevention Research Institute, Miyazaki Observatory, Kyoto UniversityDisaster Prevention Research Institute, Miyazaki Observatory, Kyoto UniversityGeospatial Information Authority of JapanAbstract We infer the temporal changes in the pressure sources that induced crustal deformation during the 2018 Shinmoe-dake eruption using strain and tilt observations and discern that the deep magmatic activity associated with the early stage of this eruption began approximately 19 h earlier than the previously defined onset of magmatic activity. Distinct tilt changes were observed from around 09:00 on 6 March to 12:00 on 8 March 2018 (JST), coincident with observed lava outflow into the crater and lava dome formation. Existing studies have attributed this tilt change to the onset of the deflation of a spherical pressure source located at ~ 7 km bsl (below sea level) to the northwest of Shinmoe-dake. Here we examine strain and tilt data that were acquired in the Kirishima volcanic group, and we find that the distinct changes in the measured strain at Isa-Yoshimatsu Observatory began at around 14:00 on 5 March. This change can be explained by the deflation of a spherical pressure source, thereby suggesting that the onset of magma ascent was earlier than previously thought. The time variation in the spherical pressure source is estimated using the time-dependent inversion of the Ensemble Kalman Filter; the deflation source ascended from ~ 11 to 7 km bsl during Phase 1 (14:00 on 5 March to 06:00 on 6 March) and descended from 7 to 8 km bsl during Phase 2 (06:00 on 6 March to 12:00 on 8 March). Interferometric synthetic aperture radar analysis suggests that a dike intrusion had occurred just below Shinmoe-dake crater until 5 March, and this inflatable crustal deformation is attributed to the emplacement of residual volcanic fluids from the 2011 eruption. It is also known that the surface eruptive activity increased during Phase 1, including an increase in ash venting from the night of 5 March. These strain and tilt observations, therefore, suggest that magma ascended from ~ 11 km bsl to the magma reservoir at 7 km bsl during Phase 1, followed by a deflation of the magma reservoir during Phase 2 due to the large magma supply to the surface. Graphical Abstracthttps://doi.org/10.1186/s40623-023-01895-42018 Shinmoe-dake eruptionStrainTiltTime-dependent inversionMagma plumbing systemExtensometer |
| spellingShingle | Koki Yoshinaga Takeshi Matsushima Hiroshi Shimizu Yusuke Yamashita Ken’ichi Yamazaki Shintaro Komatsu Satoshi Fujiwara Subsurface magma movement inferred from extensometer and tiltmeter records during the early stage of the 2018 Shinmoe-dake eruptions, Japan Earth, Planets and Space 2018 Shinmoe-dake eruption Strain Tilt Time-dependent inversion Magma plumbing system Extensometer |
| title | Subsurface magma movement inferred from extensometer and tiltmeter records during the early stage of the 2018 Shinmoe-dake eruptions, Japan |
| title_full | Subsurface magma movement inferred from extensometer and tiltmeter records during the early stage of the 2018 Shinmoe-dake eruptions, Japan |
| title_fullStr | Subsurface magma movement inferred from extensometer and tiltmeter records during the early stage of the 2018 Shinmoe-dake eruptions, Japan |
| title_full_unstemmed | Subsurface magma movement inferred from extensometer and tiltmeter records during the early stage of the 2018 Shinmoe-dake eruptions, Japan |
| title_short | Subsurface magma movement inferred from extensometer and tiltmeter records during the early stage of the 2018 Shinmoe-dake eruptions, Japan |
| title_sort | subsurface magma movement inferred from extensometer and tiltmeter records during the early stage of the 2018 shinmoe dake eruptions japan |
| topic | 2018 Shinmoe-dake eruption Strain Tilt Time-dependent inversion Magma plumbing system Extensometer |
| url | https://doi.org/10.1186/s40623-023-01895-4 |
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