Temporal changes in inflation sources during the 2015 unrest and eruption of Hakone volcano, Japan
Abstract Global navigation satellite system data from Hakone volcano, central Japan, together with GEONET data from the Geospatial Information Authority of Japan, were used to investigate the processes associated with the volcanic activity in 2015, which culminated in a small phreatic eruption in la...
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| Format: | Article |
| Language: | English |
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SpringerOpen
2018-09-01
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| Series: | Earth, Planets and Space |
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| Online Access: | http://link.springer.com/article/10.1186/s40623-018-0923-4 |
| _version_ | 1818023775719915520 |
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| author | Masatake Harada Ryosuke Doke Kazutaka Mannen Kazuhiro Itadera Mikio Satomura |
| author_facet | Masatake Harada Ryosuke Doke Kazutaka Mannen Kazuhiro Itadera Mikio Satomura |
| author_sort | Masatake Harada |
| collection | DOAJ |
| description | Abstract Global navigation satellite system data from Hakone volcano, central Japan, together with GEONET data from the Geospatial Information Authority of Japan, were used to investigate the processes associated with the volcanic activity in 2015, which culminated in a small phreatic eruption in late June 2015. Three deep and shallow sources, namely spherical, open crack, and sill, were employed to elucidate the volcanic processes using the observed GNSS displacements, and the MaGCAP-V software was used to estimate the volumetric changes of these sources. Our detailed analysis shows that a deep inflation source at 6.5 km below sea level started to inflate in late March 2015 at a rate of ~ 9.3 × 104 m3/day until mid-June. The inflation rate then slowed to ~ 2.1 × 104 m3/day and ceased at the end of August 2015. A shallow open crack at 0.8 km above sea level started to inflate in May 2015 at a rate of 1.7 × 103 m3/day. There was no significant volumetric change in the shallow sill source during the volcanic unrest, which is evident from interferometric synthetic aperture radar analysis. The inflation of the deep source continued even after the eruption without a significant slowdown in inflation rate. The inflation stopped in August 2015, approximately 1 month after the eruption ceased. This observation implies that the transportation of magmatic fluid to a deep inflation source (6.5 km) triggered the 2015 unrest. The magmatic fluid may have then migrated from the deep source to the shallow open crack. The phreatic eruption was then caused by the formation of a crack that extended to the surface. However, steam emissions from the vent area during and after the eruption were apparently insufficient to mitigate the internal pressure of the shallow open crack. |
| first_indexed | 2024-12-10T03:49:41Z |
| format | Article |
| id | doaj.art-ff8a219681bd45cfaed646b26f63af35 |
| institution | Directory Open Access Journal |
| issn | 1880-5981 |
| language | English |
| last_indexed | 2024-12-10T03:49:41Z |
| publishDate | 2018-09-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Earth, Planets and Space |
| spelling | doaj.art-ff8a219681bd45cfaed646b26f63af352022-12-22T02:03:19ZengSpringerOpenEarth, Planets and Space1880-59812018-09-017011710.1186/s40623-018-0923-4Temporal changes in inflation sources during the 2015 unrest and eruption of Hakone volcano, JapanMasatake Harada0Ryosuke Doke1Kazutaka Mannen2Kazuhiro Itadera3Mikio Satomura4Hot Springs Research Institute of Kanagawa PrefectureHot Springs Research Institute of Kanagawa PrefectureHot Springs Research Institute of Kanagawa PrefectureHot Springs Research Institute of Kanagawa PrefectureHot Springs Research Institute of Kanagawa PrefectureAbstract Global navigation satellite system data from Hakone volcano, central Japan, together with GEONET data from the Geospatial Information Authority of Japan, were used to investigate the processes associated with the volcanic activity in 2015, which culminated in a small phreatic eruption in late June 2015. Three deep and shallow sources, namely spherical, open crack, and sill, were employed to elucidate the volcanic processes using the observed GNSS displacements, and the MaGCAP-V software was used to estimate the volumetric changes of these sources. Our detailed analysis shows that a deep inflation source at 6.5 km below sea level started to inflate in late March 2015 at a rate of ~ 9.3 × 104 m3/day until mid-June. The inflation rate then slowed to ~ 2.1 × 104 m3/day and ceased at the end of August 2015. A shallow open crack at 0.8 km above sea level started to inflate in May 2015 at a rate of 1.7 × 103 m3/day. There was no significant volumetric change in the shallow sill source during the volcanic unrest, which is evident from interferometric synthetic aperture radar analysis. The inflation of the deep source continued even after the eruption without a significant slowdown in inflation rate. The inflation stopped in August 2015, approximately 1 month after the eruption ceased. This observation implies that the transportation of magmatic fluid to a deep inflation source (6.5 km) triggered the 2015 unrest. The magmatic fluid may have then migrated from the deep source to the shallow open crack. The phreatic eruption was then caused by the formation of a crack that extended to the surface. However, steam emissions from the vent area during and after the eruption were apparently insufficient to mitigate the internal pressure of the shallow open crack.http://link.springer.com/article/10.1186/s40623-018-0923-4GNSSMagma chamberHydrothermal systemOpen crackPhreatic eruptionHakone |
| spellingShingle | Masatake Harada Ryosuke Doke Kazutaka Mannen Kazuhiro Itadera Mikio Satomura Temporal changes in inflation sources during the 2015 unrest and eruption of Hakone volcano, Japan Earth, Planets and Space GNSS Magma chamber Hydrothermal system Open crack Phreatic eruption Hakone |
| title | Temporal changes in inflation sources during the 2015 unrest and eruption of Hakone volcano, Japan |
| title_full | Temporal changes in inflation sources during the 2015 unrest and eruption of Hakone volcano, Japan |
| title_fullStr | Temporal changes in inflation sources during the 2015 unrest and eruption of Hakone volcano, Japan |
| title_full_unstemmed | Temporal changes in inflation sources during the 2015 unrest and eruption of Hakone volcano, Japan |
| title_short | Temporal changes in inflation sources during the 2015 unrest and eruption of Hakone volcano, Japan |
| title_sort | temporal changes in inflation sources during the 2015 unrest and eruption of hakone volcano japan |
| topic | GNSS Magma chamber Hydrothermal system Open crack Phreatic eruption Hakone |
| url | http://link.springer.com/article/10.1186/s40623-018-0923-4 |
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