Steady subsidence of a repeatedly erupting caldera through InSAR observations: Aso, Japan

Handle URI:
http://hdl.handle.net/10754/623914
Title:
Steady subsidence of a repeatedly erupting caldera through InSAR observations: Aso, Japan
Authors:
Nobile, Adriano; Acocella, Valerio; Ruch, Joel; Aoki, Yosuke; Borgstrom, Sven; Siniscalchi, Valeria; Geshi, Nobuo
Abstract:
The relation between unrest and eruption at calderas is still poorly understood. Aso caldera, Japan, shows minor episodic phreatomagmatic eruptions associated with steady subsidence. We analyse the deformation of Aso using SAR images from 1993 to 2011 and compare it with the eruptive activity. Although the dataset suffers from limitations (e.g. atmospheric effects, coherence loss, low signal-to-noise ratio), we observe a steady subsidence signal from 1996 to 1998, which suggests an overall contraction of a magmatic source below the caldera centre, from 4 to 5 km depth. We propose that the observed contraction may have been induced by the release of the magmatic fluids feeding the eruptions. If confirmed by further data, this hypothesis suggests that degassing processes play a crucial role in triggering minor eruptions within open conduit calderas, such as at Aso. Our study underlines the importance of defining any eruptive potential also from deflating magmatic systems with open conduit.
KAUST Department:
King Abdullah University of Science and Technology, Jeddah, , Saudi Arabia
Citation:
Nobile A, Acocella V, Ruch J, Aoki Y, Borgstrom S, et al. (2017) Steady subsidence of a repeatedly erupting caldera through InSAR observations: Aso, Japan. Bulletin of Volcanology 79. Available: http://dx.doi.org/10.1007/s00445-017-1112-1.
Publisher:
Springer Nature
Journal:
Bulletin of Volcanology
Issue Date:
5-Apr-2017
DOI:
10.1007/s00445-017-1112-1
Type:
Article
ISSN:
0258-8900; 1432-0819
Sponsors:
This study was made in the framework of an ESA Category 1 proposal 7486 (V. Acocella responsible). The Supersite initiative (F. Amelung and S. Gross) is gratefully acknowledged for providing Envisat images. PALSAR level 1.0 data from the ALOS satellite are shared among PIXEL (PALSAR Interferometry Consortium to Study our Evolving Land surface) and provided by the Japan Aerospace Exploration Agency (JAXA) under a cooperative research contract with the Earthquake Research Institute, University of Tokyo. The ownership of PALSAR data belongs to the Ministry of Economy, Trade and Industry, and JAXA. G. Chiodini, E. Sansosti and M. Poland provided useful suggestions on an earlier version of the manuscript. We also would like to thank F. Costa and an anonymous reviewer who provided detailed reviews to improve the manuscript. Finally, thanks to the Associated Editor K.V. Cashman and to the Executive Editor J.D.L. White for additional comments that enhanced this work.
Additional Links:
http://link.springer.com/article/10.1007/s00445-017-1112-1
Appears in Collections:
Articles

Full metadata record

DC FieldValue Language
dc.contributor.authorNobile, Adrianoen
dc.contributor.authorAcocella, Valerioen
dc.contributor.authorRuch, Joelen
dc.contributor.authorAoki, Yosukeen
dc.contributor.authorBorgstrom, Svenen
dc.contributor.authorSiniscalchi, Valeriaen
dc.contributor.authorGeshi, Nobuoen
dc.date.accessioned2017-05-31T11:23:13Z-
dc.date.available2017-05-31T11:23:13Z-
dc.date.issued2017-04-05en
dc.identifier.citationNobile A, Acocella V, Ruch J, Aoki Y, Borgstrom S, et al. (2017) Steady subsidence of a repeatedly erupting caldera through InSAR observations: Aso, Japan. Bulletin of Volcanology 79. Available: http://dx.doi.org/10.1007/s00445-017-1112-1.en
dc.identifier.issn0258-8900en
dc.identifier.issn1432-0819en
dc.identifier.doi10.1007/s00445-017-1112-1en
dc.identifier.urihttp://hdl.handle.net/10754/623914-
dc.description.abstractThe relation between unrest and eruption at calderas is still poorly understood. Aso caldera, Japan, shows minor episodic phreatomagmatic eruptions associated with steady subsidence. We analyse the deformation of Aso using SAR images from 1993 to 2011 and compare it with the eruptive activity. Although the dataset suffers from limitations (e.g. atmospheric effects, coherence loss, low signal-to-noise ratio), we observe a steady subsidence signal from 1996 to 1998, which suggests an overall contraction of a magmatic source below the caldera centre, from 4 to 5 km depth. We propose that the observed contraction may have been induced by the release of the magmatic fluids feeding the eruptions. If confirmed by further data, this hypothesis suggests that degassing processes play a crucial role in triggering minor eruptions within open conduit calderas, such as at Aso. Our study underlines the importance of defining any eruptive potential also from deflating magmatic systems with open conduit.en
dc.description.sponsorshipThis study was made in the framework of an ESA Category 1 proposal 7486 (V. Acocella responsible). The Supersite initiative (F. Amelung and S. Gross) is gratefully acknowledged for providing Envisat images. PALSAR level 1.0 data from the ALOS satellite are shared among PIXEL (PALSAR Interferometry Consortium to Study our Evolving Land surface) and provided by the Japan Aerospace Exploration Agency (JAXA) under a cooperative research contract with the Earthquake Research Institute, University of Tokyo. The ownership of PALSAR data belongs to the Ministry of Economy, Trade and Industry, and JAXA. G. Chiodini, E. Sansosti and M. Poland provided useful suggestions on an earlier version of the manuscript. We also would like to thank F. Costa and an anonymous reviewer who provided detailed reviews to improve the manuscript. Finally, thanks to the Associated Editor K.V. Cashman and to the Executive Editor J.D.L. White for additional comments that enhanced this work.en
dc.publisherSpringer Natureen
dc.relation.urlhttp://link.springer.com/article/10.1007/s00445-017-1112-1en
dc.subjectAsoen
dc.subjectCalderasen
dc.subjectInSARen
dc.subjectMagmatic sourceen
dc.subjectOutgassingen
dc.subjectSubsidenceen
dc.titleSteady subsidence of a repeatedly erupting caldera through InSAR observations: Aso, Japanen
dc.typeArticleen
dc.contributor.departmentKing Abdullah University of Science and Technology, Jeddah, , Saudi Arabiaen
dc.identifier.journalBulletin of Volcanologyen
dc.contributor.institutionRoyal Museum for Central Africa, Leuvenesteenweg 13, Tervuren, 3080, , Belgiumen
dc.contributor.institutionDipartimento Scienze Università Roma Tre, Rome, , Italyen
dc.contributor.institutionEarthquake Research Institute—The University of Tokyo, Tokyo, , Japanen
dc.contributor.institutionINGV—Osservatorio Vesuviano, Naples, , Italyen
dc.contributor.institutionGeological Survey Japan, AIST, Tsukuba, Ibaraki, , Japanen
kaust.authorRuch, Joelen
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