Shrinking of Ischia Island (Italy) from Long-Term Geodetic Data: Implications for the Deflation Mechanisms of Resurgent Calderas and Their Relationships with Seismicity

The identification of the mechanisms responsible for the deformation of calderas is of primary importance for our understanding of the dynamics of magmatic systems and the evaluation of volcanic hazards. We analyze twenty years (1997–2018) of geodetic measurements on Ischia Island (Italy), which inc...

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Autores principales:	Alessandro Galvani, Giuseppe Pezzo, Vincenzo Sepe, Guido Ventura
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	GNSS velocity field resurgent caldera subsidence earthquakes degassing processes Science Q
Acceso en línea:	https://doaj.org/article/90bc59f02c0749af80b95c6d4d8f0086
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spelling	oai:doaj.org-article:90bc59f02c0749af80b95c6d4d8f00862021-11-25T18:55:05ZShrinking of Ischia Island (Italy) from Long-Term Geodetic Data: Implications for the Deflation Mechanisms of Resurgent Calderas and Their Relationships with Seismicity10.3390/rs132246482072-4292https://doaj.org/article/90bc59f02c0749af80b95c6d4d8f00862021-11-01T00:00:00Zhttps://www.mdpi.com/2072-4292/13/22/4648https://doaj.org/toc/2072-4292The identification of the mechanisms responsible for the deformation of calderas is of primary importance for our understanding of the dynamics of magmatic systems and the evaluation of volcanic hazards. We analyze twenty years (1997–2018) of geodetic measurements on Ischia Island (Italy), which include the Mt. Epomeo resurgent block, and is affected by hydrothermal manifestations and shallow seismicity. The data from the GPS Network and the leveling route show a constant subsidence with values up to −15 ± 2.0 mm/yr and a centripetal displacement rate with the largest deformations on the southern flank of Mt. Epomeo. The joint inversion of GPS and levelling data is consistent with a 4 km deep source deflating by degassing and magma cooling below the southern flank of Mt. Epomeo. The depth of the source is supported by independent geophysical data. The Ischia deformation field is not related to the instability of the resurgent block or extensive gravity or tectonic processes. The seismicity reflects the dynamics of the shallow hydrothermal system being neither temporally nor spatially related to the deflation.Alessandro GalvaniGiuseppe PezzoVincenzo SepeGuido VenturaMDPI AGarticleGNSSvelocity fieldresurgent calderasubsidenceearthquakesdegassing processesScienceQENRemote Sensing, Vol 13, Iss 4648, p 4648 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	GNSS velocity field resurgent caldera subsidence earthquakes degassing processes Science Q
spellingShingle	GNSS velocity field resurgent caldera subsidence earthquakes degassing processes Science Q Alessandro Galvani Giuseppe Pezzo Vincenzo Sepe Guido Ventura Shrinking of Ischia Island (Italy) from Long-Term Geodetic Data: Implications for the Deflation Mechanisms of Resurgent Calderas and Their Relationships with Seismicity
description	The identification of the mechanisms responsible for the deformation of calderas is of primary importance for our understanding of the dynamics of magmatic systems and the evaluation of volcanic hazards. We analyze twenty years (1997–2018) of geodetic measurements on Ischia Island (Italy), which include the Mt. Epomeo resurgent block, and is affected by hydrothermal manifestations and shallow seismicity. The data from the GPS Network and the leveling route show a constant subsidence with values up to −15 ± 2.0 mm/yr and a centripetal displacement rate with the largest deformations on the southern flank of Mt. Epomeo. The joint inversion of GPS and levelling data is consistent with a 4 km deep source deflating by degassing and magma cooling below the southern flank of Mt. Epomeo. The depth of the source is supported by independent geophysical data. The Ischia deformation field is not related to the instability of the resurgent block or extensive gravity or tectonic processes. The seismicity reflects the dynamics of the shallow hydrothermal system being neither temporally nor spatially related to the deflation.
format	article
author	Alessandro Galvani Giuseppe Pezzo Vincenzo Sepe Guido Ventura
author_facet	Alessandro Galvani Giuseppe Pezzo Vincenzo Sepe Guido Ventura
author_sort	Alessandro Galvani
title	Shrinking of Ischia Island (Italy) from Long-Term Geodetic Data: Implications for the Deflation Mechanisms of Resurgent Calderas and Their Relationships with Seismicity
title_short	Shrinking of Ischia Island (Italy) from Long-Term Geodetic Data: Implications for the Deflation Mechanisms of Resurgent Calderas and Their Relationships with Seismicity
title_full	Shrinking of Ischia Island (Italy) from Long-Term Geodetic Data: Implications for the Deflation Mechanisms of Resurgent Calderas and Their Relationships with Seismicity
title_fullStr	Shrinking of Ischia Island (Italy) from Long-Term Geodetic Data: Implications for the Deflation Mechanisms of Resurgent Calderas and Their Relationships with Seismicity
title_full_unstemmed	Shrinking of Ischia Island (Italy) from Long-Term Geodetic Data: Implications for the Deflation Mechanisms of Resurgent Calderas and Their Relationships with Seismicity
title_sort	shrinking of ischia island (italy) from long-term geodetic data: implications for the deflation mechanisms of resurgent calderas and their relationships with seismicity
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/90bc59f02c0749af80b95c6d4d8f0086
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Shrinking of Ischia Island (Italy) from Long-Term Geodetic Data: Implications for the Deflation Mechanisms of Resurgent Calderas and Their Relationships with Seismicity

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