NissirosV1, Main, Exploration, bibRecord, 000169

Ground deformation of Nisyros Volcano (Greece) for the period 1995-2002 : Results from DInSAR and DGPS observations

Identifieur interne : 000169 ( Main/Exploration ); précédent : 000168; suivant : 000170

Ground deformation of Nisyros Volcano (Greece) for the period 1995-2002 : Results from DInSAR and DGPS observations

Auteurs : E. Lagios [Grèce] ; V. Sakkas [Grèce] ; Is. Parcharidis [Grèce] ; V. Dietrich [Suisse]

Source :

Bulletin of volcanology [ 0258-8900 ] ; 2005.

RBID : Pascal:06-0130830

Descripteurs français

Pascal (Inist)
- Déformation, Volcan, Système GPS, Radar antenne synthétique, Champ volcanique, Arc volcanique, Réseau, Surrection, Déplacement, Extension, Modèle, Faille, Profondeur, Off shore, Amplitude, Réactivation, Rupture, Caldeira, Contrainte, Interférométrie, Imagerie, Grèce, Ile Cos.
Wicri :
- geographic : Grèce.

English descriptors

KwdEn :
- Global Positioning System, Greece, Kos, amplitude, calderas, deformation, depth, displacements, extension, faults, imagery, interferometry, models, networks, offshore, reactivation, rupture, stress, synthetic aperture radar, uplifts, volcanic arcs, volcanic fields, volcanoes.

Abstract

Differential GPS (DGPS) and Differential Interferometric Synthetic Aperture Radar (DInSAR) analyses were applied to the Kos-Yali-Nisyros Volcanic Field (SE Hellenic Volcanic Arc) to quantify the ground deformation of Nisyros Volcano. After intense seismic activity in 1996, a GPS network was installed in June 1997 and re-occupied annually up to 2002. A general uplift ranging from 14 to 140 mm was determined at all stations of the network. The corresponding horizontal displacements ranged from 13 to 53 mm. The displacement vectors indicate that the island is undergoing extension towards the East, West and South. A two-source "Mogi" model combined with assumed motion along the Mandraki Fault was constructed to fit the observed deformation. The best-fit model assumes sources at a depth of 5500 m NW of the centre of the island and at 6500 m offshore ESE of Yali Island. DInSAR analysis using four pairs of images taken between May 1995 and September 2000 suggests that deformation was occurring during 1995 before the start of the seismic crisis. An amplitude of at least 56 mm along the slant range appeared for the period 1996 through 1999. This deformation is consistent with the two-source model invoked in DGPS modelling. Surface evidence of ground deformation is expressed in the contemporaneous reactivation of the Mandraki Fault. In addition, a 600 m long N-S trending irregular rupture in the caldera floor was formed between 2001 and 2002. This rupture is interpreted as the release of surface stress in the consolidated epiclastic and hydrothermal sediments of the caldera floor.

Affiliations:

Grèce, Suisse

Links toward previous steps (curation, corpus...)

to stream PascalFrancis, to step Corpus: 000024
to stream PascalFrancis, to step Curation: 000016
to stream PascalFrancis, to step Checkpoint: 000029
to stream Main, to step Merge: 000171
to stream Main, to step Curation: 000169

Le document en format XML

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<front><div type="abstract" xml:lang="en">Differential GPS (DGPS) and Differential Interferometric Synthetic Aperture Radar (DInSAR) analyses were applied to the Kos-Yali-Nisyros Volcanic Field (SE Hellenic Volcanic Arc) to quantify the ground deformation of Nisyros Volcano. After intense seismic activity in 1996, a GPS network was installed in June 1997 and re-occupied annually up to 2002. A general uplift ranging from 14 to 140 mm was determined at all stations of the network. The corresponding horizontal displacements ranged from 13 to 53 mm. The displacement vectors indicate that the island is undergoing extension towards the East, West and South. A two-source "Mogi" model combined with assumed motion along the Mandraki Fault was constructed to fit the observed deformation. The best-fit model assumes sources at a depth of 5500 m NW of the centre of the island and at 6500 m offshore ESE of Yali Island. DInSAR analysis using four pairs of images taken between May 1995 and September 2000 suggests that deformation was occurring during 1995 before the start of the seismic crisis. An amplitude of at least 56 mm along the slant range appeared for the period 1996 through 1999. This deformation is consistent with the two-source model invoked in DGPS modelling. Surface evidence of ground deformation is expressed in the contemporaneous reactivation of the Mandraki Fault. In addition, a 600 m long N-S trending irregular rupture in the caldera floor was formed between 2001 and 2002. This rupture is interpreted as the release of surface stress in the consolidated epiclastic and hydrothermal sediments of the caldera floor.</div>
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Ground deformation of Nisyros Volcano (Greece) for the period 1995-2002 : Results from DInSAR and DGPS observations

Ground deformation of Nisyros Volcano (Greece) for the period 1995-2002 : Results from DInSAR and DGPS observations

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri