NissirosV1, Main, Exploration, bibRecordById, Pascal:03-0482836

Inflation/deflation sequence on Nisyros Active Volcano (Greece) during 1995-2000 issued from SAR differential interferometry

Identifieur interne : 000185 ( Main/Exploration ); précédent : 000184; suivant : 000186

Inflation/deflation sequence on Nisyros Active Volcano (Greece) during 1995-2000 issued from SAR differential interferometry

Auteurs : Olga Sykioti [Grèce] ; Charalabos Kontoes [Grèce] ; Panagiotis Elias [Grèce] ; Pierre Briole [France] ; Maria Sachpazi [Grèce] ; Dimitris Paradissis [Grèce] ; Ioannis Kotsis [Grèce]

Source :

SPIE proceedings series [ 1017-2653 ] ; 2003.

RBID : Pascal:03-0482836

Descripteurs français

Pascal (Inist)
- Modélisation, Télédétection, Volcanisme, Radar ouverture synthétique, Grèce, Imagerie radar, Analyse donnée, Observation interférométrique, Volcan actif Nisyros.
Wicri :
- geographic : Grèce.
- topic : Télédétection.

English descriptors

KwdEn :
- Data analysis, Greece, Interferometric observation, Modelling, Radar imaging, Remote sensing, Synthetic-aperture radar, Volcanism.

Abstract

Nisyros is a poorly known Quaternary volcano, south-east of the Aegean volcanic arc. It is characterized by periods of intense seismic activity and paucity in eruptive episodes, sometimes accompanied by hydrothermal explosions. The most recent unrest episode lasted from 1995 to 1998, without eruption. Radar interferometry has been applied in order to study the evolution of the deformation from 1995 to 2000. Observations show a continuous uplift of 140mm during 1995-1997. At mid 1998, the movement trend changes into a slower surface deflation till 2000. Maximum crust deformation is constantly observed at the north-west part of the island, where most earthquake epicenters are located and in agreement to three GPS campaigns conducted between mid 1997 and mid 1998. We solve for the best-fit Mogi point source and best-fit Okada rectangular dislocation of the observed deformation field. Mogi model indicates a source at 5km depth beneath the north-west edge of the island, with a maximum deformation amplitude at surface of 0.14± 0.02m and a total volume change of 26± 4 x 10⁶m³, during 1995-1997. The Okada model indicates a dike solution 2km long, 2.2km wide, with a 4m opening and a 30° dip. The upper center is at 6.4km depth and the volume change, also during 1995-1997, is 17.6 x 10⁶ m³. Each solution is discussed on the potential controlling mechanism resulting to the volcano's inflation/deflation sequence.

Affiliations:

France, Grèce

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Le document en format XML

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<term>Modelling</term>
<term>Radar imaging</term>
<term>Remote sensing</term>
<term>Synthetic-aperture radar</term>
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<front><div type="abstract" xml:lang="en">Nisyros is a poorly known Quaternary volcano, south-east of the Aegean volcanic arc. It is characterized by periods of intense seismic activity and paucity in eruptive episodes, sometimes accompanied by hydrothermal explosions. The most recent unrest episode lasted from 1995 to 1998, without eruption. Radar interferometry has been applied in order to study the evolution of the deformation from 1995 to 2000. Observations show a continuous uplift of 140mm during 1995-1997. At mid 1998, the movement trend changes into a slower surface deflation till 2000. Maximum crust deformation is constantly observed at the north-west part of the island, where most earthquake epicenters are located and in agreement to three GPS campaigns conducted between mid 1997 and mid 1998. We solve for the best-fit Mogi point source and best-fit Okada rectangular dislocation of the observed deformation field. Mogi model indicates a source at 5km depth beneath the north-west edge of the island, with a maximum deformation amplitude at surface of 0.14± 0.02m and a total volume change of 26± 4 x 10<sup>6</sup>
m<sup>3</sup>
, during 1995-1997. The Okada model indicates a dike solution 2km long, 2.2km wide, with a 4m opening and a 30° dip. The upper center is at 6.4km depth and the volume change, also during 1995-1997, is 17.6 x 10<sup>6</sup>
 m<sup>3</sup>
. Each solution is discussed on the potential controlling mechanism resulting to the volcano's inflation/deflation sequence.</div>
</front>
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<tree><country name="Grèce"><noRegion><name sortKey="Sykioti, Olga" sort="Sykioti, Olga" uniqKey="Sykioti O" first="Olga" last="Sykioti">Olga Sykioti</name>
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Inflation/deflation sequence on Nisyros Active Volcano (Greece) during 1995-2000 issued from SAR differential interferometry

Inflation/deflation sequence on Nisyros Active Volcano (Greece) during 1995-2000 issued from SAR differential interferometry

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