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

Sykioti, O; Kontoes, C; Elias, P; Briole, P; Sachpazi, M; Paradissis, D; Kotsis, I

dc.contributor.author	Sykioti, O	en
dc.contributor.author	Kontoes, C	en
dc.contributor.author	Elias, P	en
dc.contributor.author	Briole, P	en
dc.contributor.author	Sachpazi, M	en
dc.contributor.author	Paradissis, D	en
dc.contributor.author	Kotsis, I	en
dc.date.accessioned	2014-03-01T02:49:14Z
dc.date.available	2014-03-01T02:49:14Z
dc.date.issued	2002	en
dc.identifier.issn	0277786X	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/34429
dc.subject	Aegean	en
dc.subject	ERS2	en
dc.subject	InSAR	en
dc.subject	Interferometry	en
dc.subject	Modeling	en
dc.subject	Nisyros	en
dc.subject	Remote sensing	en
dc.subject	Volcanism	en
dc.subject.other	Computer simulation	en
dc.subject.other	Earthquakes	en
dc.subject.other	Global positioning system	en
dc.subject.other	Remote sensing	en
dc.subject.other	Seismic waves	en
dc.subject.other	Seismology	en
dc.subject.other	Synthetic aperture radar	en
dc.subject.other	Volcanoes	en
dc.subject.other	Nisyros	en
dc.subject.other	Surface deflation	en
dc.subject.other	Synthetic aperture radar differential interferometry	en
dc.subject.other	Volcanism	en
dc.subject.other	Interferometry	en
dc.title	Inflation/deflation sequence on Nisyros active volcano (Greece) during 1995-2000 issued from SAR differential interferometry	en
heal.type	conferenceItem	en
heal.identifier.primary	10.1117/12.463490	en
heal.identifier.secondary	http://dx.doi.org/10.1117/12.463490	en
heal.publicationDate	2002	en
heal.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 × 106 m3, 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 × 106 m3. Each solution is discussed on the potential controlling mechanism resulting to the volcano's inflation/deflation sequence.	en
heal.journalName	Proceedings of SPIE - The International Society for Optical Engineering	en
dc.identifier.doi	10.1117/12.463490	en
dc.identifier.volume	4886	en
dc.identifier.spage	315	en
dc.identifier.epage	321	en