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Ground deformation at Nisyros volcano (Greece) detected by ERS-2 SAR differential interferometry

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Nisyros is a volcanic island in the south-east of the Aegean volcanic arc. Over the period 1995-1998, the volcano exhibited intense seismic activity without eruption. Production and analysis of satellite radar interferograms, spanning period 1995-2000, showed continuous inflation from 1995 until May 1998 and deflation from mid-1998 to 2000, with the same deformation centre situated at the north-west part of the volcano. Assuming the crust to be an elastic homogenous medium, point source modelling of the deformation field indicates the source of deformation to be located at five kilometres depth beneath the north-west edge of the island. Recorded seismicity trend patterns suggest magma intrusion at depth as the source of the inflation sequence. The recorded migration of hypocentres indicates a probable fluid transport affecting the shallow aquifers resulting in the volcano's deflation.
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Document Type: Research Article

Affiliations: 1: Institute for Space Applications and Remote Sensing, National Observatory of Athens, Metaxa and Vas. Pavlou Str., Palaia Penteli, 15236 Greece; e-mail: sykioti@space.noa.gr 2: UMR-CNRS 7580, D├ępartement de Sismologie, Institut de Physique du Globe de Paris, Paris, France 3: Institute for Geodynamics, National Observatory of Athens, Lofos Nymfon, Thisseion, Greece 4: National Technical University of Athens, Department of Surveying Engineering, Dionysos Satellite Observatory, Athens, Greece

Publication date: 2003-01-01

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