A new velocity field for Greece: Implications for the kinematics and dynamics of the Aegean

Floyd, MA; Billiris, H; Paradissis, D; Veis, G; Avallone, A; Briole, P; McClusky, S; Nocquet, J-M; Palamartchouk, K; Parsons, B; England, PC

dc.contributor.author	Floyd, MA	en
dc.contributor.author	Billiris, H	en
dc.contributor.author	Paradissis, D	en
dc.contributor.author	Veis, G	en
dc.contributor.author	Avallone, A	en
dc.contributor.author	Briole, P	en
dc.contributor.author	McClusky, S	en
dc.contributor.author	Nocquet, J-M	en
dc.contributor.author	Palamartchouk, K	en
dc.contributor.author	Parsons, B	en
dc.contributor.author	England, PC	en
dc.date.accessioned	2014-03-01T01:32:29Z
dc.date.available	2014-03-01T01:32:29Z
dc.date.issued	2010	en
dc.identifier.issn	0148-0227	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/20156
dc.subject	Active Tectonics	en
dc.subject	Deformable Model	en
dc.subject	Kinematics and Dynamics	en
dc.subject	Potential Energy	en
dc.subject	Velocity Field	en
dc.subject	Strain Rate	en
dc.subject.classification	Geochemistry & Geophysics	en
dc.subject.other	block rotation	en
dc.subject.other	faulting	en
dc.subject.other	geodetic network	en
dc.subject.other	GPS	en
dc.subject.other	kinematics	en
dc.subject.other	lithospheric structure	en
dc.subject.other	normal fault	en
dc.subject.other	strain rate	en
dc.subject.other	strike-slip fault	en
dc.subject.other	velocity profile	en
dc.subject.other	Aegean Islands	en
dc.subject.other	Greece	en
dc.subject.other	Gulf of Corinth	en
dc.subject.other	Ionian Sea	en
dc.subject.other	Mediterranean Sea	en
dc.subject.other	Peloponnese	en
dc.title	A new velocity field for Greece: Implications for the kinematics and dynamics of the Aegean	en
heal.type	journalArticle	en
heal.identifier.primary	10.1029/2009JB007040	en
heal.identifier.secondary	http://dx.doi.org/10.1029/2009JB007040	en
heal.identifier.secondary	B10403	en
heal.language	English	en
heal.publicationDate	2010	en
heal.abstract	A new set of geodetic velocities for Greece and the Aegean, derived from 254 survey-mode and continuous GPS sites, is used to test kinematic and dynamic models for this area of rapid continental deformation. Modeling the kinematics of the Aegean by the rotation of a small number (3-6) of blocks produces RMS misfits of ∼5 mm yr-1 in the southern Aegean and western Peloponnese, indicating significant internal strain within these postulated blocks. It is possible to fit the observed velocities to within 2-3 mm yr-1 (RMS) by models that contain 10 or more blocks, but many such models can be found, with widely varying arrangements of blocks, that fit the data equally well provided that the horizontal dimension of those blocks is not larger than 100-200 km. A continuous field of velocity calculated from the GPS velocities by assuming that strain rates are homogeneous on the scale of ∼120 km fits the observed velocities to better than 2-3 mm yr-1 (RMS), with systematic misfits, representing more localized strain, confined to a region approximately 100 × 100 km in size around the western Gulf of Corinth. This velocity field accounts for the major active tectonic features of Greece and the Aegean, including the widespread north-south extensional deformation and the distributed strike-slip deformation in the NE Aegean and western Greece. The T axes of earthquakes are aligned with the principal axes of elongation in the geodetic field, major active normal fault systems are perpendicular to those axes, and ∼90% of the large earthquakes in this region during the past 120 years took place within the areas in which the geodetic strain rate exceeds 30 nanostrain yr-1. These observations suggest that the faulting within the upper crust of the Aegean region is driven by forces that are coherent over a scale that is significantly greater than 100 km. It is likely that those forces arise primarily from differences in gravitational potential energy within the lithosphere of the region. Copyright 2010 by the American Geophysical Union.	en
heal.publisher	AMER GEOPHYSICAL UNION	en
heal.journalName	Journal of Geophysical Research B: Solid Earth	en
dc.identifier.doi	10.1029/2009JB007040	en
dc.identifier.isi	ISI:000285774400005	en
dc.identifier.volume	115	en
dc.identifier.issue	10	en