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- W76281661 abstract "The area bounded by the Alpine chain to the North and Mediterranean/Ionian sea to the South is characterized by a wide range of tectonic phenomena, such as the indentation of the Adria block into the Eastern Alp, lateral extrusion of the Tauern Window, unbending of the Adriatic lithosphere, opening of the Thyrrenian sea and subduction of the Ionian lithosphere beneath the Calabrian arc. This ongoing tectonics is accompanied by a relatively intense volcanism and seismicity, which justify the expectation of small but measurable horizontal and vertical displacements. We report on surface horizontal displacements determined at discrete locations by analyzing time series of permanent GPS stations with data coverage from one to five years of continuous operation. The horizontal velocities are defined consistently with the ITRF97 velocity datum. We show that the residual velocities relative to rigid rotations about Eulerian poles are never larger than 5 mm yr and in several cases do reflect qualitatively the expected kinematics. Areas characterized by fracturing and faults with orientations changing on a short scale (Tauern window, Southern Alps) exhibit a more irregular distribution of velocities, probably associated with local phenomena. Eigenvalues and eigenvectors of a mean strain rate tensor are computed by optimally -in a least squares collocation sense -interpolating the station velocities to locations baricentric to clusters of stations. The estimated strain is everywhere smaller than 41 10 yr with a mean uncertainty of 20 10 yr (1σ). The areas with largest strain rate are the Central Apennines and Eastern Alps, while in the Western Alps the estimated strain rate is smaller than 15 -20 10 yr, hence comparable with its uncertainty. The azimuths of the strain rate ellipse are qualitatively compared with the directions of the stress estimated from fault plane mechanisms and borehole breakouts, and with the strike of major faults. The orientations of the strain rate and stress ellipses show remarkable consistency, within the estimated uncertainties. We conclude in favor of evidence of a yet qualitative but significant correlation between broad scale (~300 km) stress and strain rate patterns, and orientation of large scale active lineaments. Introduction" @default.
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- W76281661 date "2001-01-01" @default.
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- W76281661 title "State of strain in the Italian crust from geodetic data" @default.
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