Strain accumulation in the southern Alps (NE Italy) and deformation at the northeastern boundary of Adria observed by CGPS measurements

D’Agostino, N.; Cheloni, D.; Mantenuto, S.; Selvaggi, G.; Michelini, Alberto; Zuliani, David

doi:10.1029/2005gl024266

Cited by 77 publications

(88 citation statements)

References 20 publications

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“…The Austrian stations GRMS, SBGZ and GRAZ show eastward velocities, consistent with earlier results (Grenerczy et al, 2000(Grenerczy et al, , 2005D'Agostino et al, 2005;Vrabec et al, 2006;Caporali et al, 2006). Accordingly, stations within, or near, the Pannonian Basin have velocities about 2 mm/year generally oriented to the east (HUTB, DISZ, PENC, STHO, KAME).…”

Section: Adria Dinarides and Pannonian Basinsupporting

confidence: 81%

Geokinematics of Central Europe: New insights from the CERGOP-2/Environment Project

Aichhorn

Becker

Feješ³

et al. 2008

Journal of Geodynamics

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The Central European Geodynamics Project CERGOP-2, funded by the European Union from 2003 to 2006 under the 5th Framework Programme, benefited from repeated measurements of the coordinates of epoch and permanent GPS stations of the Central European GPS Reference Network (CEGRN), starting in 1994. Here we report on the results of the systematic processing of available data up to 2005. The analysis has yielded velocities for some 60 sites, covering a variety of Central European tectonic provinces, from the Adria Indenter to the Tauern Window, the Dinarides, the Pannonian Basin, the Vrancea Seismic Zone and the Carpathian Mountains. The estimated velocities define kinematical patterns which outline, with varying spatial resolution depending on the station density and history, the present-day surface kinematics in Central Europe. Horizontal velocities are analyzed after removal from the ITRF2000 estimated velocities of a rigid rotation accounting for the mean motion of Europe: a ∼2.3 mm/year north-south oriented convergence rate between Adria and the Southern Alps that can be considered to be the present-day velocity of the Adria Indenter relative to the European Foreland. An eastward extrusion zone initiates at the Tauern Window. The lateral eastward flow towards the Pannonian Basin exhibits a gentle gradient from 1 to 1.5 mm/year immediately east of the Tauern Window to zero in the Pannonian Basin. This kinematic continuity implies that the Pannonian plate fragment recently suggested by seismic data does not require a specific Eulerian pole. On the southeastern boundary of the Adria microplate, we report a velocity drop from 4 to 4.5 mm/year motion near Matera to ∼1 mm/year north of the Dinarides, in the southwestern part of the Pannonian Basin. A positive velocity gradient as one moves south from West Ukraine across Rumania and Bulgaria is estimated to be 2 mm/year on a scale of 600-800 km, as if the crust were dragged by the counterclockwise rotation along

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Section: Adria Dinarides and Pannonian Basinsupporting

confidence: 81%

Geokinematics of Central Europe: New insights from the CERGOP-2/Environment Project

Aichhorn

Becker

Feješ³

et al. 2008

Journal of Geodynamics

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“…Creeping dislocations in an elastic half-space are commonly used to model interseismic deformation and have been applied to major intracontinental thrust faults such as the Main Himalayan Thrust [Bilham et al, 1997], Taiwan [Dominguez et al, 2003], and the Eastern Alps [D'Agostino et al, 2005]. Most authors also rely on the seismic cycle model of Savage [1983], a method commonly used in the subduction zones and successfully applied also to the intracontinental thrust faults [Gahalaut and Chander, 1997;Vergne et al, 2001;Ader et al, 2012].…”

Section: Introductionmentioning

confidence: 99%

Interseismic coupling, seismic potential, and earthquake recurrence on the southern front of the Eastern Alps (NE Italy)

2014

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Here we use continuous GPS observations to document the geodetic strain accumulation across the South‐Eastern Alps (NE Italy). We estimate the interseismic coupling on the intracontinental collision thrust fault and discuss the seismic potential and earthquake recurrence. We invert the GPS velocities using the back slip approach to simultaneously estimate the relative angular velocity and the degree of interseismic coupling on the thrust fault that separates the Eastern Alps and the Venetian‐Friulian plain. Comparison between the rigid rotation predicted motion and the shortening observed across the area indicates that the South‐Eastern Alpine thrust front absorbs about 70% of the total convergence between the Adria and Eurasia plates. The coupling is computed on a north dipping fault following the continuous external seismogenic thrust front of the South‐Eastern Alps. The modeled thrust fault is currently locked from the surface to a depth of ≈10 km. The transition zone between locked and creeping portions of the fault roughly corresponds with the belt of microseismicity parallel and to the north of the mountain front. The estimated moment deficit rate is 1.3 ± 0.4 × 1017 Nm/yr. The comparison between the estimated moment deficit and that released historically by the earthquakes suggests that to account for the moment deficit the following two factors or their combination should be considered: (1) a significant part of the observed interseismic coupling is released aseismically and (2) infrequent “large” events with long return period (> 1000 years) and with magnitudes larger than the value assigned to the largest historical events (Mw≈ 6.7).

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“…At present, eastern Alps are characterized by active N-S compression with shortening rates of about 2 mm/yr (Devoti et al, 2011;D'Agostino et al, 2005); the whole Apennine belt displays variable deformation styles, in fact the Adriatic slab retreat generates compression along the frontal Apennines accretionary prism, moving towards NE at a rate of 2-3 mm/yr, and extension along the Apennines chain (Serpelloni et al, 2005;Devoti et al, 2011;Bennett et al, 2012). All these mechanisms generate an inhomogeneous deformation belt, characterized by spatial gradients of velocity field, regardless the extensional or compressive tectonic style (Riguzzi et al, 2012).…”

Section: Física De La Tierramentioning

confidence: 99%

GNSS networks for geodynamics in Italy

2014

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The recent development of GNSS networks in Italy makes it possible to define an increasingly detailed spatial and temporal resolution of the ongoing crustal deformation and to visualize the complex interplay between different orogens in the Africa-Eurasia collision zone. We have analyzed all the available GPS raw data in the time span 1998-2013 obtaining the coordinate time series in a common reference frame. We have finally produced the velocity field providing a detailed picture of the kinematics and deformation pattern of the Italian area. The horizontal velocities with respect to Eurasia are within 7 mm/yr; vertical rates reach about 5 mm/yr along the Apennines and Alpine belts, and -10 mm/yr in the Tyrrhenian backarc area. The deformation rates are greater than 100 nanostrain/yr in volcanic areas and within 80 nanostrain/yr along the Apennines.

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Strain accumulation in the southern Alps (NE Italy) and deformation at the northeastern boundary of Adria observed by CGPS measurements

Cited by 77 publications

References 20 publications

Geokinematics of Central Europe: New insights from the CERGOP-2/Environment Project

Geokinematics of Central Europe: New insights from the CERGOP-2/Environment Project

Interseismic coupling, seismic potential, and earthquake recurrence on the southern front of the Eastern Alps (NE Italy)

GNSS networks for geodynamics in Italy

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