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AGU: Journal of Geophysical Research, Solid Earth

 

Keywords

  • Adriatic
  • GPS
  • Mediterranean

Index Terms

  • Tectonophysics: Plate boundary: general
  • Tectonophysics: Continental tectonics: general
  • Geodesy and Gravity: Tectonic deformation
  • Geodesy and Gravity: Satellite geodesy: results
  • Tectonophysics: Plate motions: present and recent
Abstract
Cited By (0)
 

Abstract

Active tectonics of the Adriatic region from GPS and earthquake slip vectors

N. D'Agostino

Sezione di Sismologia e Tettonofisica, Istituto Nazionale di Geofisica e Vulcanologia, Rome, Italy

A. Avallone

Istituto Nazionale di Geofisica e Vulcanologia, Centro Nazionale Terremoti, Rome, Italy

D. Cheloni

Istituto Nazionale di Geofisica e Vulcanologia, Centro Nazionale Terremoti, Rome, Italy

E. D'Anastasio

Istituto Nazionale di Geofisica e Vulcanologia, Centro Nazionale Terremoti, Rome, Italy

S. Mantenuto

Istituto Nazionale di Geofisica e Vulcanologia, Centro Nazionale Terremoti, Rome, Italy

G. Selvaggi

Istituto Nazionale di Geofisica e Vulcanologia, Centro Nazionale Terremoti, Rome, Italy

To investigate the kinematics of the Adriatic region, we integrate continuous and episodic GPS measurements with M w > 4.5 earthquake slip vectors selected from the Regional Centroid Moment Tensor catalogue. Coherent motion of GPS sites in the Po Valley, in Apulia, and in the Hyblean Plateau allows us to estimate geodetically constrained angular velocities for these regions. The predictions of the GPS-inferred angular velocities are compared with the earthquake slip vectors, showing that the seismically expressed deformation at the microplate boundaries is consistent with the observed geodetic motion. The remarkable consistency between geodetic, seismological, and geological evidence of active tectonics suggests that active deformation in the central Adriatic is controlled by the relative motion between the Adria and Apulia microplates. The microplates' angular rotation rates are then compared with the rotation rates calculated with a simple block model supporting the hypotheses (1) that Apulia forms a single microplate with the Ionian Sea and possibly with the Hyblean region and (2) that Adria and Apulia rotate in such a way as to accommodate the Eurasia-Nubia relative motion. We suggest that the present-day microplate configuration follows a recent fragmentation of the Adriatic promontory that during the Neogene rigidly transferred the Africa motion to the orogenic belts that now surround the Adriatic region.

Received 10 June 2008; accepted 15 October 2008; published 27 December 2008.

Citation: D'Agostino, N., A. Avallone, D. Cheloni, E. D'Anastasio, S. Mantenuto, and G. Selvaggi (2008), Active tectonics of the Adriatic region from GPS and earthquake slip vectors, J. Geophys. Res., 113, B12413, doi:10.1029/2008JB005860.

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