The interplay between global tectonic processes and the seismic cycle in the Umbria-Marche seismogenic region

Details The interplay between global tectonic processes and the seismic cycle in the Umbria-Marche seismogenic region The interplay between global tectonic processes and the seismic cycle in the Umbria-Marche seismogenic region

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003geoji.155.1093g&link_type=abstract

Geophysical Journal International, Volume 155, Issue 4, pp. 1093-1104.

Physics

1

Scientific paper

For the central Apennines, peninsular Italy, a series of tectonic mechanisms are reproduced by means of finite-element models, in order to study the effects of active tectonics on the seismic cycle in the Umbria-Marche seismogenic zone. Continental extension and rift push effects induced by small-scale convection are modelled within 2-D viscoelastic models of the crust-lithosphere system, in vertical cross-sections perpendicular to the strike of the major tectonic structures under study, namely the Apennines and the Colfiorito fault zone, where the 1997 seismic sequence took place. With the aim of constraining the active tectonic mechanisms at the regional scale and the behaviour of the fault in the seismogenic zone at the local scale, modelled baseline rate of change are compared with newly acquired GPS data, retrieved from the two permanent GPS receivers of Camerino (CAME) and Elba (ELBA), deliberately installed along the modelled transect. These receivers are located at both edges of the continental extension in the front of the Apennines, close to the Adriatic Plate in the east, and in the rear of the chain, in the Tyrrhenian domain. The deformation pattern inferred from seismicity and from the geodetic data is consistent with small-scale convection in the Tyrrhenian domain, which reproduces extension in the rear of the Apennines and compression in the front of the chain. A convective mechanism, associated with backarc opening and doming of the asthenosphere, provides an extensional rate, along a baseline connecting two sites in the front of the chain (Camerino) and in its rear (Elba), comparable to the observed baseline rate of change. The viscosity of the lower crust plays a fundamental role in determining the style of stress in the crust-lithosphere system. Once constrained by means of the extensional baseline rate inferred from GPS, the modelled slip across the Colfiorito fault and the modelled earthquake recurrence time are consistent with the 1997 normal fault event and with palaeoseismicity, respectively.

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