Mathematics – Logic
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufm.t21b1946d&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #T21B-1946
Mathematics
Logic
8123 Dynamics: Seismotectonics
Scientific paper
The nature and distribution of the seismicity and of the active structures in central Italy show that the active deformation field is mainly characterised by extension in the axial zone of the Apennines and by co-axial contraction on the frontal part of the belt. In this tectonic context become crucial, from the seismic hazard point of view, the seismotectonic characterization of the major earthquake localised between the two seismotectonic provinces. The 1706 (Io=IX-X), 1933 (Io=VIII-IX) and 1881 (Io=VIII) Maiella earthquakes stroke areas extending outward of the easternmost, NNW-SSE, active normal fault alignment and inward of the N-S oriented active thrust front. These earthquakes have been attributed by some authors to thrust faulting, while partly to upper crust normal faulting and partly to thrust faulting by others. Due to the poor local configuration of the national seismic network, the available seismic instrumental data are inadequate to constrain the active deformation pattern of the Maiella area. On the other hand, the shallow and deep tectonic setting is rather well known and macroseismic data of the afore-mentioned earthquakes available. The present study has been carried on mainly focusing on the 1706 event, following and integrating three methodological steps: a) selection and definition of the likely 3D seismogenic source models; b) evaluation of possible local effects on the macroseismic field data; d) estimation of seismic scenario in terms of macroseismic intensity, calculating synthetic strong motion time histories starting from different configuration and depths of the seismogenic source models, with a stochastic finite-fault modelling of the ground motion. The method involves discretization of fault plane into smaller sub- faults; the contribution from all the sub-faults is summed to produce the synthetic acceleration time history. For each point of the 1706 macroseismic field, peak ground acceleration and velocity were determined in order to evaluate the calculated intensities using empirical relationships. Results show that the seismic scenario closest to the 1706 observed intensity field may be reproduced starting from a source model associated to SW-dipping thrust faulting located at depths between 5 and 10 km.
Boncio Paolo
de Nardis Rita
Lavecchia Giusy
Pace B.
Visini Francesco
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