HR: 10:50h
AN: S52A-03    [Abstracts]
TI: Recent Seismic Activity of the Messina Straits Area, Italy, and the Magnitude 7, 1908 Messina Earthquake
AU: * Amoruso, A
EM: antonella.amoruso@aquila.infn.it
AF: Dipartimento di Fisica, Universit\`a dell'Aquila, via Vetoio 10, L'Aquila, 67010 Italy
AU: Crescentini, L
EM: luca.crescentini@unicam.it
AF: Dipartimento di Scienze della Terra, Universit\`a di Camerino, via Gentile III da Varano, Camerino (MC), 62032 Italy
AU: Neri, G
EM: geoforum@unime.it
AF: Dipartimento di Scienze della Terra, Universit\`a di Messina, Salita Sperone 31, Messina, 98166 Italy
AU: Orecchio, B
EM: orecchio@unime.it
AF: Dipartimento di Scienze della Terra, Universit\`a di Messina, Salita Sperone 31, Messina, 98166 Italy
AU: Scarpa, R
EM: roberto.scarpa@sa.infn.it
AF: Dipartimento di Fisica, Universit\`a di Salerno, Via S. Allende, Baronissi (SA), 84081 Italy
AB: The 1908 Messina earthquake is one of the strongest historical seismic events that ever occurred in Italy, with more than 60,000 casualties and extensive damage. Precision double-run levelings were carried out a few years before the 1908 earthquake, and some lines were resurveyed just after the seismic event. Such data were used to model the source fault (Amoruso et al. 2002). Recent seismicity level in the Messina Straits was low, and only one earthquake exceeded magnitude 5.0 (M=5.6, 1978). Earthquakes occurred between January 1978 and March 2001 at crustal depth in the Messina Straits area were located using an up-to-date 3D velocity model (Barberi et al. 2004). Best-quality earthquake fault-plane solutions were used to obtain stress tensor. Fault plane was identified for the majority of the events (Neri et al. 2004). A preliminary comparison among the results of the above-mentioned studies has proved encouraging (Amoruso et al. 2004). This presentation deals with further improvements and final results. We have re-analyzed coseismic geodetic data of the 1908 Messina earthquake and tested robustness of retrieved fault parameters and slip distribution, by taking into account the effects of crustal layering and combining random measurement errors and uncorrelated uplift residuals. The data set of recent seismicity has been extended to 2004, and a more detailed 3D velocity model with an inversion grid spacing of 10 km has been obtained. We have checked for possible correlation between the 1908 earthquake slip distribution and the spatial distribution of recent earthquakes located in the fault volume and the related seismic strain. Results have been compared with the geology and the geomorphology of the Messina Straits area.
DE: 7230 Seismicity and seismotectonics
DE: 7215 Earthquake parameters
SC: Seismology [S]
MN: 2004 AGU Fall Meeting