HR: 0800h
AN: S51B-1010    [Abstracts]
TI: Three-dimensional Probabilistic Earthquake Location Applied to 2002-2003 Mt. Etna Eruption
AU: Mostaccio, A
EM: mostaccio@ct.ingv.it
AF: Istituto Nazionale di Geofisica e Vulcanologia, Piazza Roma, 2, Catania, CT 95123 Italy
AU: Tuve', T
EM: tuve@ct.ingv.it
AF: Istituto Nazionale di Geofisica e Vulcanologia, Piazza Roma, 2, Catania, CT 95123 Italy
AU: * Zuccarello, L
EM: zuccarello@ct.ingv.it
AF: Istituto Nazionale di Geofisica e Vulcanologia, Piazza Roma, 2, Catania, CT 95123 Italy
AU: Patane', D
EM: patane@ct.ingv.it
AF: Istituto Nazionale di Geofisica e Vulcanologia, Piazza Roma, 2, Catania, CT 95123 Italy
AU: Saccorotti, G
EM: gilberto@ov.ingv.it
AF: Istituto Nazionale di Geofisica e Vulcanologia - Osservatorio Vesuviano, Via Diocleziano, 328, Napoli, NA 80124 Italy
AU: D'Agostino, M
EM: dagostino@ct.ingv.it
AF: Istituto Nazionale di Geofisica e Vulcanologia, Piazza Roma, 2, Catania, CT 95123 Italy
AB: Recorded seismicity for the Mt. Etna volcano, occurred during the 2002-2003 eruption, has been relocated using a probabilistic, non-linear, earthquake location approach. We used the software package NonLinLoc (Lomax et al., 2000) adopting the 3D velocity model obtained by Cocina et al., 2005. We applied our data through different algorithms: (1) via a grid-search; (2) via a Metropolis-Gibbs; and (3) via an Oct-tree. The Oct-Tree algorithm gives efficient, faster and accurate mapping of the PDF (Probability Density Function) of the earthquake location problem. More than 300 seismic events were analyzed in order to compare non-linear location results with the ones obtained by using traditional, linearized earthquake location algorithm such as Hypoellipse, and a 3D linearized inversion (Thurber, 1983). Moreover, we compare 38 focal mechanisms, chosen following stricta criteria selection, with the ones obtained by the 3D and 1D results. Although the presented approach is more of a traditional relocation application, probabilistic earthquake location could be used in routinely survey.
DE: 7209 Earthquake dynamics (1242)
DE: 7280 Volcano seismology (8419)
SC: Seismology [S]
MN: Fall Meeting 2005