HR: 15:20h
AN: S22D-07 INVITED     [PDF]
TI: Bayesian Location of Seismic Sequences in 3D Media
AU: * De Natale, G
EM: pino@ov.ingv.it
AF: Osservatorio Vesuviano-INGV, Via Diocleziano, 328, Naples, 80124 Italy
AU: Presti, D
EM: d.presti@inwind.it
AF: Osservatorio Vesuviano-INGV, Via Diocleziano, 328, Naples, 80124 Italy
AU: Troise, C
EM: claudia@ov.ingv.it
AF: Osservatorio Vesuviano-INGV, Via Diocleziano, 328, Naples, 80124 Italy
AB: We have developed a method for the Bayesian location of seismic sequences in three dimensional heterogeneous velocity models. The method is based on a Bayesian algorithm for single earthquake location. Joint location of seismic sequences is performed by adding together the probability density functions for individual earthquake locations. One of the main features of the method is the possibility to accumulate travel times in the heterogeneous model, as a function of both the seismic stations and of the grid points simulating the seismogenic volume. The possibility to separate the travel time computation, performed just once, from the location process, is an attractive feature for implementing fast location procedures in 3D models, for instance for surveillance purposes. Probabilistic location of seismic sequences, visualised in terms of contours of earthquake density, moment and energy release etc., can be obtained to give much more seismotectonic insight than classical location algorithms displayed with dots on maps. The continuous character of the output quantities is particularly indicated for seismic network testing purposes. It is in fact possible to compute the response of the location procedure, given the seismic network geometry, to various input earthquake distributions. Some applications of the method are also shown in this work, both to the location of synthetic earthquakes end of real sequences, in volcanic and tectonic areas.
DE: 1734 Seismology
DE: 7215 Earthquake parameters
SC: Seismology [S]
MN: 2003 Fall Meeting