Highlights

QP and QS of Campi Flegrei from the inversion of rayleigh waves recorded during the SERAPIS project

Conception, verification and application of innovative techniques to study active volcanoes, Edited by Warner Marzocchi e Aldo Zollo,  ISBN 978-88-89972-09-0, 2008
S. de Lorenzo, A. Zollo, M. Trabace, M. Vassallo

Abstract 

Seismic shots recorded during the SERAPIS experiment were used to search a 1D elastic and inelastic model of the Gulf of Pozzuoli, south of the Campi Flegrei caldera. Waveforms were gaussian filtered in the range 5-8 Hz with a frequency step of 0.5 Hz and a half-width of the filter equal to 0.5 Hz. A clear dispersion of the most energetic propagation mode was revealed. This property
of the surface wave in the gulf of Pozzuoli was theoretically reproduced using the classical wave-number technique. To infer the best fit propagation model, we developed a semi-automated procedure of fitting of filtered traces with progressive adjustment of the model. The quality of the fitting was estimated using the semblance among each couple of waveform (synthetic and observed). Our formulation allowed us also to estimate the error on model parameter by mapping the noise on seismograms on the semblance.
The obtained 1D model confirms that in average intrinsic Qp at the Campi Flegrei caldera is of the order of 300-500 which is a background value higher than that of other volcanic areas.