Attenuation of short-period seismic waves at MT Vesuvius, Italy

Details Attenuation of short-period seismic waves at MT Vesuvius, Italy Attenuation of short-period seismic waves at MT Vesuvius, Italy

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999geoji.138...67b&link_type=abstract

Geophysical Journal International, Volume 138, Issue 1, pp. 67-76.

Astronomy and Astrophysics

Astronomy

14

Mt Vesuvius, Scattering, Seismic Attenuation, Volcano Seismicity

Scientific paper

We analysed short-period seismograms from about 250 very local events recorded by a network of high dynamic range short-period seismic stations deployed on Mt Vesuvius to estimate the site-corrected short-period seismic attenuation. We calculated Q_C^- 1, the inverse of the quality factor for coda waves, for short lapse times (12 s), and Q_P^- 1 and Q_S^- 1, the inverse of the direct body wave quality factors for P and S waves follow- ing shallow ray paths. We used the single scattering assumption to fit the amplitude envelopes of the coda at different frequency bands, obtaining a Q_C^- 1 slowly varying with frequency, similar to values measured for other volcanoes at the same lapse time. Site-corrected Q_P^- 1 and Q_S^- 1 were estimated using the frequency decay method for both P and S waves in two frequency bands, 1-6 Hz and 15-24 Hz. Results show that Q_P^- 1 is 0.028 in both frequency bands, and Q_S^- 1 is 0.015 and 0.017 at low and high frequencies respectively, almost independent of the frequency, and that the value of Q_P^- 1 is about twice that of Q_S^- 1, as measured worldwide. A check was made by measuring the broadening of the first P-wave pulse with station-source distance, finding Q_P^- 1=0.024. Using the independent estimates of Q_C^- 1 and Q_S^- 1, we separated the intrinsic from the scattering quality factor at Mt Vesuvius, obtaining a high scattering and a low intrinsi c Q^- 1, as already observed for other volcanoes. This result confirms the hypothesis of the predominant role of the scattering phenomena with respect to the intrinsic dissipation in the seismogram formation for volcanic earthquakes.

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