Abstract
A re-estimate of coda Q (Qc) was carried out on short period vertical seismograms of earthquakes located on Etna volcano, Sicily. Care was taken in selecting coda duration intervals in which the estimates are made. A clear dependence of Qc on frequency and coda duration interval has been evidenced. Qc is proportional to fn with n equal to 1 for short coda duration intervals (25 s) and with n equal to or less than 0.8 for longer codas. A depth effect and/or the presence of multiple scattering can be the cause of the Qc dependence on coda duration.
Dependence of Qc on time was investigated in an 8-year time interval.
An increase of 1/Q seems to occur before the volcanic eruptions but we cannot place a statistical significance on the results.
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© 1992 Springer-Verlag Berlin Heidelberg
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Del Pezzo, E., Patané, D. (1992). Coda Q Dependence on Time, Frequency and Coda Duration Interval at Mt. Etna, Sicily. In: Gasparini, P., Scarpa, R., Aki, K. (eds) Volcanic Seismology. IAVCEI Proceedings in Volcanology, vol 3. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-77008-1_9
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DOI: https://doi.org/10.1007/978-3-642-77008-1_9
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