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Bulletin of the Seismological Society of America; June 2006; v. 96; no. 3; p. 968-983; DOI: 10.1785/0120050071
© 2006 Seismological Society of America
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Source Parameters of Microearthquakes in Southeastern Sicily, Italy

Giuseppina Tusa1, Alfonso Brancato2 and Stefano Gresta1

1 Dipartimento di Scienze Geologiche
Università di Catania
Corso Italia 57
95129 Catania, Italy
gtusa{at}unict.it
gresta{at}unict.it
 (G.T., S.G.)
2 Dipartimento di Scienze della Terra
Università di Napoli
Largo San Marcellino 10
80138 Napoli, Italy
abranca{at}unict.it
 (A.B.)

We computed the source parameters of 135 local earthquakes that occurred in southeastern Sicily (Italy) between 1994 and 2001. Magnitudes ranged from 0.6 to 2.5. The source parameters were determined from the spectral analysis of P waves, after corrections for attenuation and site effects. P-wave quality (Qp) and site (S) factors are known in the two frequency ranges 3–9 Hz and 16–27 Hz (Giampiccolo et al., 2003). Because the correction for Qp and S over the whole spectrum could not be performed, a new approach to estimate spectral parameters was applied. We defined the new notion of "holed spectrum" to specify a spectrum lacking corrected spectral amplitude values within a certain frequency range, whereas we referred to a "whole spectrum" to specify when the entire analyzed frequency band was used. A detailed statistical analysis showed that dealing with the holed spectrum did not lead to significant differences in the estimate of spectral parameters. Displacement holed spectra, corrected by the attenuation and site response, were then used to estimate source parameters. Seismic moments ranged from 1017 to 1020 dyne cm, and source dimensions from 150 to 500 m. In general, the stress-drop values obtained analyzing P-wave spectra were very low, because they mainly span the range of 0.05–5 bars.




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A. Brancato, J. A. Hole, S. Gresta, and J. N. Beale
Determination of Seismogenic Structures in Southeastern Sicily (Italy) by High-Precision Relative Relocation of Microearthquakes
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 Bulletin of the Seismological Society of AmericaHome page
G. Tusa and S. Gresta
Frequency-Dependent Attenuation of P Waves and Estimation of Earthquake Source Parameters in Southeastern Sicily, Italy
Bulletin of the Seismological Society of America, December 1, 2008; 98(6): 2772 - 2794.
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E. Giampiccolo, S. D'Amico, D. Patane, and S. Gresta
Attenuation and Source Parameters of Shallow Microearthquakes at Mt. Etna Volcano, Italy
Bulletin of the Seismological Society of America, February 1, 2007; 97(1B): 184 - 197.
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