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Source Parameters of Microearthquakes in Southeastern Sicily, Italy

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 (Q_p) 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 Q_p 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.

This article has been cited by other articles:

				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 Bulletin of the Seismological Society of America, June 1, 2009; 99(3): 1921 - 1936. [Abstract] [Full Text] [PDF]

				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. [Abstract] [Full Text] [PDF]

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