Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/5275
AuthorsGiampiccolo, E.* 
Tusa, G.* 
Langer, H.* 
Gresta, S.* 
TitleAttenuation in Southeastern Sicily (Italy) by applying different coda
Issue Date2002
Series/Report no./ 6 (2002)
URIhttp://hdl.handle.net/2122/5275
Keywordsattenuation
Southeastern sicily
Subject Classification04. Solid Earth::04.06. Seismology::04.06.03. Earthquake source and dynamics 
AbstractThe attenuation in Southeastern Sicily has been investigated using 40 aftershocks of the December 13 1990, earthquake. The quality factor of coda waves (Qc) was estimated in the frequency range 1.5–24 Hz, applying three different methods in time and frequency domains. On the whole, a clear dependence of Qc on frequency was observed, according to the general law Q = Q0(f/f0) n . The frequency dependence relationships obtained from the analysis of coda waves at three lapse time windows (10, 20 and 30 seconds) show that, for all methods, Q0 (Qc at 1 Hz) significantly increases with lapse time. In particular, Q0 is approximately 20 at short lapse time (10 s) and increases to about 70 at longer lapse time (30 s). This is attributed to the fact that larger lapse times involve deeper parts of the crust and upper lithosphere which may be characterized by larger quality factors. Moreover, the value of the exponent n decreases with increasing coda lengths from about 1.3 to 0.9, suggesting a decrease in heterogeneity of the medium with depth. Finally, Qc-values here found are of the same order as those reported from other tectonic regions like the Anatolian Highlands or Southern Spain, while significantly higher than in the neighboring volcanic area of Mt. Etna.
Appears in Collections:Papers Published / Papers in press

Files in This Item:
File Description SizeFormat 
J_Seismology.pdfmanuscript182 kBAdobe PDFView/Open
Show full item record

Page view(s)

81
Last Week
0
Last month
2
checked on Aug 19, 2017

Download(s)

23
checked on Aug 19, 2017

Google ScholarTM

Check