Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/6664
AuthorsTramelli, A.* 
Del Pezzo, E.* 
Galluzzo, D.* 
Fehler, M. C.* 
TitleAnomalous character of the coda envelopes onMt Vesuvius explained in terms of depth dependent Q
Issue Date2010
Series/Report no./181(2010)
DOI10.1111/j.1365-246X.2010.04543.x
URIhttp://hdl.handle.net/2122/6664
KeywordsCoda waves
Seismic attenuation
Site effects
Volcano seismology
Subject Classification04. Solid Earth::04.06. Seismology::04.06.09. Waves and wave analysis 
AbstractMany observations made on volcanic areas showed that a non-uniform distribution of coda wave energy is present between regions with differing geological structures. This observation was carried out in La Reunion and interpreted by Aki and Ferrazzini as due to a trapping process of the scattered waves in the volcanic cone, named by these authors as ‘coda localization’. The same properties were found in Mt Vesuvius examining codas from shots fired for active tomography. In this paper, we experimentally check whether the scattered wave field produced by local VT earthquakes is inhomogeneous as found for codas from shots in the same volcano. We examine the Log plot of S-wave direct amplitude normalized for the coda amplitude at a given lapse time (coda normalization) for all the recording stations and the site transfer functions calculated for the same stations using both the direct S-wave spectra and the coda wave spectra. Results show that the Log normalized amplitude increases with distance, the opposite of what commonly observed in non-volcanic zones. This effect may be caused by an effective inhomogeneity of the scattering wave field or, in different words, by a total-Q increasing with depth.
Appears in Collections:Papers Published / Papers in press

Files in This Item:
File Description SizeFormat 
2010 Tramelle et al _ Localization.pdf568.04 kBAdobe PDFView/Open
Show full item record

Page view(s)

72
Last Week
0
Last month
2
checked on Jul 26, 2017

Download(s)

31
checked on Jul 26, 2017

Google ScholarTM

Check

Altmetric