Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/8638
Authors: De Lorenzo, S.* 
Del Pezzo, E.* 
Bianco, F.* 
Title: Qc, Qb, Qi and Qs attenuation parameters in the Umbria–Marche (Italy) region
Journal: Physics of the Earth and Planetary Interiors 
Series/Report no.: /218 (2013)
Publisher: Elsevier Science Limited
Issue Date: 2013
DOI: 10.1016/j.pepi.2013.03.002
Keywords: Coda wave attenuation
Shear wave attenuation
Intrinsic and scattering attenuation
Fluid pressurization
Coda normalization method
Subject Classification04. Solid Earth::04.06. Seismology::04.06.09. Waves and wave analysis 
Abstract: The attenuation of coda and S waves has been inferred for the Umbria–Marche region (central Italy) using seismic waveforms collected during the 1997 seismic crisis. The selected dataset is composed of 343 small magnitude (1.4 < ML < 4.2) earthquakes recorded at a temporary array composed of 23 seismic stations. The Sato (1977) method, based on the assumption of single isotropic scattering has been used to infer Qc, considering three different lapse times (20, 30 and 40 s). The coda normalization method (Aki, 1980) has been used to infer Qb. Both Qc and Qb show a clear frequency dependence with a different frequency dependent parameter. The frequency dependence of Qc is comparable with that previously found in the same area and around it. Using the method of Wennerberg (1993), intrinsic and scattering attenuation have been separated. Intrinsic attenuation is found to be close to coda attenuation and dominates over scattering dissipation. Coda Q increases with increasing lapse time but at a rate smaller than that observed in other areas of the Earth. Coda and intrinsic attenuation in the Umbria–Marche region are very high compared to other seismic active regions of the Earth. The retrieved high values of intrinsic attenuation may be explained in terms of the previously hypothesized fluid-pressurized regime of the crust in the central Apennines (Miller et al., 2004).
Appears in Collections:Article published / in press

Files in This Item:
File Description SizeFormat Existing users please Login
Phys Earth Planet In 2013 de Lorenzo218.pdfMain article + Figures1.35 MBAdobe PDF
Show full item record

WEB OF SCIENCETM
Citations 50

20
checked on Feb 10, 2021

Page view(s)

155
checked on Mar 27, 2024

Download(s)

21
checked on Mar 27, 2024

Google ScholarTM

Check

Altmetric