http://www.cnr.it/ontology/cnr/individuo/prodotto/ID34896
Crustal Q in Southern Italy determined from regional earthquakes (Articolo in rivista)
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- Crustal Q in Southern Italy determined from regional earthquakes (Articolo in rivista) (literal)
- Anno
- 2008-01-01T00:00:00+01:00 (literal)
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- Castro RR, Gallipoli MR, Mucciarelli M. (literal)
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- ISI Web of Science (WOS) (literal)
- Titolo
- Crustal Q in Southern Italy determined from regional earthquakes (literal)
- Abstract
- We estimated the quality factor Q of S waves traveling through the crust in the southern region of Italy. For that purpose 65 regional earthquakes with magnitudes ML 2.0-5.3 and hypocentral distance ranging between 7 and 375 km were analyzed. To estimate Q we first calculated a set of empirical functions that describe the S-wave spectral-amplitude decay with distance for 15 frequencies between 1 and 25 Hz. Within the distance range of the recordings, the average Q can be approximated as Q=25.7f(1.4). To separate the effect of upper and lower crust in the total Q, we used the first 50 km of the attenuation functions to estimate Q of the upper crust, and found that Q= 18.8 f(1.7). Then, using the 50-100 km segment of the attenuation functions we estimated that Q= 17.8(1.3) for the lower crust We also found that at high frequencies (f>10 Hz) the upper crust Q increases considerable relative to lower crust Q, being a factor of nine greater at 25 Hz. This higher attenuation in the lower crust may be the effect of deep structures as reported by Menardi-Noguera and Rea (2000) that were subjected to brittle-ductile deformation during past tectonic events (literal)
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