ISSN:
1420-9136
Keywords:
Q
;
code waves
;
volcanic earthquakes
Source:
Springer Online Journal Archives 1860-2000
Topics:
Geosciences
,
Physics
Notes:
Abstract Digital recordings of three component microearthquake codas from shallow seismic events in the volcanic region of Campi Flegrei — Southern Italy — were used with an automatic technique to calculate the attenuation factorQ c (codaQ) in the hypothesis of singleS toS backscattering. Results show the same value ofQ for each of the three components. This result is interpreted as due to isotropicS wave radiation pattern. A check of the coda method was performed using a single station method based on simple assumptions on the direct SH wave spectrum. Single stationQ was averaged over the stations and over the earthquakes. Results show that the two methods lead to comparable results. A frequency dependence quite different from that evaluated in active tectonic regions was found for coda attenuation, comparable to other volcanic areas throughout the world. This is interpreted as due to the presence of magma that affects anelasticity and scattering.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00878402
