NDLI: Attenuation of seismic coda waves in João Câmara (Rio Grande do Norte)

Content Provider	Springer Nature Link
Author	Carvalho, L. A. Souza, J. L.
Copyright Year	2006
Abstract	Seismic coda Q attenuation (Q $_{c}$) in the frequency range from 6 to 20 Hz of two distinct S coda windows (early and later portions) are compared to analyse the effects of both coda windows on crustal seismic attenuation estimates around Samambaia fault (João Câmara — Northeastern Brazil). Q $_{c}$ values associated with the later portion are systematically higher than those related to the early portion. These values follow a frequency (ƒ) function given by Q $_{c}$(ƒ) = Q $_{0}$ƒ$^{η}$, where Q $_{0}$ = 117 ± 39 and η = 1.00 ± 0.06. In general, Q $_{0}$ estimate is less sensitive to site effects and stabler than that obtained from the early portion of S coda waves, while its corresponding frequency dependence is similar to that obtained from the early portion of S coda waves. It suggests that η parameter does not depend on coda window’s location along the seismic signal. A comparative analysis of both Q $_{0}$ and η values with those found recently shows that there is no difference in using early or later portion of S coda waves in the stations located on Pre-Cambrian basement in the João Câmara area. This comparison also shows that the major variations in Q $_{0}$ values were observed at seismic stations installed on sedimentary terrain. Differences in the seismic attenuation, in both sides of the Samambaia fault, were also observed in this study, and it is in agreement with the hypothesis that Samambaia fault is a kind of boundary between two seismic attenuation zones.
Starting Page	133
Ending Page	142
Page Count	10
File Format	PDF
ISSN	12178977
Journal	Acta Geodaetica et Geophysica Hungarica
Volume Number	41
Issue Number	1
e-ISSN	15871037
Language	English
Publisher	Springer Netherlands
Publisher Date	2013-02-27
Publisher Institution	Quarterly of the Hungarian Academy of Sciences
Publisher Place	Dordrecht
Access Restriction	Subscribed
Subject Keyword	Q crustal attenuation Northeastern Brazil local earthquakes S coda waves Geophysics/Geodesy
Content Type	Text
Resource Type	Article
Subject	Building and Construction Geology Geophysics

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