Attenuation of seismic coda waves in Joao Câmara (Rio Grande do Norte)

L A Carvalho; J L de Souza

doi:10.1556/ageod.41.2006.1.10

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Acta Geodaetica et Geophysica Hungarica

Volume/Issue:: Volume 41: Issue 1

Attenuation of seismic coda waves in Joao Câmara (Rio Grande do Norte)

Authors:

L A Carvalho

L A Carvalho MCT/Observatório Nacional R: Gal. José‚ Cristino 77, S?o Cristóv?o, 20921-400 Rio de Janeiro, Brazil

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J L de Souza

J L de Souza MCT/Observatório Nacional R: Gal. José‚ Cristino 77, S?o Cristóv?o, 20921-400 Rio de Janeiro, Brazil

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Pages:: 133–142

Online Publication Date:: 08 Mar 2006

Publication Date:: 01 Mar 2006

Article Category:: Journal Article

DOI:: https://doi.org/10.1556/ageod.41.2006.1.10

Keywords:: local earthquakes; crustal attenuation; Northeastern Brazil; Q; S coda waves

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Seismic coda Qattenuation (Q_c) in the frequency range from 6 to 20 Hz of two distinct Scoda 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_cvalues associated with the later portion are systematically higher than those related to the early portion. These values follow a frequency (f) function given by Q_c(f) = Q₀f^, where Q₀= 11739 and= 1.000.06. In general, Q₀estimate 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parameter does not depend on coda window's location along the seismic signal. A comparative analysis of both Q₀and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 Q₀values 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.

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Acta Geodaetica et Geophysica Hungarica

Print ISSN:: 1217-8977

Online ISSN:: 1587-1037

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Acta Geodaetica et Geophysica
Language	English
Size	B5
Year of Foundation	2013
Volumes per Year	1
Issues per Year	4
Founder	Magyar Tudományos Akadémia
Founder's Address	H-1051 Budapest, Hungary, Széchenyi István tér 9.
Publisher	Akadémiai Kiadó Springer Nature Switzerland AG
Publisher's Address	H-1117 Budapest, Hungary 1516 Budapest, PO Box 245. CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible Publisher	Chief Executive Officer, Akadémiai Kiadó
ISSN	2213-5812 (Print)
ISSN	2213-5820 (Online)

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