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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 CâmaraNortheastern 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) = Q 0 f , where Q 0= 11739 and= 1.000.06. In general, Q 0estimate 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 thatparameter does not depend on coda window's location along the seismic signal. A comparative analysis of both Q 0andvalues 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 0values 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.
: 1 – 220 . Cáceres , M. E. S. ( 2007 ): Corticolous crustose and microfoliose lichens of northeastern Brazil . – Libri Botanici 22 : 1 – 168
, biochemistry and genetic polymorphism analysis for the diagnosis of lactose intolerance in a population from northeastern Brazil. Clinics (Sao Paulo), 2016, 71 (2), 82–89. 24
.S., Lawrence Edwards, R., Cheng, H., Cristall, P.S., Smart, T. L., Richards, D.A. and Shen, C.-C. 2004 Wet periods in northeastern Brazil over the past 210 k yr linked to distant climate anomalies. Nature 432:740-743. Wet periods in
.B. , A.F. Bernardino , T.O. Ferreira , N.W. Bolton , L.E.O. Gomes and G.N. Nobrega . 2018 . Shrimp ponds lead to massive loss of soil carbon and greenhouse gas emissions in northeastern Brazilian mangroves . Ecol. Evol. 8 : 5530 – 5540
), 1293 – 1294 . Lucena , RFP , Araújo , EL , Albuquerque , UP . Does the local availability of woody caatinga plants (Northeastern Brazil) explain their use value? . Economic Botany 2007 61 : 347
, R. A. , Azevedo , S. S. and Porto , W. J. ( 2020 ): Cross-sectional survey for toxoplasmosis in free-range chickens ( Gallus gallus domesticus ) from the Atlantic Forest area in Alagoas state, Northeastern Brazil . Braz. J. Vet. Parasitol
Moraes , G .M. , Ridpath , J .F. and Canal , C. W. ( 2018 ): HoBi-like is the most prevalent ruminant pestivirus in Northeastern Brazil . Transbound. Emerg. Dis. 65 , 113 – 120 . Silveira , S. , Cibulski , S. P. , Junqueira , D. M
melting model (Fig. 6C ). The same can also be said of Mexican xenoliths (Fig. 6D ). In northeastern Brazil, near the edge of the Amazonian Craton, tertiary alkalic (3–13 Ma) basalts and spinel lherzolite inclusions therein provide valuable
. , Araújo , N. D. and Agra , M. F . ( 2014 ): Characters of leaf epidermis in Solanum (clade Brevantherum) species from Atlantic forest of northeastern Brazil . –S. Afr. J
