气候变化领域集成服务门户(CCPortal): Lithospheric Architecture of the Paranapanema Block and Adjacent Nuclei Using Multiple-Frequency P-Wave Seismic Tomography

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DOI	10.1029/2020JB021183
	Lithospheric Architecture of the Paranapanema Block and Adjacent Nuclei Using Multiple-Frequency P-Wave Seismic Tomography
	Affonso G.M.P.C.; Rocha M.P.; Costa I.S.L.; Assumpção M.; Fuck R.A.; Albuquerque D.F.; Portner D.E.; Rodríguez E.E.; Beck S.L.
发表日期	2021
ISSN	21699313
卷号	126 期号:4
英文摘要	We present a new P-wave seismic tomographic model for the region of the Paraná Basin and surroundings using a multiple-frequency approach, providing better resolution than previous regional studies. We processed a total of 62,692 cross-correlation delays for P, PKIKP, PcP, and PP phases distributed among 1,081 events using six different central frequencies (0.03, 0.06, 0.13, 0.25, 0.50, and 1 Hz). We merged our data with a previous multiple-frequency study of the Amazonian Craton to cover regions outside of the study area, obtaining a total of 75,187 cross-correlation delays. The data used are from the stations of the Brazilian Seismographic Network, and mainly from a temporary network (XC network) installed exclusively to study the region. The basement of the Paraná Basin is represented as a NE-SW trending P-wave high-velocity anomaly, extending from the northern limit of the basin to the southwestern border of Brazil, consistent with previous reports. The limit between this block and the São Francisco Craton is characterized by decreased amplitude of the P-wave high-velocity anomaly. Synthetic tests show that a narrow boundary between these two blocks displays the same behavior. At the southeastern portion of this anomaly, decreasing amplitude is consistent with the limit of the Luiz Alves Craton, which was also corroborated by synthetic tests. The northern portion of the Rio Apa Block agrees with a previous tomographic model, confirming that it does not extend under the Pantanal Basin, however, in our model this structure does not extend as far south. © 2021. The Authors.
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187211
作者单位	Institute of Geosciences, University of Brasília (UnB), Brasília, Brazil; CPRM - Geological Survey of Brazil, Brasília, Brazil; IAG - Department of Geophysics, University of São Paulo (USP), São Paulo, Brazil; Earth and Planets Laboratory, Carnegie Institution for Science, Washington, DC, United States; Department of Geosciences, University of Arizona, Tucson, AZ, United States
推荐引用方式 GB/T 7714	Affonso G.M.P.C.,Rocha M.P.,Costa I.S.L.,et al. Lithospheric Architecture of the Paranapanema Block and Adjacent Nuclei Using Multiple-Frequency P-Wave Seismic Tomography[J],2021,126(4).
APA	Affonso G.M.P.C..,Rocha M.P..,Costa I.S.L..,Assumpção M..,Fuck R.A..,...&Beck S.L..(2021).Lithospheric Architecture of the Paranapanema Block and Adjacent Nuclei Using Multiple-Frequency P-Wave Seismic Tomography.Journal of Geophysical Research: Solid Earth,126(4).
MLA	Affonso G.M.P.C.,et al."Lithospheric Architecture of the Paranapanema Block and Adjacent Nuclei Using Multiple-Frequency P-Wave Seismic Tomography".Journal of Geophysical Research: Solid Earth 126.4(2021).