Welitom Rodrigues Borges

Universidade de Brasília

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Eduardo Xavier Seimetz

Universidade de Brasília

Marcelo Peres Rocha

Universidade de Brasília

Luciano Soares da Cunha

Universidade de Brasília

Jorge Luís Porsani

Sociedade Brasileira de Geofísica

Vagner Roberto Elis

Universidade de São Paulo

Francisco Yukio Hiodo

Universidade de São Paulo

Pedro Nogueira

University of Évora

Márcio Maciel Cavalcanti

Universidade de Brasília

Yawar Hussain

Sapienza University of Rome

Paulo Araújo de Azevedo

Universidade Federal do Oeste do Pará

Cooperative Institutions

Universidade de Brasília

Instituto de Geociencias

Sociedade Brasileira de Geofísica

Brazilian Institute of Geography and Statistics

Universidade de São Paulo

Instituto de Geofísica y Astronomía

Universidade Federal do Ceará

Hospital Universitário da Universidade de São Paulo

Federal Police of Brazil

Serviço Geológico do Brasil - CPRM

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Métodos geofísicos aplicados ao estudo do assoreamento da unidade hidrográfica do Torto, no Lago Paranoá, Brasília-DF

Proceedings of the 4 Simpósio Brasileiro de Geofísica (2016)

Kamylla de Lima Alves Aline Isabel de Pádua Marco Ianniruberto Welitom Rodrigues Borges

10.22564/7simbgf2016.101

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Investigações Geofísicas Na Borda Da Bacia Sedimentar De São Paulo

6th International Congress of the Brazilian Geophysical Society (2001)

Welitom Rodrigues Borges Jorge Luís Porsani

This paper shows partial results of geophysical investigations carried out in the border of São Paulo Sedimentary Basin, within the São Paulo University campus. The main objective of this research is characterizing the sediments and the top of basement rocks using the GPR - Ground Penetrating Radar and Resistivity Methods. The geophysical profiles were carried out along the same line in order to compare results obtained from these methodologies. One GPR profile (216m) was acquired employing 50MHz antennas and one resistivity profile with dipole length of 20m. Besides two verticals electrical soundings (VES) measurements were done on the same line. The analysis of GPR profile permitted to identify the bottom boundary the soil and one coarse sand layer. The result was supported by borehole information. The electrical profile identified one conductivity anomaly zone between 80 and 110m, related probably with a shear zone.

Ground-Penetrating Radar

Basement

10.3997/2214-4609-pdb.217.177

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Utilização de tomografia elétrica na identificação de tambores metálicos implantados na área do Sítio Controlado de Geofísica Rasa do IAG/USP

Proceedings of the 4 Simpósio Brasileiro de Geofísica (2004)

Elizete M. A. da Silva Vagner Roberto Elis Welitom Rodrigues Borges Jorge Luís Porsani Francisco Yukio Hiodo

10.22564/1simbgf2004.057

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The São Francisco Paleodunes Aquifer: Characterization, Hidrogeoclimatic Analysis, and Estimates of Groundwater Resources

Vagney Aparecido Augusto José Elói Guimarães Campos Welitom Rodrigues Borges

Download This Paper Open PDF in Browser Add Paper to My Library Share: Permalink Using these links will ensure access to this page indefinitely Copy URL Copy DOI

Groundwater resources

Characterization

10.2139/ssrn.4330176

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O Sítio Controlado De Geofísica Rasa Do Iag-Usp: Instalação E Resultados Preliminares

Jorge Luís Porsani Selma Isabel Rodrigues Welitom Rodrigues Borges Francisco Yukio Hiodo

Os problemas de investigação rasa podem ser complexos quanto à interpretação dos dados, devido às incertezas. Com o objetivo de minimizar as ambigüidades, foi instalado no campus da USP o primeiro Sítio Controlado de Geofísica Rasa do Brasil. Foram implementadas sete linhas contendo diferentes alvos instalados em diferentes profundidades. Vários materiais foram utilizados, tais como, caixas de areia e brita, vasos cerâmicos, tubulações de PVC e aço, tambores de PVC e aço, cabos elétricos e conduítes para passagem de fibra ótica, dentre outros. Os alvos foram enterrados visando simular estudos geológicos, geotécnicos, arqueológicos, ambientais e de planejamento urbano. Neste trabalho apresentamos alguns resultados preliminares obtidos com o GPR.

10.3997/2214-4609-pdb.216.i_sg_sbgf2004_gp_06

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Characterization of Sobradinho landslide in fluvial valley using MASW and ERT methods

REM - International Engineering Journal (2020)

Yawar Hussain Omar Hamza Martín Cárdenas‐Soto Welitom Rodrigues Borges Jie Dou

Landslides can substantially impact the fluvial systems, which is why the continuous mapping of their extent, evolution and stability assessment is crucial. However, in such environments, material identification (e.g. colluvium) and subsurface characterization by the methods used for geologic mapping and geotechnical investigation is often a challenging task. Thus, these classical invasive methods may benefit from geophysical techniques to enable and enhance our understanding of the subsurface in these areas. To examine such integrated approach, Multi-Channel Analysis of Surface Waves (MASW) combined with Electrical Resistivity Tomography (ERT) were applied on a geomorphologically active fluvial valley in Sobradinho (the Federal District of Brazil). The subsurface materials showed a specific range of resistivity values as dry soil, saprolite, and landslide slip surface. The 1D shear wave velocity (Vs) model showed an increasing trend of Vs with depth at a location away from the landslide mass, while the longitudinal profile (over the landslide) showed an anomalous change in Vs (~ 250 to 400 m/sec). Based on the existing information about the landslide, the ERT appeared to be an effective method over MASW. This study shows how the integration of geophysical data with the geological and geotechnical investigation helps to obtain a more realistic or unambiguous model of the subsurface.

Electrical Resistivity Tomography

Colluvium

Saprolite

Regolith

Geotechnical investigation

Cohesion (chemistry)

10.1590/0370-44672019730109

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Study of seasonal variation of the P-wave velocity and porosity estimation using seismic refraction

Marcelo Peres Rocha Welitom Rodrigues Borges Eduardo Xavier Seimetz Paulo Araújo de Azevedo Márcio Maciel Cavalcanti

PreviousNext No Access12th International Congress of the Brazilian Geophysical Society & EXPOGEF, Rio de Janeiro, Brazil, 15–18 August 2011Study of seasonal variation of the P-wave velocity and porosity estimation using seismic refractionAuthors: Marcelo Peres RochaWelitom Rodrigues BorgesEduardo Xavier SeimetzPaulo Araujo de AzevedoMarcio Maciel CavalcantiPedro Vencovsky NogueiraMarcelo Peres RochaProfessor of the Geosciences Institute of the UnB;, Welitom Rodrigues BorgesProfessor of the Geosciences Institute of the UnB;, Eduardo Xavier SeimetzMaster student of the Applied Geosciences Graduate Program of the IG/UnB;, Paulo Araujo de AzevedoMaster student of the Applied Geosciences Graduate Program of the IG/UnB;, Marcio Maciel CavalcantiMaster student of the Applied Geosciences Graduate Program of the IG/UnB;, and Pedro Vencovsky NogueiraUndergraduate student of the Geology of the IG/UnBhttps://doi.org/10.1190/sbgf2011-164 SectionsAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail Abstract This work shows results of seismic refraction in an area within the University of Brasilia, Campus Darcy Ribeiro, during dry and rainy seasons in the years 2010 and 2011. The main objective was to show the variability of seismic velocity with respect to seasonality, related with the water content in the ground. The results showed seasonal changes in the velocity of the first and second layer of the studied profile. With these results it was possible to estimate the porosity of the first layer. Keywords: interpretation, seismic, refraction, velocityPermalink: https://doi.org/10.1190/sbgf2011-164FiguresReferencesRelatedDetails 12th International Congress of the Brazilian Geophysical Society & EXPOGEF, Rio de Janeiro, Brazil, 15–18 August 2011ISSN (online):2159-6832Copyright: 2011 Pages: 2223 publication data© 2011 Published in electronic format with permission by the Brazilian Geophysical SocietyPublisher:Society of Exploration Geophysicists HistoryPublished Online: 13 Mar 2014 CITATION INFORMATION Marcelo Peres Rocha, Welitom Rodrigues Borges, Eduardo Xavier Seimetz, Paulo Araujo de Azevedo, Marcio Maciel Cavalcanti, and Pedro Vencovsky Nogueira, (2011), "Study of seasonal variation of the P-wave velocity and porosity estimation using seismic refraction," SEG Global Meeting Abstracts : 797-800. https://doi.org/10.1190/sbgf2011-164 Plain-Language Summary KeywordsinterpretationseismicrefractionvelocityPDF DownloadLoading ...

Variation (astronomy)

Seismic refraction

10.1190/sbgf2011-164

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Inversão conjunta de Ondas Rayleigh através da técnica MASW na avaliação de áreas susceptíveis a deslizamentos de terra

Geology Geophysics & Environment (2013)

Sergio Bezerra Lima Renato Luiz Prado Welitom Rodrigues Borges Jackson Alves Martins Raimundo Mariano Gomes Castelo Branco

Este artigo mostra a aplicacao do metodo MASW (multichannel analysis of surface waves), utilizando a inversao conjunta dos modos fundamental com o primeiro modo da curva de dispersao das ondas superficiais, com base em resultados de uma pesquisa na area de erosao e deslizamento de terra na cidade de Ubatuba, estado de Sao Paulo. Discutimos tambem aspectos relacionados a aquisicao, processamento e inversao dos dados. A abordagem de usar o modo fundamental e o primeiro modo trouxe uma maior estabilidade no processo de inversao, em comparacao com os resultados usando apenas o modo fundamental das ondas Rayleigh. Alem disso, o metodo foi menos sensivel as camadas mais superficiais (ate 10 metros) em comparacao com os metodos geofisicos de GPR e refracao. A inversao multimodal das ondas Rayleigh foi capaz de mapear as interfaces mais profundas onde as camadas tem distintas propriedades elasticas (isto e, ondas de velocidades de cisalhamento diferentes). Somente metodo MASW identificou a espessura de solo onde que em condicoes de saturacao mostraria uma maior suscetibilidade a deslizamento, tendo em vista a dependencia direta da onda secundaria em relacao a constante de cisalhamento do material.

Rayleigh Wave

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Utilização De Tomografia Elétrica Na Identificação De Tambores Metálicos Implantados Na Área Do Sítio Controlado De Geofísica Rasa Do Iag/Usp

Elizete M.A. da Silva Vagner Roberto Elis Welitom Rodrigues Borges Jorge Luís Porsani Francisco Yukio Hiodo

Este trabalho apresenta os resultados preliminares de um perfil de tomografia elétrica 2D sobre tambores metálicos enterrados na área do Sítio Controlado de Geofísica Rasa do IAG/USP. A aplicação desta metodologia tem como objetivo identificar o padrão das anomalias elétricas dos tambores metálicos utilizando-se o arranjo dipolodipolo com espaçamento entre os dipolos de 1 metro. Os resultados mostraram que os parâmetros de campo utilizados permitiram somente identificar a posição horizontal dos tambores. Os alvos apresentaram anomalias de alta resistividade e alto valor de cargabilidade, na forma esférica.

10.3997/2214-4609-pdb.216.i_sg_sbgf2004_el_13

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The forensic application of ground-penetrating radar, Tekoha Jevy indigenous village, Paraná, Brazil

Geological Society London Special Publications (2019)

Rafael Espíndola Canata Fábio A. S. Salvador Welitom Rodrigues Borges Francisco José Fonseca Ferreira Eduardo Xavier Seimetz

Abstract Any archaeological site, according to the Brazilian Federal Constitution, is a patrimony of the Union; consequently, when crimes against this cultural patrimony occur, it becomes the responsibility of the Federal Police of Brazil. In 2013, there was a complaint to the Brazilian Federal Public Prosecutor's Office about the depredation of an archaeological site and forced withdrawal of the indigenous people because of the construction of a multimodal port in the city of Guaíra, in the state of Paraná, in southern Brazil. Thus, the Technical–Scientific Sector of the Federal Police Department, in partnership with Brazilian universities, used standard geophysical methods such as ground-penetrating radar (GPR) to investigate and locate buried archaeological targets. This paper discusses the results of 2D and 3D investigations in the Tekoha Jevy indigenous village, located in Guaíra County. In the field, 32 parallel sections of GPR data were acquired using 250 and 700 MHz shielded antennas. The results showed several anomalies, two of which were subjected to field checks using excavations, which revealed several artefacts such as ceramic fragments associated with ancient indigenous occupations on the banks of the Paraná River.

Ground-Penetrating Radar

10.1144/sp492-2017-329

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