Jorge Luís Porsani

Sociedade Brasileira de Geofísica

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Cassiano Antônio Bortolozo

Centro Nacional de Monitoramento e Alertas de Desastres Naturais

Francisco Yukio Hiodo

Universidade de São Paulo

Vagner Roberto Elis

Universidade de São Paulo

Welitom Rodrigues Borges

Universidade de Brasília

Fernando A. Monteiro Santos

University of Lisbon

Vinícius Rafael Neris dos Santos

Forest Science and Research Institute

Emerson Rodrigo Almeida

Universidade Federal de Uberlândia

Marco Antônio Couto

Serviço Geológico do Brasil - CPRM

Selma Isabel Rodrigues

Universidade de São Paulo

Julian David Realpe Campaña

Departamento de Ciência e Tecnologia

Cooperative Institutions

Universidade de São Paulo

Instituto de Geofísica y Astronomía

Sociedade Brasileira de Geofísica

Hospital Universitário da Universidade de São Paulo

Universidade Estadual Paulista (Unesp)

Centro Nacional de Monitoramento e Alertas de Desastres Naturais

Instituto de Geociencias

Brazilian Institute of Geography and Statistics

Terra

Universidade Federal de Minas Gerais

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Estudos Geoelétricos Com o Método TDEM por Meio da Técnica de Tx-Fixo e Rx-Móvel Aplicados à Exploração de Àgua Subterrânea na Bacia do Paraná

Proceedings of the 4 Simpósio Brasileiro de Geofísica (2016)

Gabriela Serejo Jorge Luís Porsani Julian David Realpe Campaña Cassiano Bortolozzo

In this research we used the electromagnetic methods in the time domain (TDEM) and resistivity aimed at mapping of sedimentary and crystalline aquifers in the sedimentary basin.Data were acquired through fixed transmitter loop technique and a 3D-mobile coil receiver, also known as fixed-loop technique and vertical electrical sounding (VES).The data of the component-Bz of the magnetic field was inverted individually and then laterally interpolated to obtain a pseudo 2-D profile.The results permit to map of the shallow sedimentary aquifer (Fm.Adamantina) and the Cristalline aquifer (Fm.Serra Geral).

10.22564/7simbgf2016.020

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Reduction of Topography Effect in Apparent Conductivity Profiles (EM38): Application on Sambaqui Site (Shell Mound) in Santa Catarina State, Brazil

Symposium on the Application of Geophysics to Engineering and Environmental Problems 2000 (2008)

Vinícius Rafael Neris dos Santos Selma Isabel Rodrigues Jorge Luís Porsani Carlos Alberto Mendonça

Modern land developments have motivated the application of geophysical methods in archaeological investigation in order to recognize hidden patterns in poorly known areas and select suitable places for excavation. Due to quick data acquisition and interpretation, low‐induction EM38 measurements (conductivity and magnetic susceptibility) have been successfully applied to map fire places, burials, and concentration of ceramic materials in many Brazilian prehistoric sites. Conductivity anomalies, however, are much affected by the soil water content, which in sites with rugged topography creates a site‐scale effect that masks the expression of subtle archaeological features. Here, we apply a procedure to remove the dependence of the soil conductivity with respect to the site topography by using a linear relationship determined by cross‐plotting conductivity and elevation values measured in a given site. Corrected conductivity values helped us to identify regions of archaeological interest (further confirmed by excavation), which formerly were not easily recognized from crude data. This procedure has shown proved utility as an exploration tool to study sambaqui (shell mounds) archaeological sites, at the sandy coastal plain of the Santa Catarina State, in southern Brazil.

10.4133/1.2963331

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Geoelectrical Studies by VES/TDEM Joint Inversion in the Parana Sedimentary Basin, Brazil

Proceedings (2014)

Jorge Luís Porsani David Nakamura Leite Cassiano Antônio Bortolozo Marco Antônio Couto Julian David Realpe Campaña

Summary In this work the authors shows results of VES/TDEM joint inversion for Urupês region, located in Paraná basin, São Paulo State, Brazil. The objectives were to map the sedimentary and crystalline aquifers. The sedimentary aquifer is characterized by Adamantina Formation (Bauru aquifer) and the crystalline aquifer is characterized by fractures zones in the basalt layers of the Serra Geral Formation. The joint inversion results are promising and they permit to map the tick of the Adamantina Formation, as well as locate a fracture zones inside of the basalt layer of the Serra Geral Formation.

10.3997/2214-4609.20142017

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Aplicação de tomografia elétrica na detecção de tambores plásticos na área do Sítio Controlado de Geofísica Rasa do IAG/USP

6th International Congress of the Brazilian Geophysical Society (2005)

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

O resumo mostra resultados de tomografia elétrica 2D realizada sobre tambores plásticos enterrados na área do Sítio Controlado de Geofísica Rasa do IAG/USP. A metodologia aplicada teve como objetivo identificar o padrão das anomalias elétricas dos tambores plásticos utilizando o arranjo dipolo-dipolo 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 baixo valor de cargabilidade.

10.3997/2214-4609-pdb.160.sbgf205

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Upper Pleistocene to Holocene peatland evolution in Southern Brazilian highlands as depicted by radar stratigraphy, sedimentology and palynology

Quaternary Research (2012)

Marcelo Accioly Teixeira de Oliveira Jorge Luís Porsani Gisele Leite de Lima Vivian Jeske-Pieruschka Hermann Behling

Paleoenvironmental interpretation of proxy data derived from peatlands is largely based upon an evolutionary model for ombrotrophic bogs, in which peat accumulates in still environments. Reports on proxies obtained from minerotrophic fens, where hydrologic inputs are variable, are less common. In this study, a highland peatland in southern Brazil is presented through ground penetrating radar (GPR) and sedimentological, palynological and geochronologic data. The radar stratigraphic interpretation suggests a relatively complex history of erosion and deposition at the site since the beginning of Marine Isotope Stage 3 (MIS 3) interstadial period. In spite of this, radar stratigraphic and palynologic interpretations converge. Electromagnetic reflections tend to group in clusters that show lateral coherence and correlate with different sediment types, while pollen grains abound and are well preserved. As a result, the study of minerotrophic fens provides a source of proxies, suggesting that ombrotrophic bogs are not the only reliable source of data in wetlands for palynological analysis.

Ombrotrophic

10.1016/j.yqres.2011.12.006

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1D Joint Inversion of DC and TEM Data for Hydrogeological Applications - Preliminary Results

Proceedings (2011)

Cassiano Antônio Bortolozo Jorge Luís Porsani Emerson Rodrigo Almeida Fernando A. Monteiro Santos

Electrical (DC) and transient electromagnetic (TEM) soundings have been used in great number of hydrological,environmental, and mining exploration studies. The data interpretation usually is done individually by 1D models resulting in ambiguous results. This fact can be explained by how the two different methodologies observe the medium below the surface. The vertical electrical sounding (VES) is good at marking very resistive structures, while the transient electromagnetic sounding (TEM) is very sensitive to map conductive structures. Another difference is that VES is better to detects shallow structures, while TEM soundings can reach deeper layers. In this way, a Matlab program for joint inversion of VES and TEM soundings was developed aiming explore the best of the both methods. Initially, the algorithm was tested with synthetic data and after was used real data from Paraná Sedimentary Basin in Bebedouro region, São Paulo State, Brazil. The geoelectrical model obtained from joint inversion of VES and TEM data are more similar to the real geological condition and ambiguities were minimized. The results with synthetic and real data shows that joint inversion of VES/TEM is better for recovering the simulated models and shows a great potential in geological studies, particularly in hydrogeological studies.

Vertical electrical sounding

Resistive touchscreen

Induced polarization

10.3997/2214-4609.20144448

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Inversão conjunta 1D e 2D de dados de eletrorresistividade e TDEM aplicados em estudos de hidrogeologia na bacia do Paraná

Cassiano Antônio Bortolozo Jorge Luís Porsani

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DC Resistivity Inversion Using Conjugate Gradient and Maximum Likelihood Techniques with Hydrogeological Applications

First Break (2024)

Cassiano Antônio Bortolozo Jorge Luís Porsani Fernando A. Monteiro Santos Tristan Pryer

This study introduces a DC 2D inversion algorithm that employs conjugate gradients relaxation to solve the maximum likelihood inverse equations. The adoption of the maximum likelihood algorithm was motivated by its advantage of not requiring the calculation of electrical field derivatives. While the inversion algorithm based on the maximum likelihood inverse theory has been extensively described for 3D DC inversion using finite differences modelling, its application in the 2D finite element method has received limited attention. A significant difference between 3D finite difference modelling and 2D finite element methods lies in the integration variable lambda. In our 2D case, the electrical potential is initially calculated in the Laplace and Fourier domains, which include the stiffness matrix. However, to obtain the stiffness matrix in the Cartesian domain, we had to develop a suitable transformation method since no existing resources in the literature addressed this specific condition. In this study, we successfully transformed the stiffness matrix using a similar approach to the potential calculation. The results obtained from synthetic and real models demonstrate the method's potential for various applications, as exemplified by the hydrogeological study presented in this work.

Igneous petrology

Economic geology

Environmental geology

Conjugate

10.3997/1365-2397.fb2024011

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Aplicação de tomografia elétrica na detecção de tambores plásticos na área do Sítio Controlado de Geofísica Rasa do IAG/USP

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

PreviousNext No Access9th International Congress of the Brazilian Geophysical Society & EXPOGEF, Salvador, Bahia, Brazil, 11-14 September 2005Aplicação de tomografia elétrica na detecção de tambores plásticos na área do Sítio Controlado de Geofísica Rasa do IAG/USPAuthors: Elizete M. A. da SilvaWelitom Rodrigues BorgesVagner Roberto ElisJorge L. PorsaniFrancisco Y. HiodoElizete M. A. da SilvaPós-Graduação em Geofísica do Instituto de Astronomia, Geofísica e Ciências Atmosféricas (IAG/USP);, Welitom Rodrigues BorgesPós-Graduação em Geofísica do Instituto de Astronomia, Geofísica e Ciências Atmosféricas (IAG/USP);, Vagner Roberto ElisDepartamento de Geofísica do Instituto de Astronomia, Geofísica e Ciências Atmosféricas (IAG/USP), Jorge L. PorsaniDepartamento de Geofísica do Instituto de Astronomia, Geofísica e Ciências Atmosféricas (IAG/USP), and Francisco Y. HiodoDepartamento de Geofísica do Instituto de Astronomia, Geofísica e Ciências Atmosféricas (IAG/USP)https://doi.org/10.1190/sbgf2005-045 SectionsAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail Abstract This paper is in Portuguese. O resumo mostra resultados de tomografia elétrica 2D realizada sobre tambores plásticos enterrados na área do Sítio Controlado de Geofísica Rasa do IAG/USP. A metodologia aplicada teve como objetivo identificar o padrão das anomalias elétricas dos tambores plásticos utilizando o arranjo dipolo-dipolo 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 baixo valor de cargabilidade. Keywords: electrical/resistivity, tomographyPermalink: https://doi.org/10.1190/sbgf2005-045FiguresReferencesRelatedDetails 9th International Congress of the Brazilian Geophysical Society & EXPOGEF, Salvador, Bahia, Brazil, 11-14 September 2005ISSN (online):2159-6832Copyright: 2005 Pages: 2274 publication data© 2005 Published in electronic format with permission by the Brazilian Geophysical SocietyPublisher:Society of Exploration Geophysicists HistoryPublished: 14 Sep 2005 CITATION INFORMATION Elizete M. A. da Silva, Welitom Rodrigues Borges, Vagner Roberto Elis, Jorge L. Porsani, and Francisco Y. Hiodo, (2005), "Aplicação de tomografia elétrica na detecção de tambores plásticos na área do Sítio Controlado de Geofísica Rasa do IAG/USP," SEG Global Meeting Abstracts : 213-216. https://doi.org/10.1190/sbgf2005-045 Plain-Language Summary Keywordselectrical/resistivitytomographyPDF DownloadLoading ...

10.1190/sbgf2005-045

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Geoelectrical characterization by joint inversion of VES/TEM in Paraná basin, Brazil

AGU Fall Meeting Abstracts (2012)

Cassiano Antônio Bortolozo Marco Antônio Couto Emerson Rodrigo Almeida Jorge Luís Porsani F. M. Santos

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