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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Microwave Tomography-Enhanced GPR in Forensic Surveys: The Case Study of a Tropical Environment

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing (2015)

Emerson Rodrigo Almeida Jorge Luís Porsani Ilaria Catapano Gianluca Gennarelli Francesco Soldovieri

Ground penetrating radar (GPR) is a geophysical tool currently adopted by police forces to locate buried objects and missing human bodies. However, a systematic assessment of its achievable imaging capabilities is still an open issue. In addition, sometimes, conventional data processing tools do not provide accurate and reliable information, thus leading to a misinterpretation of the location and geometry estimation of the target. In this framework, this paper deals with a case study referred to a tropical environment, and investigates the imaging capabilities offered by a linear microwave tomography approach. The results of three experiments, referred to the same organic target and carried out at different times by means of 270- and 900-MHz antennas, are presented. The comparison between the microwave tomographic approach and the widely used Kirchhoff migration suggests that the former procedure allows improved performances in locating both the target and the grave.

Ground-Penetrating Radar

Microwave Imaging

Tomographic reconstruction

10.1109/jstars.2015.2466556

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Citations (32)

Caracterização da geometria de depósitos sedimentares da formação Açu na borda Sudoeste da Bacia Pontiguar, NE do Brasil

Yoe Alain Reyes Pérez Francisco Pinheiro Lima‐Filho L.R.A.X. de Menezes Jorge Luís Porsani Ciro Jorge Appi

No presente trabalho foi analisado o potencial de uso de algumas tecnicas com o objetivo de identificar geometrias deposicionais e subsidiar os estudos de reconstrucao paleogeografica da borda sudoeste da Bacia Potiguar. Para tanto, foram identificadas duas areas e selecionados alguns afloramentos para estudos integrados de geologia e geofisica. As principais tecnicas utilizadas foram: analises de facies, sensoriamento remoto, perfis geofisicos com GPR e levantamentos de perfis de raios gama em afloramentos. Esta abordagem metodologica se mostrou eficiente no que tange ao uso do metodo de analise de facies para identificacao de geometrias 2D. Os perfis de raios gama tambem apresentaram uma boa resposta, justificando seu uso na identificacao de geometria 1D e 2D. Entretanto, o GPR nao mostrou suficiente contraste para a identificacao de refletores de interesse geologico nos afloramentos Apodi e Olho d’ Agua da Bica.

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Characterization GPR and ER of Asphaltic Sandstones of the Paraná Basin, Brazil: Preliminary Results

Proceedings (2014)

Luciana Bertolla Jorge Luís Porsani C.F. Camargo Vagner Roberto Elis

Summary This paper shows the preliminary results of GPR and ER profiles on asphaltic sandstones. The study area is located in the municipality of Anhembi, situated on the eastern border of the Paraná basin, central-eastern region of the São Paulo state, Brazil. The region has been the subject of studies by Petrobras (Brazilian Oil Exploration Company) due to the presence of cumulative bitumen in sandstones. The results of ER show zones of high conductivity that match with the absences of reflections in GPR profiles. Although preliminary, the results suggest the presence of bacterial action, featuring a biodegradation problem. Despite this, detailed studies are in progress to test the biodegradation hypothesis.

Ground-Penetrating Radar

Outcrop

10.3997/2214-4609.20142069

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Inversăo conjunta SEV/TDEM aplicada em estudos hidrogeológicos na regiăo de Urupęs-SP, bacia do Paraná: Resultados preliminares

Proceedings of the 5 Simpósio Brasileiro de Geofísica (2012)

David Nakamura Leite Jorge Luís Porsani

No Estado de Sao Paulo, 462 municipios sao abastecidos por aguas subterrâneas, abrangendo uma populacao de 5,5 milhoes de pessoas que dependem de alguma forma desse recurso (Iritani & Ezaki, 2009). Nesse contexto, insere-se a regiao de Urupes que esta localizada na porcao noroeste do Estado de Sao Paulo, a aproximadamente 450 km da capital (Figura 1). Nos ultimos anos, o municipio de Urupes esta tendo problemas com a falta de abastecimento de agua no periodo do verao. O aumento do consumo e a diminuicao de recarga de agua sao os principais agravantes. Uma rapida solucao e a locacao de novos pocos de exploracao de agua subterrânea para equilibrar o abastecimento local. Para isso, a geofisica atraves dos metodos eletricos e eletromagneticos pode oferecer, de maneira efetiva, os locais mais favoraveis para a perfuracao de novos pocos. O uso integrado de metodos distintos e o tratamento dos dados por meio da inversao conjunta de diferentes metodos permitem reduzir a ambiguidade no processo interpretativo. A inversao conjunta de dados eletricos (SEV) e eletromagneticos no dominio do tempo (TDEM) ressalta as vantagens de cada metodo. As SEV’s definem melhor as camadas resistivas, ao passo que, as sondagens TDEM definem melhor as camadas condutivas (Schmutz et al., 2000). Assim, as ambiguidades presentes nos dados sao reduzidas e a interpretacao torna-se mais confiavel.

10.3997/2214-4609-pdb.341.100

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The Effects of Negative Values of Apparent Resistivity in TEM Surveys

International Journal of Geosciences (2016)

Cassiano Antônio Bortolozo Julian David Realpe Campaña Marco Antônio Couto Jorge Luís Porsani Fernando A. Monteiro Santos

The calculation of apparent resistivity in electrical methods is relatively simple and consolidated in the literature. Furthermore, in the case of DC methods, the apparent resistivity values are for the most part, intuitive and enable an initial interpretation of the results. On the other hand, in TEM method the apparent resistivity values are not very intuitive and interpretation based only on the apparent resistivity values cannot be done reasonably. In this way, this paper presents a discussion about the reasons and effects of the negatives values of apparent resistivity in TEM soundings. The main objective of this paper is to clarify the meanings of these negatives values and the possible effects in TEM inversion.

10.4236/ijg.2016.710088

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Citations (7)

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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Geoelectrical characterization with 1D VES/TDEM joint inversion in Urupês-SP region, Paraná Basin: Applications to hydrogeology

Journal of Applied Geophysics (2018)

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

Vertical electrical sounding

10.1016/j.jappgeo.2018.02.022

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Citations (13)

Aplicação de ensaios elétricos e eletromagnéticos em problema de poluição ambiental

Brazilian Journal of Geophysics (2002)

Jorge Eduardo da Silva Elaine Maria Loureiro Vagner Roberto Elis Francisco Yukio Hiodo Jorge Luís Porsani

Este trabalho visa o estudo de contaminação causada por um lixão, através dos métodos geofísicos da resistividade, eletromagnético indutivo. Os trabalhos foram realizados em Ribeirão Preto, São Paulo, Brasil, em um lixão desativado. Os dados obtidos foram tratados com softwares apropriados que possibilitaram o realce das anomalias, as quais auxiliaram na caracterização do problema ambiental causado.

10.1590/s0102-261x2002000300006

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Citations (5)

Evaluation methodology for obtaining geotechnical parameters using electrical resistivity

First Break (2018)

L. Lavalle Cassiano Antônio Bortolozo Téhrrie Caroline König Ferraz Pacheco Márcio Roberto Magalhães de Andrade Mariana Ferreira Benessiuti Motta

For any type of construction it is necessary to accurately determine the parameters of characterization, permeability and resistance-deformation of the soil. That analysis is carried out with laboratory tests on samples extracted during the geotechnical field investigation. The advantage of this method is the direct measurement of more important properties controlling the environment and contour conditions. Although the process of extracting the samples tries not to modify the initial conditions of the soil, the intervention of the test generates changes in the initial structure, thus the results cannot fully represent the real conditions in the field. (Liu, 2008)

Soil test

Igneous petrology

10.3997/1365-2397.n0112

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Citations (7)