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

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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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O método magnetolúrgico aplicado à Bacia do São Francisco, Minas Gerais

Brazilian Journal of Geophysics (2001)

Jorge Luís Porsani Sérgio L. Fontes

Foram realizadas 43 sondagens magnetotelúricas, totalizando oito seções, na parte central da bacia sedimentar do São Francisco, região Norte do estado de Minas Gerais. Este estudo visou mapear a estrutura geoelétrica da bacia. O levantamento foi superposto a 10 linhas sísmicas, cobrindo 11.000 km² de área. O espaçamento entre as sondagens foi irregular e a freqüência utilizada variou de 0,001 até 400 Hz, permitindo investigar até 60 km de profundidade. Os dados foram corrigidos do efeito de deslocamento estático através da mediana da resistividade do primeiro condutor. Utilizou-se um invariante do tensor impedância para interpretar a estrutura geoelétrica da bacia. Apresenta-se neste trabalho o resultado de uma seção geoelétrica obtida através de inversão 1D. Foi identificada uma seqüência de horizontes condutivos e resistivos, correspondentes ao pacote sedimentar e o topo do embasamento geoelétrico, que caracterizam a bacia do São Francisco. Além disso, identificou-se uma zona condutiva e outra resistiva a profundidades crustais. Os resultados apresentaram uma boa concordância com os dados sísmicos e gravimétricos, enquanto a concordância com o perfil de eletrorresistividade do poço existente na área de investigação foi apenas razoável.

10.1590/s0102-261x2001000200003

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Magnetotelluric Investigations in the Săo Francisco Basin, Minas Gerais, Brazil

3rd International Congress of the Brazilian Geophysical Society (1993)

Jorge Luís Porsani Sérgio L. Fontes

A geoelectric image of a portion of the Sao Fransisco sedimentary basin (Minas Gerais) was obtained based on magnetotelluric (MT) data from 43 MT soundings (400 Hz - 0.001 Hz). The soundings were carried out along 10 seismic lines. covering an area of 11.000 km˛ approximately. The distances between soundings were irregular and varied from 2.5 km to 20 km. Static shift corrections were applied to the data using the median resistivity of the first conductor. One dimensional (1D) Occam geoelectrical sections were obtained for all profiles. A sequence of conductors and resistors was found in the sedimentary package. followed by a geoelectrical basement. The MT sections show good agreement with both borehole information and seismic sections.

Magnetotellurics

Basement

10.3997/2214-4609-pdb.324.1385

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Sistema de prospecção geofísica pelo método Eletromagnético Indutivo (EM) com aplicações no Sítio Controlado do IAG/USP

Hugo F. Saar Francisco Yukio Hiodo Nilton Silva K. Blaine Edgar D. Bronizeski

PreviousNext No Access9th International Congress of the Brazilian Geophysical Society & EXPOGEF, Salvador, Bahia, Brazil, 11-14 September 2005Sistema de prospecção geofísica pelo método Eletromagnético Indutivo (EM) com aplicações no Sítio Controlado do IAG/USPAuthors: Hugo F. Saar*Francisco Y. HiodoNilton SilvaKleiton BlaineEdgar BronizeskiAndré RugenskiJorge L. PorsaniWelitom R. BorgesHugo F. Saar*IAG-USP, Francisco Y. HiodoIAG-USP, Nilton SilvaIAG-USP, Kleiton BlaineIAG-USP, Edgar BronizeskiIAG-USP, André RugenskiIAG-USP, Jorge L. PorsaniIAG-USP, and Welitom R. BorgesIAG-USPhttps://doi.org/10.1190/sbgf2005-050 SectionsAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InReddit Abstract This paper is in Portuguese. An electromagnetic equipment operating in frequency domain was developed to prospect shallow conductive targets, as found in hydrogeological and archaeological surveys. Using low magnetic induction number concepts and lock-in circuits, it became possible to characterize conductors and ferromagnetics materials buried in subsurface, using the dipole electromagnetic profiling method. To achieve this end, in phase and quadracture signals due secondary magnetic fields detected by receiver coil allowed to recognize many kinds of buried conductors like pipes, metal drums. System consisting by two horizontal air cored coils (transmitter & receiver) fixed in both edges of a PVC tube, and intercoils spacing is 4 meters Operating frequency is around 10kHz and primary magnetic field is generated by a PWM power source associated with a serie LC ressonant circuit. The effective depth of investigation is about 5 meters. A rotatory mechanism allows measurements in HCP and VCP coils configurations. One great advantage of this detector using induction balancing is that surveys can be carried out in regions with high surface electrical resistivity such as asphalt and sand. Measurements realized on Sítio Controlado da Geofísica Rasa-IAGUSP showed that system has good resolution and can operates in urban area of high cultural noise. Keywords: dipole, electromagnetic, profiling, survey, detectionPermalink: https://doi.org/10.1190/sbgf2005-050FiguresReferencesRelatedDetails 9th International Congress of the Brazilian Geophysical Society & EXPOGEF, Salvador, Bahia, Brazil, 11-14 September 2005 ISSN (online):2159-6832 Copyright: 2005 Pages: 2274 publication data© 2005 Published in electronic format with permission by the Brazilian Geophysical SocietyPublisher:Society of Exploration Geophysicists HistoryPublished Online: 14 Sep 2005 CITATION INFORMATION Hugo F. Saar*, Francisco Y. Hiodo, Nilton Silva, Kleiton Blaine, Edgar Bronizeski, André Rugenski, Jorge L. Porsani, and Welitom R. Borges, (2005), "Sistema de prospecção geofísica pelo método Eletromagnético Indutivo (EM) com aplicações no Sítio Controlado do IAG/USP," SEG Global Meeting Abstracts : 238-243. https://doi.org/10.1190/sbgf2005-050 Plain-Language Summary KeywordsdipoleelectromagneticprofilingsurveydetectionPDF DownloadLoading ...

10.1190/sbgf2005-050

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TDEM survey in an area of seismicity induced by water wells in Paraná sedimentary basin, Northern São Paulo State, Brazil

Journal of Applied Geophysics (2012)

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

10.1016/j.jappgeo.2012.02.005

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Citations (16)

Ensino De Geofísica Aplicada: O Campus Universitário Como Laboratório De Exploração

6th International Congress of the Brazilian Geophysical Society (1999)

Carlos Alberto Mendonça Liliana Alcazar Diogo Jorge Luís Porsani Francisco Yukio Hiodo

We present an interpretation of geophysical data carried out by students during field class activities with<br>shallow seismic refraction, DC resistivity and IP soundings, magnetics, EM Slingram and ground penetrating<br>radar methods. To emphasize notions of integrated interpretation, we centralize the field classes in a same area.

Ground-Penetrating Radar

10.3997/2214-4609-pdb.215.sbgf272

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Preliminary analysis of the induced magnetic field in the TDEM method: Applications in fractured aquifers

Julian David Realpe Campaña Jorge Luís Porsani Cassiano Antônio Bortolozo

The time domain electromagnetic method (TDEM) has been widely used throughout the world for hydrological studies, due to its great sensitivity to map the subsurface conductive layers. In this work, authors will present the acquired TDEM data at Termas de Ibira region, countryside of Sao Paulo state, Brazil. The measurements were made through the fixed transmitter loop technique (Tx) with a moving 3D-coil receiver (Rx). The data analysis of the secondary magnetic using the 3D Rx coil aims to understand how these fields propagate in the subsurface, and also relating them to structures present in a fractured aquifer within the basalt layer of the Serra Geral Formation in the Parana basin. The results suggest the presence of fractures zones in the basalt that can be filled with water. The induced magnetic field profile showed the field behavior throughout the late times in the subsoil for each frequency.

10.1190/sbgf2015-035

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Estudos geofísicos integrados no lixão de Cuiabá, MT, Brasil: resultados preliminares

Brazilian Journal of Geophysics (2002)

Shozo Shiraiwa Solange Pereira Lisovsky Vagner Roberto Elis Jorge Luís Porsani Welitom Rodrigues Borges

Uma das maiores preocupações em projetos geoambientais é o estudo da contaminação dos solos e da água subterrânea causada pela disposição de lixo urbano. Os métodos geofísicos aplicados são um bom caminho para pegar algumas informações requeridas num programa de caracterização. Este trabalho mostra alguns resultados obtidos através de levantamentos de resistividade, eletromagnético indutivo e GPR (Ground Penetrating Radar), na busca de informações sobre o impacto causado pela área de disposição do lixo em Cuiabá, Estado do Mato Grosso, Brasil.

10.1590/s0102-261x2002000300004

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Geophysical investigations for the characterization of fractured rock aquifers in Itu, SE Brazil

Journal of Applied Geophysics (2004)

Jorge Luís Porsani Vagner Roberto Elis Francisco Yukio Hiodo

Ground-Penetrating Radar

Classification of discontinuities

Fracture zone

Geophysical survey

10.1016/j.jappgeo.2004.10.005

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Citations (57)

2D TEM Modeling for a Hydrogeological Study in the Paraná Sedimentary Basin, Brazil

International Journal of Geosciences (2017)

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

This work uses 2D TEM (Transient Electromagnetic) modeling for a hydrogeological study in the Paraná sedimentary basin. The study area is located at the northern region of the state of São Paulo, Brazil, where groundwater is exploited from two aquifer systems: one sedimentary, shallow, and the other crystalline, deep. The interest in applying the TEM method in this area owes to the high exploitation rates of groundwater from the crystalline aquifer system for irrigation, which is triggering considerable seismic activity locally. This aquifer system is composed of fractured basalt within the Serra Geral Formation and is about 120 m deep. Eighty-six TEM soundings were acquired at this location, but in nine cases the data did not fit the modelled curve for 1D geoelectrical models due to the geological complexity of the area. This paper shows 2D geoelectrical modeling results based on the FDTD (Finite Differences in Time Domain) method to explain the lateral resistivity variation within the geological setting. A 2D model was generated for each sounding and compared with 1D inversion models as well as with direct information from wells. The results show some vertical variations of about 10 to 30 meters on the upper interface of the basalt layer from Serra Geral Formation. They are located at approximately 60 meters from the center of the soundings. The existence of these 2D structures in the subsurface can be related to the drainage system in the study area. The presence of these structures may indicate a connection between the shallow and deep aquifer systems, acting like a conduit that may contribute to the seismic activity reported.

10.4236/ijg.2017.85038

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Aplicação de métodos geofísicos em Arqueologia: primeiros resultados obtidos no sambaqui fluvial Capelinha, Cajati-SP, Brasil.

Paula Brito-Schimmel Jorge Luís Porsani Levi Figuti Paulo DeBlasis

A utilizacao de metodos geofisicos em prospeccoes arqueologicas e crescente e se deve a necessidade, cada vez maior, de uma investigacao mais eficiente e nao destrutiva. Este trabalho mostra como as prospeccoes geofisicas puderam auxiliar as investigacoes arqueologicas no Sitio Capelinha. A area prospectada e um sambaqui fluvial, muito discreto na topografia, situado em Cajati (Sao Paulo, Brasil). Os metodos de magnetometria e georadar (GPR) localizaram os alvos com maior potencial arqueologico, como, por exemplo, uma paleofogueira, que ate o presente momento e unica em todo o sitio, com pontas de flecha e restos osseos associados e uma estrutura de escavacao-preenchimento.

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Citations (6)