Mapeamento de alvos forenses com GPR 3D

Alves, Kamylla de Lima; Blum, Marcelo de Lawrence Bassay; Borges, Welitom Rodrigues

doi:10.1190/sbgf2013-174

Cited by 2 publications

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“…As a result, in some regions of the country pioneering controlled site were built such as Forensic Geophysics, Environmental and Rescue (FORAMB in Belém -PA;Nascimento, 2009), the Criminalistics Controlled Site (SITICRIM in Brasília-DF; Blum & Russo, 2012) and The Forensic Geophysical Controlled Site (FGCS in Brasília-DF;Cavalcanti et al, 2018). (Silva et al, 2008;Nascimento, 2009;Catete, 2010;Brasil, 2013 (Blum & Russo, 2012;Alves et al, 2013;Alves et al, 2015;Buso et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Analysis of 2D and 3D GPR responses in the Federal University of Paraná Forensic Geophysics Controlled Site – a Case Study

et al. 2020

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ABSTRACT. In 2016, the Laboratory for Research in Applied Geophysics (LPGA), at the Federal University of Paraná, in partnership with the Federal Police of the State of Paraná and the University of Brasília built a Forensic Geophysics Controlled Site (FGCS-UFPR) to calibration of the applied geophysical method and strengthen forensic sciences in the State of Paraná. In the FGCS, several objects that simulate forensic, archaeological and paleontological targets were installed at extremely shallow depths. The materials were covered with clayey soil, typical of the region, and in some pits, fine sandy sediments were deposited. This study aims to verify the 2D and 3D responses of the ground penetrating radar (GPR) method applied to targets installed in the FGCS, in a post-precipitation period. In the acquisition of GPR data, a 700 MHz shielded antenna was used, with parallel 2D profiles and spaced 0.1 meters. The results indicated that the high clay content present in the soil, below 0.5 meters deep, caused a high attenuation of the electromagnetic signal and defined patterns of reflectors associated with the targets, excavations and the investigated environment. Thus, only targets with high electrical impedance were visualized in 2D and 3D GPR images.Keywords: ground penetrating radar, clay soil, targets, forensic sciences, archaeogeophysics. Análise dos resultados 2D e 3D de GPR no Sitio Controlado de Geofísica Forense da UFPRRESUMO. Em 2016, o Laboratório de Pesquisas em Geofísica Aplicada (LPGA), da Universidade Federal do Paraná, em parceria com a Polícia Federal do Paraná e a Universidade de Brasília, instalou um Sítio Controlado de Geofísica Forense (SCGF-UFPR) para a calibração do método geofísico aplicado e o fortalecimento das ciências forenses no Estado do Paraná. No SCGF foram instalados, em profundidades extremamente rasas, diversos objetos que simulam alvos forenses, arqueológicos e paleontológicos. Os materiais foram recobertos com solos argilosos, típicos da região, e em algumas cavas foram depositados sedimentos arenosos finos. Este estudo objetiva a verificação das respostas 2D e 3D do método radar de penetração no solo (GPR) aplicada aos alvos instalados no SCG, em um período pós-precipitação pluviométrica. Nas aquisições de dados de GPR foi aplicada a antena blindada de 700 MHz, com perfis 2D paralelos e equiespaçados em 0,1 metro. Os resultados indicaram que o alto teor de argila presente no solo, abaixo de 0,5 metro de profundidade, causou uma elevada atenuação do sinal eletromagnético e definiu-se padrões de refletores associados aos alvos, as escavações e ao meio investigado. Assim, apenas os alvos com alta impedância elétrica foram visualizados nas imagens GPR 2D e 3D.Palavras-chave: ground penetrating radar, solo argiloso, artefatos, ciência forense, arqueogeofísica.

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Section: Introductionmentioning

confidence: 99%

Analysis of 2D and 3D GPR responses in the Federal University of Paraná Forensic Geophysics Controlled Site – a Case Study

et al. 2020

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Geophysical surveying for the detection of ferrous-based objects: possibilities for depth estimative combining analytic signal and vertical integral of the anomalous magnetic field

et al. 2022

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The detection of buried clandestine objects challenges forensic and archeologic search group teams on varying terrains, and variable scales of research. Therefore, the study of controlled buried objects is useful for trainings in geophysical acquisition and processing. In this study, we applied ground survey data for testing the magnetic method at controlled geophysical sites for the location of ordinary objects and firearms. We used data filtering techniques in order to facilitate the location of magnetic targets. Also, we experienced the 3D inversion of analytic signal of the vertically integrated magnetic field (ASVI), for the location of targets in depth. As a result, the study determined the location of four magnetic targets, and a three-dimensional view was constructed from the estimated magnetic susceptibility. We concluded that modeling transformed magnetic data is an affordable technique for application in near-surface investigations. Also, this experiment exemplifies the relevance of magnetic methods for location of excavation sites on the basis of geophysical methods.

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Mapeamento de alvos forenses com GPR 3D

Cited by 2 publications

References 1 publication

Analysis of 2D and 3D GPR responses in the Federal University of Paraná Forensic Geophysics Controlled Site – a Case Study

Analysis of 2D and 3D GPR responses in the Federal University of Paraná Forensic Geophysics Controlled Site – a Case Study

Geophysical surveying for the detection of ferrous-based objects: possibilities for depth estimative combining analytic signal and vertical integral of the anomalous magnetic field

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