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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

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

Texto completo
Autor(es):
Porsani, Jorge Luis [1] ; Almeida, Emerson Rodrigo [1] ; Bortolozo, Cassiano Antonio [1] ; Monteiro dos Santos, Fernando Acacio [2]
Número total de Autores: 4
Afiliação do(s) autor(es):
[1] Univ Sao Paulo, Inst Astron Geofis & Ciencias Atmosfer IAG, Dept Geofis, BR-05508090 Sao Paulo - Brazil
[2] Lisbon Univ CGUL, Ctr Geophys, Lisbon - Portugal
Número total de Afiliações: 2
Tipo de documento: Artigo Científico
Fonte: JOURNAL OF APPLIED GEOPHYSICS; v. 82, p. 75-83, JUL 2012.
Citações Web of Science: 4
Resumo

This article presents TDEM results from an area with recent induced shallow seismicity. The purpose was to do a geoelectrical mapping of sedimentary and fractured basaltic aquifers for better understanding of the hydrogeologic setting. The study area is in the Parana basin where flood basalts are overlain by sedimentary units near the city of Bebedouro, northern Sao Paulo State, Brazil. 86 TDEM soundings were acquired in an area of 90 km(2) in the Andes and Botafogo study areas. The soundings were chosen next to wells for calibration, and also along profiles crossing the seismically active areas. 1-D interpretation results showed the general geoelectrical stratigraphy of this part of the Parana basin. The upper geoelectrical layer is the shallow sedimentary aquifer (Adamantina formation) with less than 80 m thickness. The second geoelectrical layer contains the upper basalts of the Serra Geral formation at about 60-80 m depths. A saturated fractured basalt zone between 100 and 300 m depths was identifiable on various TDEM soundings. This depth range corresponds to the range of hypocentral depths for more than 3000 micro-earthquakes in this area. The lower basalt layer was estimated to lie between 400 and 650 m depth. The deepest geoelectrical layer detected by various TDEM soundings corresponds to the Botucatu sandstone (Guarani aquifer). Results suggest that the high-discharge wells are located in the fractured zone in the middle basalt of the Serra Geral formation. There is a good correlation between seismically active areas, high discharge wells (>190 m(3)/h), and fracture zones in the middle basalt. The results reinforce the hypothesis that the shallow seismic activity in the Bebedouro region is being triggered by high rates of groundwater withdrawal. (C) 2012 Elsevier B.V. All rights reserved. (AU)

Processo FAPESP: 12/02709-4 - TDEM survey in an area of seismicity induced by water wells in Paraná sedimentary basin, Northern São Paulo State, Brazil
Beneficiário:Jorge Luís Porsani
Linha de fomento: Auxílio à Pesquisa - Publicações científicas - Artigo
Processo FAPESP: 09/08466-3 - Caracterização geoelétrica de aquíferos fraturados em basaltos na região de Bebedouro, SP, por meio de inversão conjunta de SEVs e sondagens TDEM
Beneficiário:Jorge Luís Porsani
Linha de fomento: Auxílio à Pesquisa - Regular
Processo FAPESP: 07/04325-0 - Tremores de terra em Bebedouro-SP, induzidos por poços tubulares: evolução da atividade e causas estruturais
Beneficiário:Marcelo Sousa de Assumpção
Linha de fomento: Auxílio à Pesquisa - Regular