Utilize este identificador para referenciar este registo: https://hdl.handle.net/10316/110043
Título: Soil-gas radon monitoring in an active granite quarry from central Portugal
Autor: Pereira, A. J. S. C. 
Barbosa, S. M.
Neves, L. J. P. F. 
Aumento, F.
Data: 2011
Projeto: IMAR-CMA 
FCT (contract under Programme Ciencia2008) 
Título da revista, periódico, livro ou evento: Natural Hazards and Earth System Science
Volume: 11
Número: 7
Resumo: Seven soil-gas radon monitoring stations were placed along the active front of a granite quarry in Canas de senhorim, Central Portugal, recording continuously for 81 days. Important differences in the radon concentration were found between stations, with average values comprised between 102 and 2982 Bqm−3, which can be explained by the local presence of uranium anomalies in the regional lateorogenic Hercynian granite, usually associated with faults. One of the boreholes exhibits large radon anomalies lasting for several days, and two, contrary to the others, show a clear daily periodic behaviour, with minima around 19:00 LT and maxima around 07:00 LT. The different patterns observed in stations placed at such a short distance (<100 m) has no clear explanation and deserves further investigation. Data analysis shows no evidence of soil-gas radon concentration changes during explosions carried out at the quarry. This is likely to result from the absence of a progressive stress field affecting the rock, as typically occurs before an earthquake.
URI: https://hdl.handle.net/10316/110043
ISSN: 1684-9981
DOI: 10.5194/nhess-11-1845-2011
Direitos: openAccess
Aparece nas coleções:FCTUC Ciências da Terra - Artigos em Revistas Internacionais

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