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| Titel |
Soil-gas radon monitoring in an active granite quarry from central Portugal |
| VerfasserIn |
A. J. S. C. Pereira, S. M. Barbosa, L. J. P. F. Neves, F. Aumento |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 11, no. 7 ; Nr. 11, no. 7 (2011-07-06), S.1845-1849 |
| Datensatznummer |
250009555
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| Publikation (Nr.) |
 copernicus.org/nhess-11-1845-2011.pdf |
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| Zusammenfassung |
| 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 Bq m−3, which can be explained by the local presence of
uranium anomalies in the regional late-orogenic 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. |
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