256 4TH CAN. PERMAFROST CONF. (1982) Detailed seismic refraction analysis of ice-bonded permafrost layering in the Canadian Beaufort Sea
The recent application of high-resolution, multi-channel, seismic reflection techniques in the Cana-dian Beaufort Sea has yielded better sources of data for refraction interpretation of ice-bonded sub-sea permafrost. This paper discusses some examples of this work which demonstrate the structural de...
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| Language: | English |
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.583.5533 http://pubs.aina.ucalgary.ca/cpc/CPC4-256.pdf |
| Summary: | The recent application of high-resolution, multi-channel, seismic reflection techniques in the Cana-dian Beaufort Sea has yielded better sources of data for refraction interpretation of ice-bonded sub-sea permafrost. This paper discusses some examples of this work which demonstrate the structural detail which can be obtained. A seismic line transecting the Beaufort Sea shelf has been interpreted with data spacings of 125 m. The results confirm early results of Hunter et al. (1978) and show detailed structural and velocity varia-tions of ice-bonded zones. Detailed seismic results at two off-shore drill sites have been examined. Velocity variations indicate optimum zones where ice-content is low or absent suggesting that such detailed refraction surveying can be of use in geotechnical site evaluations. L'application recente de techniques de sisrnique-reflection a voies multiples donnant une resolution elevke, lors d'experiences effectutes dans la mer de Beaufort, a fourni une meilleure source de don-nees pour interpreter la refraction des ondes sur le pergelisol sous-marin de la zone bordee par les gla-ces. Dans le present article, on commente certains exemples de ces recherches, qui montrent avec quelle precision on peut determiner la structure du fond marin. Les donnees ont ete prises a un intervalle de 125 rn de long d'une ligne sismique recoupant la plate-forme de la mer de Beaufort. Ces travaux confirment les resultats obtenus auparavant par Hunter et al. (1978) et montrent les variations dttaillCes de la structure et de la vitesse dans les zones bordees par les glaces. On a examine en dew sites de forage offshore les resultats dttaillks de la prospection sismique. Les variations de vitesse indiquent les zones optirnales ou la teneur en glace est faible ou nulle; ceci suggere que des leves detailles de sismique-refraction peuvent servir a I'tvaluation de sites faisant I'objet d'une exploration geotechnique. Proc. 4th Can. Permafrost Conf. (1982) |
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