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Subbottom profiling has been carried out on jive lakes on Vancouver Island using a portable 3.5-200 kHz acoustic projiler. The objective of the survey was to document disturbance of late glacial and postglacial lacustrine sediments and, from this, assess paleoseismicity in the region. The acoustic profiles show that there has been widespread subaqueous landsliding in four of the five surveyed lakes. Many of the landslides were triggered by the 1946 Vancouver Island earthquake (M7.2) centered near Comox, but others probably are not related to earthquake activity. Possible earthquake-induced diapirs and tilted and folded sediments were found in two of the lakes. Resume On a etabli des profits des couches sous le fond de cinq lacs de l'fle de Vancouver, en employant un profileur acoustique de frequence 3,5-200 kHz. Ce !eve avait pour but de fournir des renseignements sur les perturbations des sidiments lacustres d'origine tardiglaciaire et post-glaciaire, a partir desquels il serait alors possible d'evaluer la pateosismicite de la region. Les profits acoustiques montrent qu 'il y a eu, en de nombreux endroits, des glissements de terrains subaquatiques dans quatre des cinq lacs explores. Un grand nombre de glissements de terrain ont ete provoques par le seisme survenu en 1946 dans l'fle de Vancouver (M 7,2) et centre pres de Comox, mais les autres ne sont probablement pas lies a une activite sismique quelconque. On a rencontre dans deux des lacs des structures qui pourraient etre des diapirs d'origine sismique, et des sidiments inclines et plisses. 1 Terrain Sciences Division, Ottawa. 2 Department of Physics, Royal Roads Military College, FMO Victoria, British Columbia, VOS IBO.

Application of Subbottom Profiling To Assessing Seismic Risk On Vancouver Island, British Columbia