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Vancouver Island Region: Uniquely vulnerable
Vancouver Island is largely covered by mountains, rising to about 2,200 metres above sea level. The terrain is rugged and over-steepened, so combined with high rainfall (falling primarily in winter months), seismic activity from the Juan de Fuca and Explorer plates (see http://www.pgc.nrcan.gc.ca/pgchome.htm for information about Vancouver Island’s seismic environment) and glacier related sediments left on steep slopes, makes Vancouver Island uniquely vulnerable to landslides. In general, steep slopes are those greater than about 30o, however, that amount may be lower under certain conditions.
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