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An Ask an Earth-Scientist answer by Dr. Gerard Fryerm suggests a few meters is possible. >"Will part of Vancouver Island "break off and sink," or "split in two

An Ask an Earth-Scientist answer by Dr. Gerard Fryerm suggests a few meters is possible. >"Will part of Vancouver Island "break off and sink," or "split in two at Alberni Inlet?" No. In a big earthquake the seafloor offshore from Vancouver Island will be uplifted and the area along the coast will sink, but at worst that sinking will only be a few meters. If you live very close to the beach and close to sea level then there is a possibility that your house will be flooded, but no big piece of the island is going to break off and disappear. It is possible that there will be submarine landslides along the steepest slopes offshore, but each of those is likely only be small in extent. http://www.soest.hawaii.edu/GG/ASK/vancouver.html http://www.soest.hawaii.edu/GG/ASK/vancouver.html

btilly 3y ago
It doesn't take a lot of meters to pose a big problem for Victoria, BC. Look at a topographical map: https://en-ca.topographic-map.com/map-1926m2/Victoria/?center=48.43655%2C-123.35561&zoom=13 https://en-ca.topographic-map.com/map-1926m2/Victoria/?cente... That said, https://www.esquimalt.ca/sites/default/files/greater_victoria_tsunami_map.pdf https://www.esquimalt.ca/sites/default/files/greater_victori... is built on more up to date information than I had. And suggests that subsidence + tsunami is only 4 meters. Which doesn't pose a serious threat. (If they are wrong and get a 10 meter combination, of course, that would be a far, far worse story.)