Cascadia Subduction Zone Response

According to a BBC documentary titled “Cascadia Subduction Zone,” (https://www.youtube.com/watch?v=VR95-T6DvQM) we in North America are at risk of having a mega thrust earthquake of a huge magnitude. The evidence is quite convincing. It all starts with the native legend of a Thunderbird causing a massive earthquake, scientists wondered if this was not only a fictional legend but it was also documenting a REAL event that really took place. In the year 1700 Japan was hit by an orphan tsunami, meaning that the earthquake was absolutely massive and very far away. There is evidence that the earthquake that caused this orphan tsunami that hit japan took place in NA by the Cascadia plate. There is a “Ghost Forest” near Cascadia that is full of dead trees with no definite signs of what killed them, a scientist concluded the trees died around the 1700s, an earthquake of huge magnitude was suspected to have killed the trees and cause the orphan tsunami in japan. One of these pieces on evidence is not enough because they are required to be put together in order to draw a connection. For example what in the world does the tsunami in japan have to do with us in NA? But using the other piece of evidence we can connect an earthquake in Cascadia to japan. The impacts of a mega thrust earthquake would be catastrophic to Vancouver. Older, Brick and mortar buildings would almost surely collapse, newer and extremely well engineered skyscrapers would sway side to side but in the worst case scenario a skyscraper could totally collapse which would be terrible. Vancouver would have a super long rebuilding process and the economic effects would be pretty terrible as well.