EESB18H3 Lecture : EESA05 - Environmental Hazards - Lec 7 (near-verbatim).docx
22 Jan 2013
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West coast of canada more prone to eqs; queen charlotte"s. Slide 2: bc earthquake oct 27, 2012. 7. 7 on richter scale = no injuries. American gvt sent warning earlier than cdn gvt. West coast of canada = prone to eqs because can find all the recognized faults in west coast get diff boundaries here divergent, convergent boundaries in this area and transform faults (strike-slip) Juan fuca plate is being subducted beneath n. american plate = subduction: how it"s moving it"s because of the ridges along the straight lines. One ridge above it = called explorer ridge. And the ridge below it = called endeavour ridge. Have these 3 ridges that are acting as a rift where magma is coming out and pushing these plates apart. The force that"s required to push that smaller plate beneath the n. american plate is created by these ridges by these divergent zones. Along these, also have fracture zones where you have transform mvt.
