• The Political Commentator, Michael Haltman
What is a megathrust earthquake and why is the U.S. pacific northwest coastline at risk?
"... Megathrusts' are the world's largest earthquakes, and happen in a 'subduction zone', a region where one of the earth's tectonic plates is thrust under another. The last one involving Cascadia was estimated at magnitude 9 on the Richter scale, according to Natural Resources Canada.
The Juan de Fuca plate is being forced under the North America plate along the Cascadia fault and, as large parts of the plates are locked together, stress is being built up until an eventual breakage causes a massive earthquake..." (Daily Mail)
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