Melbourne’s metaphorical “dragon” is the Cascadia Subduction zone. Sections of the ocean floor are being pushed under the western edge of the North American continent creating pressure. Where the two plates join is a huge fault line, and the cooler upper portions of that fault are locked together. When they give way, typically between about 300 and 500 years, the result is a massive tsunami-triggering earthquake. The one scientists expect to occur off of our coast is expected to be a magnitude nine. And some government agencies have already been preparing for the inevitable event.