The past twenty years have witnessed three major paradigm shifts in our understanding of earthquake hazards in the Pacific Northwest. The first paradigm shift was the recognition in the 1980's that the Cascadia subduction zone is capable of great earthquakes. The locked part of the Cascadia subduction zone lacks instrumental seismicity, but geological evidence shows that it can produce an earthquake of MW 9, larger than any expected for California south of Cape Mendocino. In response to the geological evidence, building codes have been upgraded, tsunami inundation maps have been prepared for coastal areas from northern California to northern...
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