Cascadia's eastern boundary is perhaps somewhat less well-defined. For our purposes, we define it as the crest of the Cascade range. This zone slopes gently eastward beneath the continental shelf and extends for an unknown distance east of the actual coastline. Indeed, if a future subduction earthquake weighs in with a magnitude 9.0, it will essentially affect the whole Cascadia region. CREW's work on the subduction earthquake hazard mitigation will undoubtedly aid in preparing for these smaller but still potentially disastrous earthquakes.
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