Abstract
Megaquakes, which are subduction earthquakes with magnitudes of 8 or greater, occur about every 500 years on average along the Cascadia Subduction Zone in the Pacific Northwest. The earthquakes and related tsunamis can cause enormous damage. However, they may not be the most urgent seismic threat in the region, according to John Clague, a professor and expert on natural hazards at Simon Fraser University (SFU) in British Columbia.
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