Earthquake Sources

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The Cascadia region is a tectonic-plate boundary between the subducting oceanic Juan de Fuca, Gorda, and Explorer Plates and the over-riding continental North America Plate. Over millions of years, these plates converge at an average rate of about 4 cm/yr.   A variety of earthquake types occur as a consequence of this convergence including:

  • Cascadia subduction interface earthquakes;
  • Crustal earthquakes;
  • Distant tsunamis from other earthquake regions;
  • Earthquake swarms;
  • Intraplate earthquakes; and
  • Volcanic earthquakes.