![]() But scientists believe that earthquakes with magnitudes greater than 8, so-called “megathrust events,” occur along this fault on average every 400 to 500 years. Since then, the earth beneath the region - which includes the cities of Vancouver, Seattle and Portland - has been relatively quiet. local time, the Juan de Fuca plate beneath the ocean in the Pacific Northwest suddenly moved, slipping some 60 feet eastward beneath the North American plate in a monster quake of approximately magnitude 9, setting in motion large tsunamis that struck the coast of North America and traveled to the shores of Japan. Virtual Mega-Quake Shows Earthquake Could Inflict Major Damage On Pacific Northwest U.S. ![]() ![]() As reported in the February 28, 2008, issue of Science Daily:
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