A little more detail about the February 11th, 2012 5.9 earthquake off the coast of Oregon.
Related On This Site: The last big Cascadia subduction zone earthquake likely occurred on Jan 27th, 1700, at magnitude 9.0. The article suggests an occurence anywhere from 300-350 year intervals up to 400-600 year average intervals (new research suggests the former). It’s just over 311 years and counting.
From The USGS: February 14th, 2011 Earthquake Near Mt. St. Helens-4.3……Seattle Earthquake-January 30th 2009-4.5 On The Richter Scale…From The Seattle Times: ‘Hard Lessons Learned Since The 2001 Nisqually Quake’…From OregonLive.Com: ‘Big Earthquake Coming Sooner Than We Thought, Oregon Geologist Says