From PhysOrg: ‘New Research On Japanese Quake Ominous For Pacific Northwest’

Full piece here.

‘The longest record for a subduction zone is from Cascadia, where scientists have linked buried marshes and submarine landslides with a series of about 22 megaquake quakes going back 10,000 years. The time between quakes ranges from 200 to 1,000 years, with an average of about 500 years’

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.

USGS info here.  Some earthquake preparedness FAQ’s also from the USGS.

From The USGS: February 14th, 2011 Earthquake Near Mt. St. Helens-4.3Seattle Earthquake-January 30th 2009-4.5 On The Richter ScaleFrom The Seattle Times: ‘Hard Lessons Learned Since The 2001 Nisqually Quake’From OregonLive.Com: ‘Big Earthquake Coming Sooner Than We Thought, Oregon Geologist Says

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From The USGS: February 14th, 2011 Earthquake Near Mt. St. Helens-4.3

Full post here.

It occurred at approximately 10:35 a.m. PST.  A list of responders of those who felt it and their distance from the epicenter.  They don’t think that it was related to volcanic activity.

Also On This Site:  From YouTube Via Sound Politics: NASA-Mt St Helens: Thirty Years LaterSeattle Earthquake-January 30th 2009-4.5 On The Richter ScaleFrom The New Scientist: ‘Giant Crack Formed In Just Days’

Via Sound Politics: ’360 Degrees Of Mt. St. Helens’

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Seattle Earthquake-January 30th 2009-4.5 On The Richter Scale

Good info here at the USGS.

Apparently, it happen at 5:25 am PST, and I had no idea.  About 1 in 4 or 5 people I spoke with today either felt it, or were woken up enough to realize something had happened, but weren’t quite sure what.

Here’s a good map at the USGS site which measures how many people responded and intensity.

The vibrations and earth movement could be felt for only a few seconds, though it happened along the Nisqually fault, where the February 21, 2001 6.8 earthquake occured.

Map of that quake’s intensity here.

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