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Originally posted by sorgfelt
I found an article describing very slow earthquakes happening in the NorthWest for some time.
This seems to be the perfect explanation.
Here is the link:
On February 28, 2001 one of the largest earthquakes in Washington caused serious damage in Olympia and Seattle. The 6.8 magnitude quake could be felt from the Willamette Valley into British Columbia.
Scientists say the earth moved in slow motion. Where the Nisqually quake took 45 seconds, last summer’s took more than two weeks.
Dragert says these regular slow motion quakes appear to be happening every 15 months or so. They are moving the earth in a strip nearly 20 miles wide stretching from the middle of Vancouver Island in Canada down through Puget Sound extending to southern Oregon.
Evelyn Roeloffs: "It kind of behaves like a chocolate bar. Where the great earthquakes happen when the rock is like a chocolate bar that you just took out of the freezer and it can snap. And then as it goes further beneath the continent, it’s more like a chocolate bar that you left in your car on a hot sunny day. It just oozes."
As the plate slowly slips deep under the continent, scientists are quite sure this motion is not relieving stress on the Cascadia Subduction Zone. In fact, this could be adding more pressure to the very zone where a massive megathrust earthquake is considered likely.