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MAP 4.0 2011/08/14 19:27:03 41.027 -125.326 2.5 OFFSHORE NORTHERN CALIFORNIA
Yes, they are talking about a mega-thrust event, where a large portion of a subduction zone fault gives way over a considerable distance, in just a few seconds. Something like that happening along the west coast would most certainly cause catastrophic damage and a sizable tsunami. Very serious indeed, and it is one big factor for me staying away from the place and living on the east coast. That sukka is coming way too close to being overdue, and some say it is WAY overdue.
Also, I don't think that's unreasonable at all to suspect that what you've been hearing could be associated with this type of "slow" tremor, but note what the article said that they can't be felt at the surface. It is taking seismos to detect them, and I can see why they are having a tough time pinning down the depths of these, because it is out at sea.
The fact that they are recurring on a predictable, repeatable schedule is also very suspect to me, and almost implies something man made. Or well, not natural anyway.
I wouldn't put it beyond nature to have some other kind of thing going on down there such as a resonant cavity of water, oil, or fluid of some kind, which when it moves through causes some kind of tremor- like a harmonic tremor of sorts. It would be interesting to get some of these tremors on the spectragraph, and analyze for frequency content. That will tell some things right away.