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originally posted by: snypwsd
a reply to: westcoast
Its not odd at all. Infact its perfectly normal when you live on or near a fault line.
originally posted by: Olivine
Interesting coincidence that the deep tremor (episodic tremor and slip, or ETS) has been active under Vancouver Island for the past 11 days:
source
This shows the most recent deep tremor activity. Realtime tremor map (set to 24hrs):
While seeing quakes in a seismically active area is NOT odd, this particular one, in fact, is.
First, it is the largest in the Puget Sound region for over a decade. Second, it was reported felt over a huge area by more than 13,000 people. (almost unprecedented reports came in). And yes...it IS odd for this size and depth of quake to have such strong sensor motion. It's because of where it struck. The Puget Sound Basin acts like a giant tub, and the very deep seismic waves literally bounce around in it.
originally posted by: Domo1
a reply to: westcoast
While seeing quakes in a seismically active area is NOT odd, this particular one, in fact, is.
First, it is the largest in the Puget Sound region for over a decade. Second, it was reported felt over a huge area by more than 13,000 people. (almost unprecedented reports came in). And yes...it IS odd for this size and depth of quake to have such strong sensor motion. It's because of where it struck. The Puget Sound Basin acts like a giant tub, and the very deep seismic waves literally bounce around in it.
I believe you, but what is actually odd about it? That it was felt for 150 miles? 13,000 people reporting it in this day and age actually seems like a relatively small number to me. What do you mean by sensor motion? It shook strangely? I don't know a thing about earthquakes, just trying to get a better understanding. My understanding is that quakes in the Eastern US are actually felt farther away than on the West Coast. I may be misinterpreting what you're saying, but it sounds like you're saying that the quake was felt a lot further because of the region. I just read something about a quake that was a 5.0 and felt for 300 miles.
From what I've read, no one seems to think there was anything odd. I know so little about it I don't have much of an opinion either way.
I'm just glad we're all safe. I really should start learning more about this. Any tips for a guy that lives in an old ranch style house? This place seems incredibly sturdy compared to newer construction I've lived in, and it's obviously survived everything for the last 50 years, but I'd prefer to do anything I can to insure it's going to be safe. Love my little house, plan on staying here for awhile and then renting it out again, so it may make sense to get someone out and look at the foundation and stuff right?
originally posted by: Olivine
a reply to: Domo1
It's my understanding that single-story wood-framed houses are incredibly resilient to earthquake motions, just be sure that your sill plates are firmly anchored to the foundation.
originally posted by: westcoast
The PNSN Director, John Vidale actually pointed this out last night and even said out loud that perhaps there could be a connection.
John Vidale at the Pacific Northwest Seismic Network says there has been slow slip under Vancouver Island over the past week. He thinks it could have prompted the 4.8 quake.
"We wonder about that, since the slow slip does load the part of the subduction zone that we expect to deliver a magnitude 9 earthquake some day,” Vidale said. “But it's complicated, so it's something we're studying pretty carefully."