Hi Tara, hi everyone,
I thought that it might be a good idea to have the latest off-coast Oregon quake logged here:
Magnitude 5.3 - OFF THE COAST OF OREGON
2011 October 13 04:13:59 UTC
Versión en Español
* Scientific & Technical
* This event has been reviewed by a seismologist.
* Thursday, October 13, 2011 at 04:13:59 UTC
* Wednesday, October 12, 2011 at 08:13:59 PM at epicenter
* Time of Earthquake in other Time Zones
Location 43.440°N, 127.155°W
Depth 10.3 km (6.4 miles)
Region OFF THE COAST OF OREGON
Distances 233 km (144 miles) W of Coos Bay, Oregon
277 km (172 miles) WSW of Newport, Oregon
277 km (172 miles) NW of Brookings, Oregon
365 km (226 miles) WSW of SALEM, Oregon
Location Uncertainty horizontal +/- 13.2 km (8.2 miles); depth +/- 2.7 km (1.7 miles)
Parameters NST=391, Nph=392, Dmin=238.2 km, Rmss=1.13 sec, Gp= 79°,
M-type=body wave magnitude (Mb), Version=D
* Magnitude: USGS NEIC (WDCS-D)
Location: USGS NEIC (WDCS-D)
Event ID usc00068ex
Comments: this quake was orginally posted as a 5.9. Viz this post by
on the Quakewatch thread. However it soon got downgraded to a mag 5.3. TrueAmerican on the quakewatch thread had actually stated he
expected this because his own study of the data indicated the original mag listed was too high. (He estimated it was a 4.9 to 5.3. You can read his
I'm also interested in the fact that this was a very shallow quake. The depth of 10.3 km is not a "default depth" (as that would typically be 10 km
for this area), but one assigned after review by a seismologist.
Now, here is what interests me the most: back in early March this year, there was a series of quakes off the coast. Westcoast details them in her post
on this thread here
. They seemed to culminate with a mag 5.0 off the
coast of Oregon on March 8, at a depth of 17.8 km. However, within short order there were two more in almost the same location -- a mag 4.4 then a 4.6
-- both of them at a depth of 10.3 km. (Details in Westcoast's post
Then, in this post on March 8
I posted some details of a previous, rather
similar series of quakes from that general region that occurred in June, 2008. I wrote this post to show that such events were not unknown, but at the
same time, I said:
I have to comment that when I saw the first couple of quakes off the coast there this time round, I wasn't too concerned because several times
before, I've seen instances of two or three quakes within a period of a few days. I started to get a bit more interested when the fourth one popped
up, and then when I saw the mag 5.0 this morning (my time) I thought just like some of you did: "Uh-ohh... That's not an aftershock... They're getting
This area now has me pretty concerned. Not because it necessarily portends anything major, but because it's an anomaly and I don't like anomalies if I
can't figure out why they're anomalous.
Now to the main point I want to make: that series of quakes noted above occurred on March 8, 2011.
Anyone who reads the next few days of posts on this thread will note two things: an obvious increase in nervous tension among the posters, and also
the increasing nervousness of Westcoast's dogs.
And then -- well, I think we all know what occurred on the other side of the Pacific on March 11, 2011 -- just three days after a that series of
quakes off the PNW.
I'm beginning to wonder if that series of quakes was some kind of an indicator. And naturally, I am also wondering what it will mean if we get a
similar series of quakes connected with this most recent event.
Granted, the March events might have been purely coincidental and unconnected, but it is
interesting, to say the least. I think it might be
worth doing some digging to see if there have been similar correlations in the past.
edit on 13/10/11 by JustMike because: of typos and fixed a bad linky.