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Tsunami sand beneath tidal marsh at Tofino, BC
A layer of clean sand is sharply bounded by peat and mud in a pit dug at a marsh just east of Tofino on the west coast of Vancouver Island. The sand occurs as a sheet that thins and fines landward and contains marine microfossils. It was deposited by a landward surge of seawater at the time of the last great earthquake at the Cascadia subduction zone in A.D. 1700. (photo by John Clague).
The sand occurs as a sheet that thins and fines landward and contains marine microfossils.
2011-09-11 22:47:30, 44.767, -111.095, 2.2, 6.4, Yellowstone National Park. Montana
2011-09-11 01:07:18, 44.701, -110.997, 1.2, 6.6, Yellowstone National Park. Wyoming
2011-09-08 15:54:04, 44.415, -110.780, 1.3, 7.2, Yellowstone National Park. Wyoming
2011-09-06 14:31:02, 44.448, -110.962, 1.2, 7.0, Yellowstone National Park. Wyoming
2011-09-06 13:18:26, 44.617, -110.422, 2.3, 2.0, Yellowstone National Park. Wyoming
Originally posted by PuterMan
Now once again with a little more data we can see that this is beginning to look more like a foreshock, main shock, aftershock sequence. So was this a foreshock to a mega quake? I am still hanging my hat on the no stand and saying that this was a reasonably normal event in this area and not likely to be a precursor to a mega-quake.
Apart from anything else mega-quakes this year have been banned as they would spoil my prediction!
edit on 12/9/2011 by PuterMan because: Ah, the inevitable speeling erra
One can indeed say a fault has activated because of these readings (IR and electro-magnetic - radon I have my doubts about) and this has been known for some time. Remember the ATS member Roald? Does not seem to have been around for a while but he was involved in this I believe. There are others on ATS who have knowledge of this as well, apart from which it is sort of obvious if you think about it. The trick was / is having the right detectors in the right place and up in the inner space envelope is the best place. This will progress that is for sure. They will also make mistakes, that is for sure. One thing you can also be VERY sure of is that if they have the technology they will NOT put it on a web site for all the doomsday kooks in the world to misinterpret and run round saying there is about to be a mag 10 in NY / Tokyo / Cascadia / SF / New Madrid / Chile / Indonesia etc etc. No, not no way Jose.
We retrospectively analyzed the temporal and spatial variations of four different physical parameters - outgoing long wave radiation (OLR), GPS/TEC, Low-Earth orbit tomography and critical frequency foF2.
I am wondering why none of the larger after-shocks have been recorded by USGS for the 6.4 Vancouver quake on Sept. 9th?
According to local reports, and by simply looking at some of the near-by seismograph stations, it is very clear that there were several above the 3.5 threshold.
Earthquake Canada finally started listing some of them on Monday, but also in contradiction to local reports, they only have one above the the 3.5 USGS reporting threshold:
2011/09/09 19:44:43 49.36N 127.21W 35.1 4.5ML 88 km WSW of Gold R.,BC
Yet....this is STILL not listed on your site.
In light of the fact that a lack of after-shocks can sometimes be an indicator of a possible larger event (making the 6.4 a fore-shock), I would think the USGS would want to keep the public informed with accurate information. Especially since we just had a three month early ETS event in the same area.
Could you tell me why these aren't being reported?
Thank you for your time,