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Originally posted by jadedANDcynical
More to follow (I HATE the new post limits!!!!!)
Near southern Vancouver Island, the episodic slips are characterized by a recurrence interval of about 13 to 16 months, with a typical duration of about 10 days and displacement of 5 mm at the surface.
Second, more than 10 cycles of slip events have occurred at regular time intervals along various locations along the entire Cascadia subduction zone (Figure 3), but not even once has significant inter-plate earthquakes followed the slip events, suggesting that perturbations due to episodic slips have little cumulative effect on the mega-thrust.
A similar, but not identical case has been reported in southern Japan where the northern edge of the Philippine Sea plate subducts under Japan. In this case, episodic slips typically last for a few days with a short recurrence interval of about 6 months [26, 30, 31]. The slip events correlate with strong tremor activities but intervening tremor activities are higher than those seen at Cascadia. The tremors in southern Japan contain frequencies up to 10 Hz and have durations that vary from hours to even weeks. Also the overall source area of tremors seems to be very large, over 600 km in length
It was an innocent experiment. Tesla had attached a small vibrator to an iron column in his New York City laboratory and started it vibrating. At certain frequencies specific pieces of equipment in the room would jiggle. Change the frequency and the jiggle would move to another part of the room. Unfortunately, he hadn't accounted for the fact that the column ran downward into the foundation beneath the building. His vibrations were being transmitted all over Manhattan.
For Tesla, the first hint of trouble came when the walls and floor began to heave (ref 1). He stopped the experiment just as the police crashed through the door. It seems he'd started a small earthquake in his neighborhood smashing windows, swayed buildings, and sending panicked neighbors rushing into the streets. The police had frequently responded to complaints about Tesla's unusual activities.
An English engineer, J.H. Hamil, offered the American army plans for producing " an invisible ray
capable of stopping airplanes and automobiles in midflight," invented by a German scientist. The ray
device was said to have been used the previous summer to bring down French planes over Bavaria.
Hamil noted, however, that "the fundamental work was done by Nikola Tesla in Colorado Springs
about 30 years ago. He built a powerful electrical coil. It was found that the dynamos and other
electrical apparatus of a Colorado fuel company within a 100 yards or so were all put out of business.
Dr. John G. Trump was the main government official who went over Tesla's secret papers after his death in 1943. At the time, Trump was a well-known electrical engineer serving as a technical aide to the National Defense Research Committee of the Office of Scientific Research & Development, Technical Aids, Div. 14, NTRC (predecessor agency to the CIA's Office of Scientific Intelligence). Trump was also a professor at M.I.T., and had his feelings hurt by Tesla's 1938 review and critique of M.I.T.'s huge Van de Graaff generator with its two thirty-foot towers and two 15-foot-diameter (4.6 m) balls, mounted on railroad tracks—which Tesla showed could be out-performed in both voltage and current by one of his tiny coils about two feet tall. Trump was asked to participate in the examination of Tesla's papers at the Manhattan Warehouse & Storage Co. Trump reported afterwards that no examination had been made of the vast amount of Tesla's property, that had been in the basement of the New Yorker Hotel, ten years prior to Tesla's death, or of any of his papers, except those in his immediate possession at the time of his death. Trump concluded in his report, that there was nothing that would constitute a hazard in unfriendly hands.
Originally posted by zworld
The pdf says something very interesting. The ETS events that occur in Japan do seem to correlate with events in that area. But so far I havent found anything that addresses whether these ETS events correlate to other EQs around the world.
edited to add emphasis
We find that the triggered tremor and fault creep can be initiated by distant earthquakes as small as magnitude 5.4 and can persist for several days after the seismic waves have passed. Our observations of prolonged tremor activity provide a clear example of the delayed dynamic triggering of seismic events. Fault creep has been shown to trigger earthquakes10, 11, 12, and we therefore suggest that the dynamic triggering of prolonged fault creep could provide a mechanism for the delayed triggering of earthquakes.
This blog is quickly being thrown together now that this next ETS seems to be starting early....
The 2011 ETS was expected to start in late October or early Novemeber based on the normal inter-ETS of 14-15 months. The arrays were to be restarted in early to mid Octorber.... BUT ------ On July 23 a tremor burst near Olympia (which we all thought was a typical short-lived inter-ETS tremor burst) just kept going. We waited for the tremor to die out, but it didn't. First it moved a bit south and then east and then hovered near Olympia until early August. We kept thinking it couldn't be a real ETS. It was too soon and seemed to start way too slowly. Besides much of the tremor was not as strong as we were used to seeing during previous ETS. But, after more than a week of significant tremor we started to panic and contacted the PASSCAL instrument center to see about getting some dataloggers back in the field sooner than originally requested. ....
On Aug 5, when the tremor started clearly moving slowly north we double paniced and made preparations to head to the field ASAP.
On Aug 5, when the tremor started clearly moving slowly north we double paniced and made preparations to head to the field ASAP
Sep 6, 2011 - This ETS is over. The last burst of tremor seen at the north end of this ETS in BC occurred on Sep 3. It was followed on Sep 4 by a burst back in the south end of Puget Sound but nothing has been seen since then. Thus we declare the ETS over. It lasted from Jul. 23 until Sep. 4, longer than any previous ETS well recorded and processed by us. Besides starting much earlier than expected it started farther south than most previous ones and didn't proceed quite as far north. - A team of 8 are currently in the field recovering all of the AofA instruments and the remaining CAFE ones. Between Sep 6 and 8 over 90 seismic stations will be recovered from the field and preparations made to ship them back to the PASSCAL instrument pool. The data collected for this ETS will not be available for analysis for a week or two but should be an interesting set.
Date-Time Friday, September 16, 2011 at 19:26:42 UTC
Saturday, September 17, 2011 at 04:26:42 AM at epicenter
Time of Earthquake in other Time Zones
Location 40.288°N, 142.727°E
Depth 36.3 km (22.6 miles)
Region NEAR THE EAST COAST OF HONSHU, JAPAN
Distances 108 km (67 miles) ESE of Hachinohe, Honshu, Japan
149 km (92 miles) ENE of Morioka, Honshu, Japan
177 km (109 miles) ESE of Aomori, Honshu, Japan
574 km (356 miles) NNE of TOKYO, Japan
Location Uncertainty horizontal +/- 15.3 km (9.5 miles); depth +/- 4.2 km (2.6 miles)
Parameters NST=447, Nph=447, Dmin=195.9 km, Rmss=0.82 sec, Gp= 32°,
M-type=regional moment magnitude (Mw), Version=7
Source Magnitude: USGS NEIC (WDCS-D)
Location: USGS NEIC (WDCS-D)
Event ID usc0005vv7
Originally posted by jadedANDcynical
reply to post by JustMike
I have very little formal education. I am (and always have been) largely self-taught. I don't even have a high school diploma but rather only G.E.D. So on paper I'm below average. I don't know if this will color the way in which my posts are though of, but I do want everyone to know this.