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This event has been reviewed by a seismologist.
Thursday, April 12, 2012 at 02:29:41 UTC
Wednesday, April 11, 2012 at 10:29:41 PM at epicenter
Location 41.998°N, 65.994°W
Depth 15.8 km (9.8 miles)
Region NORTH ATLANTIC OCEAN
Distances 203 km (126 miles) S of Yarmouth, Nova Scotia, Canada
290 km (180 miles) SSW of Bridgewater, Nova Scotia, Canada
About 40 percent of moderate to large earthquakes are preceded by nearby quakes that strike hours or days ahead of the main shock. Many are small and not clearly recorded. But Dodge devised a system to look at a set of foreshocks as an ensemble and refine the measurements of their properties. The result is an accurate view of the geometry of the foreshock sequence - pinpointing the epicenter of each earthquake and the orientation of its slip relative to the main shock.
The first earthquake is usually the worst, but aftershocks, or more earthquakes, may follow. Aftershocks usually occur within the next two days, but have also been recorded to happen for years. Their size, strength, and frequency usually diminish with time. (Incidentally, there is also such a thing as a foreshock, a small tremor that comes before a major earthquake.)
Originally posted by PuterMan
I know that it did not happen in 2004, but I shall take a look further back as see if this pattern has been seen before. I don't believe it has but I shall check it out tomorrow.
Thursday, April 12, 2012 at 03:29:22 UTC
Wednesday, April 11, 2012 at 09:29:22 PM at epicenter
Location 37.806°N, 112.100°W
Depth 0.8 km (~0.5 mile) (poorly constrained)
20 km (13 miles) N (357°) from Tropic, UT
27 km (17 miles) N (351°) from Cannonville, UT
28 km (18 miles) NNW (341°) from Henrieville, UT
208 km (129 miles) ENE (57°) from Mesquite, NV
328 km (204 miles) S (183°) from Salt Lake City, UT
Location Uncertainty horizontal +/- 0.8 km (0.5 miles); depth +/- 5.6 km (3.5 miles)
Parameters NST= 40, Nph= 40, Dmin=27 km, Rmss=0.45 sec, Gp= 83°,
M-type=duration magnitude (Md), Version=1
University of Utah Seismograph Stations
Event ID uu00009847
Originally posted by larrydavid84
Honestly, this is one of the best, most informative threads I have ever seen on ATS. Thank you guys for your hard work and attentiveness. I'm in Arkansas at the end of the New Madrid watching and waiting.