Published on Feb 14, 2017
Feb.
14, 2017: Seismograms across North America noticed something unusual
today, a disturbance of some sort traveling linear across the United
States in 2 1/2 to 3 minutes time. These instruments, some many hundreds
of miles from each other shared the same odd reading at nearly the same
EXACT time.http://earthquake.usgs.gov/monitoring...
#MrMBB333
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