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Three Main Shocks
December 16, 1811 - Magnitude ~7.7
January 23, 1812 - Magnitude ~ 7.5
February 7, 1812 - Magnitude ~ 7.7
Source
It's happened before 1811-1812
The geologic record of pre-1811 earthquakes reveals that the New Madrid seismic zone has repeatedly produced sequences of major earthquakes, including several of magnitude 7 to 8, over the past 4,500 years.
Source
Many things combined to make the year 1811 the Annus Mirabilis of the West. During the earlier months, the waters of many of the great rivers overflowed their banks to a vast extent, and the whole country was in many parts covered from bluff to bluff. Unprecedented sickness followed. A spirit of change and a restlessness seemed to pervade the very inhabitants of the forest. A countless multitude of squirrels, obeying some great and universal impulse, which none can know but the Spirit that gave them being, left their reckless and gambolling life, and their ancient places of retreat in the north, and were seen pressing forward by tens of thousands in a deep and sober phalanx to the South.
The probability for an earthquake of magnitude 6.0 or greater is significant in the near future, with a 50% chance by the year 2000 and a 90% chance by the year 2040. A quake with a magnitude equal to that of the 1811- 1812 quakes could result in great loss of life and property damage in the billions of dollars. Scientists believe we could be overdue for a large earthquake and through research and public awareness may be able to prevent such losses.
Originally posted by Wrabbit2000
I wonder if there are others like that and we aren't hearing it. If so...Lets share and figure out patterns, IF any, and whether things ARE odd or simply odd to an individual who just hadn't seen a thing themselves before. *IF* The New Madrid is up for another triple play repeat, then millions will be devastated.
Originally posted by ns9504
Originally posted by Wrabbit2000
I wonder if there are others like that and we aren't hearing it. If so...Lets share and figure out patterns, IF any, and whether things ARE odd or simply odd to an individual who just hadn't seen a thing themselves before. *IF* The New Madrid is up for another triple play repeat, then millions will be devastated.
No idea if this qualifies, but it's free to post, right :-)
I'm ~120 inland from New York City, northeast PA on the west side of the mountains. Over the last week we've had hundreds, and I mean hundreds, of seagulls out here on the river. We do have a handful from time to time, and I know some species live inland, but it was odd enough for me to note it.
It always makes me think of the movies, when huge flocks of birds fly inland before the giant tsunami engulfs NYC :-)
Originally posted by Wrabbit2000
Thank you for adding that.
One thing that struck me about reading books on the New Madrid quakes and the reports everyone figured might be related long after the fact, was how UNrelated it all would have appeared at the time, in any one place. Birds here, Squirrels there, Rats in another place. In hindsight and taken together to suggest a pattern to the known event, I have to admit there sure seemed to be one alright.
So...by all means, I appreciate that. If it was odd enough to notice without ever looking for it...it's worth noting. Some of the oddity reports put together after New Madrid were of critters doing odd things clear out into the Eastern Ohio Valley...and of course we didn't have the population for people to even see much back then. So, who knows how much actually did happen that would have indicated something seriously out of balance before they hit?