Posted on 12/15/2018 10:03:41 AM PST by blam
Large earthquakes arent supposed to happen in Tennessee. On Wednesday, the largest earthquake in 45 years hit eastern Tennessee, and it made headlines all over the nation. The magnitude 4.4 quake was so powerful that it was felt in portions of Alabama, Georgia, South Carolina, North Carolina and Kentucky. Significant shaking was even felt as far away as Atlanta, and that was highly unusual. The original earthquake was rapidly followed by a magnitude 3.0 aftershock, and subsequently there were several other noteworthy aftershocks.
We live at a time when earthquakes are increasing in size and frequency, and many are concerned about what this may mean for our future. The recent earthquakes in Alaska were a shock, but at least they made sense since much of the coastline of Alaska sits directly along the Ring of Fire. But eastern Tennessee is not an area that has traditionally been prone to quakes. Could it be possible that the seismic scar that was created when the North American continent was formed is beginning to reawaken?
Prior to Wednesday, the last time that eastern Tennessee had experienced an earthquake of this magnitude or greater was on November 30th, 1973.
That was 45 years ago, and many of you that will be reading this article were not even alive at that time.
Some experts had regarded eastern Tennessee as one of the safest areas in the eastern half of the country, but after what we just witnessed they may want to reevaluate things. When the earthquake happened, the shaking was so violent that it actually woke people from their sleep all the way over in neighboring North Carolina
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(Excerpt) Read more at endoftheamericandream.com ...
I am originally from Michigan where we always got lots of snow - like sometimes six foot drifts at the front door. But, the first year I experienced Black Ice I was in Dallas. It was in 1978 or so. Everything had up to a 1/2 inch of ice on it, roads, bushes, trees. Since there was ice everywhere I put on my snowmobile suit and my skates and I skated in the middle of the road because there was no traffic. I was doing pretty good and people would open their doors and yell out at me, like cheering me on. Until I came up to one of my neighbors who had thrown sand down his driveway and into the street. That is the only time I fell. What a noob and I told him that. I have not worn my snowmobile suit since.
I’d prefer to see the San Andreas go apocalypse on them; would almost be a blessing.
Earthquakes, bah. Cayce Earth Changes, wake me up for one of those. :^)
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No worries. This quake relieved some pressure off the New Madrid fault.
5.56mm
All along the Appalachians. Is this what they mean when they say, "the South shall rise again"?
Hate earthquakes
Eastern
I first learned about earthquake rods in Charleston. They were likely built into or added to buildings after the 1883 quake. Here is a picture of earthquake rods in an old Texas church: Link
We get earthquakes occasionally here in New York City.
More importantly, is Graceland ok?
He points to the large circle and says " This is the sun. A giant nuclear reactor in space."
He then points to the small circle and says " This is the earth, a cooling planet floating in the frozen vacuum of space and is subject to all the forces of the surrounding planets and space debris. So never be surprised by changes that can take place on this little cooling ball in space."
If New Madrid rips then the insurance policy is probably worthless. The damage will cause a major financial disruption on top of the physical damage.
I was up during that one. It was like between 3 and 4 in the morning.
Western Tennessee is right in the heart of the New Madrid fault and subject to major earthquakes to the point that homeowners have to have earthquake insurance riders on their policy. The most severe earthquake known in the lower 48 hit there in the 18 teens and caused little damage since the area was not settled much.
If you believe I am serious you are as dumb as that post.
The resulting rift system failed to split the continent, but has remained as an aulacogen (a scar or zone of weakness) deep underground, and its ancient faults appear to have made the Earths crust in the New Madrid area mechanically weaker than much of the rest of North America.
This relative weakness is important, because it would allow the relatively small east-west compressive forces associated with the continuing continental drift of the North American plate to reactivate old faults around New Madrid, making the area unusually prone to earthquakes in spite of it being far from the nearest tectonic plate boundary.[16]
Since other ancient rifts are known to occur in North America but not all are associated with modern earthquakes, other processes could be at work to locally increase mechanical stress on the New Madrid faults.[17][18]
It has also been suggested that some form of heating in the lithosphere below the area may be making deep rocks more plastic, which would concentrate compressive stress in the shallower subsurface area where the faulting occurs.[19][20]
Earthquakes in the New Madrid and Wabash Valley seismic zones
Potential for future earthquakes:
In a report filed in November 2008, the U.S. Federal Emergency Management Agency warned that a serious earthquake in the New Madrid Seismic Zone could result in the highest economic losses due to a natural disaster in the United States, further predicting widespread and catastrophic damage across Alabama, Arkansas, Illinois, Indiana, Kansas, Kentucky, Mississippi, Missouri, Oklahoma, Texas, and particularly Tennessee, where a 7.7 magnitude quake would cause damage to tens of thousands of structures affecting water distribution, transportation systems, and other vital infrastructure.[21]
The earthquake is expected to also result in many thousands of fatalities, with more than 4,000 of the fatalities expected in Memphis alone.
The potential for the recurrence of large earthquakes and their impact today on densely populated cities in and around the seismic zone has generated much research devoted to understanding in the New Madrid Seismic Zone.
By studying evidence of past quakes and closely monitoring ground motion and current earthquake activity, scientists attempt to understand their causes and recurrence intervals.
In October 2009, a team composed of University of Illinois and Virginia Tech researchers headed by Amr S. Elnashai, funded by the Federal Emergency Management Agency (FEMA), considered a scenario where all three segments of the New Madrid fault ruptured simultaneously with a total earthquake magnitude of 7.7.
The report found that there would be significant damage in the eight states studied Alabama, Arkansas, Illinois, Indiana, Kentucky, Mississippi, Missouri, and Tennessee with the probability of additional damage in states farther from the NMSZ.
Tennessee, Arkansas, and Missouri would be most severely impacted, and the cities of Memphis, Tennessee, and St. Louis, Missouri, would be severely damaged. The report estimated 86,000 casualties, including 3,500 fatalities, 715,000 damaged buildings, and 7.2 million people displaced, with two million of those seeking shelter, primarily due to the lack of utility services. Direct economic losses, according to the report, would be at least $300 billion.[22]
That seems pretty rational. :^)
If Cthulu comes out of a rift, Ill be sure to wake you up. :)
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