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THE HIGHEST EARTHQUAKE RISK in the UNITED STATES outside the West Coast is along the New Madrid Fault. Damaging tremors are not as frequent as in California, but when they occur, the destruction covers over more than 20 times the area because of underlying geology.
A DAMAGING EARTHQUAKE in this AREA, 6.0 or greater, occur about every 80 years (the last one in 1895). The results would cause serious damage to schools and masonry buildings from Memphis to St Louis.
A MAJOR EARTHQUAKE in this AREA, 7.5 or greater, happens every 200- 300 years (the last one in 1812). There is a 25% chance by 2040. A New Madrid Fault rupture this size would be felt throughout half the United States and damage 20 states or more. Missouri alone could anticipate losses of at least $6 billion from such an event.
THE GREAT NEW MADRID EARTHQUAKE OF 1811-1812 was actually a series of over 2000 shocks in five months, five of which were 8.0 or more in magnitude. Eighteen of these rang church bells on the Eastern seaboard. The very land itself was destroyed in the Missouri Bootheel, making it unfit even for farmers for many years. It was the largest burst of seismic energy east of the Rocky Mountains in the history of the United States and was several times larger than the San Francisco quake of 1905.
Originally posted by everlastingnoitall
Assuming your epicenters are where the stars are, in your maps, I would have to say this is not activity along the New Madrid Fault
A micro earthquake occurred at 05:06:43 (UTC) on Saturday, August 28, 2004. The magnitude 2.8 event has been located in ALABAMA. (This event has been reviewed by a seismologist.)
Originally posted by Murcielago
quakes happen, big deal, not worth a thread.
Also, you can always go rattling on and on about another ones coming, NO #, earthqaukes have always happened on this planet, and always will.
Originally posted by everlastingnoitall ... but along the southern edge of the Appalachian range, which would be the continental divide between the plates.
It may be due to displacement between the plates as their movement becomes more up/down than pushing together.
Originally posted by everlastingnoitallPerhaps this is an early indication of the region of the Appalachians becoming more active? Anyone know of any ancient volcanic activity along this range that could be stirring again? Of course, the New Madrid Fault formed when teh continent tried to tear itself apart, maybe this is a new shift in tectonic activity on the North American Plate itself?
"We have events like this about every 10 to 20 years. So far they have not been serious. There's potential for a larger event," Long said.
"It was felt widely. These earthquakes in this area are typically deeper focus. That is they're down 20 to 30 kilometers in the Earth's crust. So they're felt over a wide area but not as strongly as some other types of earthquakes."
Long said the building code isn't as strict in the Southeast as it is on the West Coast. He said there was not a statutory mandate to build to code until about 10 or 15 years ago, but that buildings constructed since then should be safe.
John Bellini, a U.S. Geological Survey geophysicist, said: "We would expect items knocked from the shelves, pictures knocked off the walls, people waking up. We wouldn't expect any casualties.
"In California, you get something like this once every month. In the East, it's relatively uncommon but not unheard of."
The largest earthquake in Alabama occurred north of Birmingham in October 1916. It registered a magnitude of 5.1. Georgia's largest earthquake was also in 1916, about 30 miles southeast of Atlanta. It registered a magnitude of 4.1.
Originally posted by BlackJackal
Again I will repeat. Earthquakes are not common in Alabama.
> I am interested in the recent earthquakes that are occuring in Alabama.
> There have been atleast 4 minor tremors since May 2004 and the most recent
> occuring August 28 2004.
> What do these quakes indicate? What Fault line are they occuring on?
> Could this be an indication that a large earthquake could occur in this
> area at some point within the next one to two years?
> Thank you in advance.
We donít exactly know why there are earthquakes in this area, nor do we know what to expect. Siesmology is still a young science, and there are still a lot of questions that remain unanswered.
USGS Earthquake Hazards Program