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Using innovative and sophisticated technology, scientists now have high-resolution imagery of the New Madrid Seismic Zone, allowing them to map the area in more detail than ever before. The maps allow for greater understanding of the weak rocks in this zone that are found at further depths in the Earth’s mantle compared to surrounding areas. Scientists also determined that earthquakes and their impacts are likely to be narrowly concentrated in this zone.
“With the new high-resolution imagery, we can see in greater detail that the New Madrid Seismic Zone is mechanically weaker than surrounding areas and therefore concentrates movement and stress in a narrow area,” said USGS scientist Fred Pollitz, who is the lead author of this research. “The structure beneath this zone is unique when compared to adjacent areas in the central and eastern United States. A more in-depth understanding of such zones of weakness ultimately helps inform decisions such as the adoption of appropriate building codes to protect vulnerable communities, while also providing insight that could be applied to other regions across the world.”
“Our results are unexpected and significant because they suggest that large earthquakes remain concentrated within the New Madrid Seismic Zone,” said USGS scientist Walter Mooney, the co-author of the report. “There are still many unknowns about this zone, and future research will aim to understand why the seismic zone is active now, why its earthquake history may be episodic over millions of years, and how often it produces large quakes.”
Phage
reply to post by k21968
What seems to be new is a better understanding of how the fault works.
I don't really see anything thing there that indicates that any activity may be imminent. Nothing that say it isn't either.
Does that help?
ProfessorChaos
Here on the east coast, we've been awaiting a mega tsunami for more than a decade now.
I wouldn't go losing sleep over this report.
Not quite that. More, "there is a good chance that it will happen at some time and we have no way of knowing when"
What I get from it is, "we do not know when" but it will happen.
Phage
reply to post by k21968
What they are saying is that new technology has provided information which was never before available and that information indicates that the fault is not dead.
Not quite that. More, "there is a good chance that it will happen at some time and we have no way of knowing when"
What I get from it is, "we do not know when" but it will happen.
Scary, yes. But people on the west coast have been living with a very unequivocal "it is not a matter of if" for a very long time. For you there seems to still be a bit of "if".
edit on 9/30/2013 by Phage because: (no reason given)
k21968
reply to post by Phage
SO basically they are saying that their data is showing the fault is more accurate than they believed, so what does that mean for us and why did he not say what it really meant???
I mean he could say move now, save yourself, or relax it wont happen in your life. What I get from it is, "we do not know when" but it will happen. That is pretty scary.
Approximately 2.6 million households are without power after the earthquake. Nearly 86,000 injuries and fatalities result from damage to infrastructure. Nearly 130 hospitals are damaged and most are located in the impacted counties near the rupture zone. There is extensive damage and substantial travel delays in both Memphis, Tennessee, and St. Louis, Missouri, thus hampering search and rescue as well as evacuation. Moreover roughly 15 major bridges are unusable.
Three days after the earthquake, 7.2 million people are still displaced and 2 million people seek temporary shelter. Direct economic losses for the eight states total nearly $300 billion, while indirect losses may be at least twice this amount.
The contents of this report provide the various assumptions used to arrive at the impact estimates, detailed background on the above quantitative consequences, and a breakdown of the figures per sector at the FEMA region and state levels. The information is presented in a manner suitable for personnel and agencies responsible for establishing response plans based on likely impacts of plausible earthquakes in the central USA.
The earthquake of 1811/1812 created reelfoot lake, the only non man made lakes in TN (where I live currently).