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Originally posted by Red Cloak
First, understand that the New Madrid is actually a subduction zone, as there is another plate boundary under there...
The New Madrid Seismic Zone is made up of reactivated faults that formed when what is now North America began to split or rift apart during the breakup of the supercontinent Rodinia in the Neoproterozoic Era (about 750 million years ago). Faults were created along the rift and igneous rocks formed from magma that was being pushed towards the surface. The resulting rift system failed but has remained as an aulacogen (a scar or zone of weakness) deep underground. Another unsuccessful attempt at rifting 200 million years ago created additional faults, which made the area weaker. The resulting geological structures make up the Reelfoot Rift, and have since been deeply buried by younger sediments. But the ancient faults appear to have made the rocks deep in the Earth's crust in the New Madrid area mechanically weaker than much of the rest of North America.
Originally posted by TrueAmerican
Originally posted by Red Cloak
First, understand that the New Madrid is actually a subduction zone, as there is another plate boundary under there...
Ding Ding Ding!!!! Fail.
A subduction zone is where one continental plate slides underneath another. Not where a rift is formed from a supercontinent pulling apart, which is case on the NMSZ.
The New Madrid Seismic Zone is made up of reactivated faults that formed when what is now North America began to split or rift apart during the breakup of the supercontinent Rodinia in the Neoproterozoic Era (about 750 million years ago). Faults were created along the rift and igneous rocks formed from magma that was being pushed towards the surface. The resulting rift system failed but has remained as an aulacogen (a scar or zone of weakness) deep underground. Another unsuccessful attempt at rifting 200 million years ago created additional faults, which made the area weaker. The resulting geological structures make up the Reelfoot Rift, and have since been deeply buried by younger sediments. But the ancient faults appear to have made the rocks deep in the Earth's crust in the New Madrid area mechanically weaker than much of the rest of North America.
en.wikipedia.org...
I shall not bother with the rest.
Originally posted by Red Cloak
Originally posted by TrueAmerican
Originally posted by Red Cloak
First, understand that the New Madrid is actually a subduction zone, as there is another plate boundary under there...
Ding Ding Ding!!!! Fail.
A subduction zone is where one continental plate slides underneath another. Not where a rift is formed from a supercontinent pulling apart, which is case on the NMSZ.
The New Madrid Seismic Zone is made up of reactivated faults that formed when what is now North America began to split or rift apart during the breakup of the supercontinent Rodinia in the Neoproterozoic Era (about 750 million years ago). Faults were created along the rift and igneous rocks formed from magma that was being pushed towards the surface. The resulting rift system failed but has remained as an aulacogen (a scar or zone of weakness) deep underground. Another unsuccessful attempt at rifting 200 million years ago created additional faults, which made the area weaker. The resulting geological structures make up the Reelfoot Rift, and have since been deeply buried by younger sediments. But the ancient faults appear to have made the rocks deep in the Earth's crust in the New Madrid area mechanically weaker than much of the rest of North America.
en.wikipedia.org...
I shall not bother with the rest.
New Madrid is a subduction zone. None of that "official" info that claims it is just a slip fault is correct.edit on 4-5-2011 by Red Cloak because: (no reason given)
When a high-magnitude earthquake has been predicted, Terramoto's method calls for explosives to be drilled into the rock to create a series of controlled explosions that will weaken the rock and let the energy accumulated over the years be released gradually in a number of small quakes, rather than one devastating one.
New Madrid is a subduction zone. None of that "official" info that claims it is just a slip fault is correct.edit on 4-5-2011 by Red Cloak because: (no reason given)