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One specific form of runaway subduction is called "catastrophic plate tectonics", proposed by geophysicist John Baumgardner and supported by the Institute for Creation Research and Answers in Genesis. This holds the rapid plunge of former oceanic plates into the mantle caused by an unknown trigger mechanism which increased local mantle pressures to the point that its viscosity dropped several magnitudes according to known properties of mantle silicates. Once initiated, sinking plates caused the spread of low viscosity throughout the mantle resulting in runaway mantle convection and catastrophic tectonic motion as continents were dragged across the surface of the earth. Once the former ocean plates, which are thought to be denser than the mantle, reached the bottom of the mantle an equilibrium was reached. Pressures dropped, viscosity increased, runaway mantle convection stopped, leaving the surface of the earth rearranged. Proponents point to subducted slabs in the mantle which are still relatively cool, which they regard as evidence that they have not been there for millions of years of temperature equilibration. Catastrophic plate tectonics is also associated with the creationist hypothesis that the Earth's magnetic field reversed direction many times in rapid succession during the year-long global flood.
Baumgardner has a Ph.D. in geophysics and space science from the University of California at Los Angeles and works at the Los Alamos National Laboratory, is Adjunct Professor of Geophysics at the Institute for Creation Research. He is a member of the Intelligent Design and Evolution Awareness Center.
He became a Christian at 26 and has tried to prove the Noachian flood scientifically ever since, creating a computer program called Terra to model the flood. In 1985, Baumgardner joined the controversial amateur archaeologist Ron Wyatt and salvage expert David Fasold to Durupınar, Turkey for an expedition recounted in Fasold's The Ark of Noah to locate the biblical ship's remains. Baumgardner did not support Wyatt and Fasold claims to have found a boat-shaped 'object' which was the Ark. He argued that the object was a natural formation.
Originally posted by Mkoll
reply to post by angelchemuel
If that's true I would imagine that the increased amount of water over the tectonic plates would change pressure and exert force in slightly new ways which would probably effect seismic activity in a way. And it would follow that an increase in sea level worldwide would effect seismic activity worldwide in some way.