CompuServe Messages

#Subduction & Ocean Basin

    21-Feb-95 21:03:28
Fm: David Rosen 72560,3620
To: Kamron Kirkconnell 73740,2246
I think one problem you have is with scaling laws . For objects the size we are talking about, the shear forces of the solid exist but are small compared to the gravitational forces and convective forces (proportional to the small temperature gradient) in these objects. That is why you can't build somet a house the size of the empire state building out of stone. It would break apart, crack, etc., but it's fall would probably be vaguely liquid like. For a approximate mathematical model of the process, plus direct GPS evidence of tectonic movement in Iceland, get a copy of the thesis: A Study of Crustal Deformation in Iceland Using Boundry Element Modeling and the Global Positioning System by Mary Christine Hackman, University of Colorado (1991) (PhD thesis). I don't know where to get more convincing evidence of oceanic subduction. By the way, is the point you are making that one can NEVER trust indirect measurements because interpretation requires assumptions? Son of Sam hears voices in his head telling him to kill people. I don't think he lied. Voices in head are a direct measurement. The police use indirect, forensic science. Do I have to believe Son of Sam? Please state the type of evidence that YOU would find compelling. Maybe it's out there, maybe it's not, but then we could develope a real argument.