When plate boundary stresses build up to a critical level, you get a local rupturing (fracturing) of the crust. What is that critical level?? Just like climate change and many other elements of nature that are too complex to fully understand, it depends on numerous things, like the type of rock and the direction of stress/forces. A given type of rock could have a considerably different shear strength along grain boundaries than perpendicular to them... one can see that without a very good 3D understanding of the crustal rocks along the entire length of a fault zone, and probably at least 10s of miles on either side of the fault, and 20 kilometers deep, it would be very difficult to accurately predict EQs from purely geophysical data. OTOH, I have an EE friend who monitors ELF geomagnetics, and he has successfully predicted two quakes while we were sitting in the kitchen chatting and watching the HP Dynamic Signal Analyzer... geomagnetics preceeding eqs usually manifest in the 1 to 10 Hz region.
-Mark _____ From: David Jonsson [mailto:davidjonssonswe...@gmail.com] Sent: Saturday, December 20, 2008 9:53 AM To: vortex-l@eskimo.com Subject: [Vo]:Solid compression - high controversy Hi On Tuesday Sweden had its greatest earthquake in a century. Nothing was damaged but it was still noticeable. It was a 4.7 Richter quake. Working with earthquakes is an important thing. Strong quakes can be very destructive. I can not see how traditional seismology is correct in explaining quakes. Most quakes seems to have a point origin. Plate tectonic stress do not cause points of increased stress but rather in large continuous areas or at the most in large surfaces or lines. Not in points. Further observations from space show a local change in elevation of the ground around the quake and there is also something going on in space above the epicenter prior to the quake. This implies a very local (compared to plate tectonic scale) cause of the quake. The only stress release which could cause a point wise collapse or breakdown is a point wise expansion or retraction which in turn would cause or be caused by a temperature increase or decrease which would require enormous energies to be removed or added to the point in the crust. Any process except heating seems unlikely to cause the expansion. These energies have to come from the interior, which has a lot of thermal energy, or from space, which seems rather void. Maybe the space effects alter the thermal conduction in the crust. Best regards, David David Jonsson Sweden phone callto:+46703000370 No virus found in this incoming message. Checked by AVG. Version: 7.5.552 / Virus Database: 270.9.19/1857 - Release Date: 12/19/2008 10:09 AM No virus found in this outgoing message. Checked by AVG. Version: 7.5.552 / Virus Database: 270.9.19/1857 - Release Date: 12/19/2008 10:09 AM
