Comments on: USGS Earthquake Scenario for Southern California http://geology.rockbandit.net/2008/05/22/usgs-earthquake-scenario-for-southern-california/ The latest and greatest news in geology, from around the world. Fri, 12 Mar 2010 17:53:28 +0000 http://wordpress.org/?v=2.9.2 hourly 1 By: Mary Petty http://geology.rockbandit.net/2008/05/22/usgs-earthquake-scenario-for-southern-california/comment-page-1/#comment-1336 Mary Petty Sat, 03 Jan 2009 08:48:03 +0000 http://geology.rockbandit.net/2008/05/22/usgs-earthquake-scenario-for-southern-california/#comment-1336 The san andreas fault from the garlock north to the oregon border is not an abutment of the Pacific plate but an abutment with the sierra batholith. and the fill that has washed off the top of the batolith. The Sierra batholith is being squeezed beween the continent and the Pacific plate and upended fromthe east side. It may not have to be tilted much more befire the western edge subducts. This senario is exatly the same as that which formed the Alps. If you will look at a drawing of the east side of the San Juaquin Valley you will see the many incidents of this tilting. also if you will look at molton lava, the pieces of the hardened and broken crust only need to tilt a small amount before they subduct, and are squeezed beween the adjoining pieces The only difference between the Sierra Batholith and molten lava is time. If this tilting could possibly be the last it could be catastrophic. More than you can imagine I truely hope I am wrong I have studied geoogy for thitry seven years and minored in geology for two and a half years in college. I am now 83 years old.and still learning. Sincerely Mary Petty The san andreas fault from the garlock north to the oregon border is not an abutment of the Pacific plate but an abutment with the sierra batholith. and the fill that has washed off the top of the batolith. The Sierra batholith is being squeezed beween the continent and the Pacific plate and upended fromthe east side. It may not have to be tilted much more befire the western edge subducts. This senario is exatly the same as that which formed the Alps.
If you will look at a drawing of the east side of the San Juaquin Valley you will see the many incidents of this tilting. also if you will look at molton lava, the pieces of the hardened and broken crust only need to tilt a small amount before they subduct, and are squeezed beween the adjoining pieces The only difference between the Sierra Batholith and molten lava is time. If this tilting could possibly be the last it could be catastrophic.
More than you can imagine I truely hope I am wrong
I have studied geoogy for thitry seven years and minored in geology for two and a half years in college. I am now 83 years old.and still learning.

Sincerely
Mary Petty

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