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Old 03-04-2012, 05:13 PM
 
1,331 posts, read 2,324,576 times
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"Deep angles along San Andreas mean temblors may be stronger than predicted

A new twist on the San Andreas fault could shake up Southern Californians preparing for the Big One.

The southern San Andreas isn’t vertical in most places, as previously thought. Instead, it twists in opposite directions along its length, a new study finds, meaning a rupture might shake some places harder than current forecasts predict.

“We now have a picture of a propeller-shaped San Andreas,” says Gary Fuis, a geophysicist at the U.S. Geological Survey in Menlo Park, Calif. Fuis and his colleagues report the new findings in the February Bulletin of the Seismological Society of America.

This shape could make the San Andreas — parts of which have been locked and building up strain as the Pacific and North American plates try to slide past each other — even more hazardous."

More at:
Fault’s twists may shake up earthquake forecasts

Last edited by bradleyyo; 03-04-2012 at 05:28 PM..
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Old 03-05-2012, 10:45 AM
 
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The fault formed as part of the East Pacific Rise was subducted by the then unified Cascadia / Andean subduction zone. The meant that even after the fault formed, the original compressive component remained, albeit now oblique rather than normal. In the North, this manifested as obduction, whereby the outer coast range is riding over the North American Plate. In the South, due to the left turn the Pacific plate had to take to clear the Sierra mountain root, a petite subduction resumed, albeit with the series of nested "trenches" on land instead of at sea, and in an E-W orientation instead of a N-S one. This manifested as the several thrust faults now active. Over time, the San Andreas proper also began something similar, along a NW- SW axis. At some point outright subduction may fully resume.
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