Cascadia Subduction Zone: Less damage on land, bigger tsunami?
Scientists are just back from a monthlong research cruise in the Pacific Ocean off Washington state, where they were trying to find the stickiest point on a section of the Cascadia Subduction Zone , the huge undersea fault that breaks loose every few hundred years and generates a massive tsunami and earthquake.
Join the discussion below, or Read more at KVAL-TV Eugene.
“Geologist [I'm Climate Change]”
Since: Mar 07
#1 Sep 4, 2013
Currently watching that space...
Found that the last (1700AD) was apparently a 2 stage event with initial event beginning in Northern californai & trending N. with vector NW. whith largest runout in the south and petering out near vancouver island.
2nd event was WNW. vector which broke the N part of cascadia through to halfway along Vancouver Island and continued S. through Cascadia with the largest runout probably central Oregon and likely petering out at the lassen field area latitude.
The result was a pair of turbidites in the Washington area. The relaxation of the basin & range was highest in the WNW. vector in the 2nd event & relaxed the crust to the Colorado hotspot & beyond. This relaxation appears to have a lot to do with the New madrid rifts of the 1812 timespan.
Currently the highest recompression rate is in the S. part of cascadia near cape Mendocino, as a result of the slow slide of California along the nest of transform faults & rifts extending from E. of the owens valley through to the coast. The interesting thing is that this bit was not mentioned in the GPS data results!
The other interesting bit is in the far N. of cascadia @ Vancouver as the SW. vector directly opposing the NE-SW convergence of Juan de Fuca & Explorer plates with North America has not run out via a megathrust quake yet.
Would like to see the results of the survey.
Have a nice day: Ag
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