By Seth Stein
Published by way of the yank Geophysical Union as a part of the Geodynamics sequence, quantity 30.
An vital switch in principles approximately plate tectonics has been the popularity that the bounds among plates are frequently huge zones of deformation, instead of the slim obstacles initially assumed in plate tectonic thought. for that reason, even though it was once universal to straddle the San Andreas fault and consider one leg as being at the Pacific plate and the opposite in North the USA, it's now well-known that any such straddle will require a 1500-km leg span around the plate boundary sector extending throughout a lot of western North America.
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