Computer Science – Sound
Scientific paper
Apr 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002e%26psl.198...41m&link_type=abstract
Earth and Planetary Science Letters, Volume 198, Issue 1-2, p. 41-48.
Computer Science
Sound
16
Scientific paper
We estimate the rate of crustal deformation in the central and northern Cascadia forearc based on a combination of existing global positioning system (GPS) velocity data along the Cascadia subduction zone. GPS strain rates and velocities show that the northwestern Washington-southwestern British Columbia region is currently shortening at 3-3.5 mm yr-1 in a N-S direction, in good agreement with inference from crustal earthquake statistics. On the long-term, the shortening rate is 5-6 mm yr-1, providing that the subduction-related interseismic loading of the margin is purely elastic. Compared to the velocity of the Oregon forearc with respect to North America (~7 mm yr-1), this indicates that most of the forearc motion is accommodated in the Puget-Georgia basin area, corresponding to the main concentration of crustal seismicity. The difference between the current and long-term shortening rates may be taken up during subduction megathrust earthquakes. Thus, these events could produce a sudden increase of N-S compression in the Puget sound region and could trigger major Seattle-fault-type crustal earthquakes.
Dragert Herb
Henton Joseph A.
Hyndman Roy D.
Mazzotti Stéphane
Miller Maynard M.
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