Strain accumulation along the Cascadia subduction zone

Details Strain accumulation along the Cascadia subduction zone Strain accumulation along the Cascadia subduction zone

Nov 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000georl..27.3631m&link_type=abstract

Geophysical Research Letters, Volume 27, Issue 22, p. 3631-3634

Physics

13

Geodesy And Gravity: Crustal Movements-Interplate, Geodesy And Gravity: Space Geodetic Surveys, Seismology: Seismic Hazard Assessment And Prediction, Tectonophysics: Plate Boundary-General

Scientific paper

We combine triangulation, trilateration, and GPS observations to determine horizontal strain rates along the Cascadia subduction zone from Cape Mendocino to the Strait of Juan de Fuca. Shear-strain rates are significantly greater than zero (95% confidence) in all forearc regions (26-167 nanoradians/yr), and are not significant in the arc and backarc regions. The deformation is primarily uniaxial contraction nearly parallel to Juan de Fuca-North America plate convergence (N55°-80°E). The strain rates are consistent with an elastic dislocation model for interseismic slip with a shallow 100-km wide locked zone and a deeper 75-km transition zone along the entire megathrust, except along the central Oregon coast where relatively lower strain rates are consistent with 30-40 km wide locked and transition zones.

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