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Strain accumulation along the Cascadia subduction zone

Geophysical Research Letters

By:
,
DOI: 10.1029/1999GL011127

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Abstract

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.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Strain accumulation along the Cascadia subduction zone
Series title:
Geophysical Research Letters
DOI:
10.1029/1999GL011127
Volume
27
Issue:
22
Year Published:
2000
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Geophysical Research Letters
First page:
3631
Last page:
3634
Number of Pages:
4