Strain accumulation along the Cascadia subduction zone
Geophysical Research Letters
By: M.H. Murray and M. Lisowski
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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.
Suggested Citation
Murray, M., Lisowski, M., 2000, Strain accumulation along the Cascadia subduction zone: Geophysical Research Letters, v. 27, no. 22, p. 3631-3634, https://doi.org/10.1029/1999GL011127.
| 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 |
| Publication Date | November 15, 2000 |
| 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 |