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Deformation across the forearc of the Cascadia subduction zone at Cape Blanco, Oregon

Journal of Geophysical Research B: Solid Earth

By:
, , ,
DOI: 10.1029/1999JB900392

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Abstract

Over the interval 1992-1999 the U.S. Geological Survey measured the deformation of a geodetic array extending N880°E (approximate direction of plate convergence) from Cape Blanco on the Oregon coast to the volcanic arc near Newberry Crater (55 and 350 km, respectively, from the deformation front). Within about 150 km from the deformation front, the forearc is being compressed arcward (N80°E) by coupling to the subducting Juan de Fuca plate. Dislocation modeling of the observed N80°E compression suggests that the main thrust zone (the locked portion of the Juan de Fuca-forearc interface) is about 40 km wide in the downdip direction. The transverse (N10°W) velocity component of the forearc measured with respect to the fixed interior of North America decreases with distance from the deformation front at a rate of about 0.03 mm yr-1 km-1. That gradient appears to be a consequence of rigid rotation of the forearc block relative to fixed interior North America (Euler vector of 43.4°±0.1° N, 120.0°±0.4° W, and -1.67±0.17° (m.y.)-1; quoted uncertainties are standard deviations). The rotation rate is similar to the paleomagnetically measured rotation rate (-1.0±0.2° (m.y.)-1) of the 15 Ma lava flows along the Columbia River 250 km farther north. The back arc does not appear to participate in this rotation but rather is migrating at a rate of about 3.6 mm yr-1northward with respect to fixed North America. That migration could be partly an artifact of an imperfect tie of our reference coordinate system to the interior of North America.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Deformation across the forearc of the Cascadia subduction zone at Cape Blanco, Oregon
Series title:
Journal of Geophysical Research B: Solid Earth
DOI:
10.1029/1999JB900392
Volume
105
Issue:
B2
Year Published:
2000
Language:
English
Publisher:
American Geophysical Union
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Journal of Geophysical Research B: Solid Earth
First page:
3095
Last page:
3102
Number of Pages:
8