Distribution of the Pacific/North America motion in the Queen Charlotte Islands-S. Alaska plate boundary zone

Details Distribution of the Pacific/North America motion in the Queen Charlotte Islands-S. Alaska plate boundary zone Distribution of the Pacific/North America motion in the Queen Charlotte Islands-S. Alaska plate boundary zone

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30nsde7m&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 14, pp. SDE 7-1, CiteID 1762, DOI 10.1029/2003GL017586

Physics

5

Geodesy And Gravity: Crustal Movements-Interplate (8155), Geodesy And Gravity: Crustal Movements-Intraplate (8110), Geodesy And Gravity: Seismic Deformations (7205), Tectonophysics: Earth'S Interior-Composition And State (1212), Tectonophysics: Plate Boundary-General (3040)

Scientific paper

We present GPS data that constrain the distribution of the relative Pacific/North America motion across the Queen Charlotte Islands-Alaska Panhandle margin (NW North America). Velocities from a network of 22 campaign and permanent sites indicate that the Pacific/North America transpressive motion is mostly accommodated along the locked Queen Charlotte-Fairweather Fault. A significant portion (6-7 mm/yr) of the relative plate motion is taken up by distributed dextral shear across a ~200 km wide region of the margin. Two models have been proposed to describe how the Pacific/North America convergence is accommodated off the Queen Charlotte Islands: Internal shortening vs. underthrusting of the Pacific plate. Although the GPS data cannot discriminate between the models, they provide strong constraints on the convergence distribution. The significant non-transient motion of GPS sites along the central British Columbia-southern Alaska margin has implications for seismic hazard and tectonic evolution models of the Canadian Cordillera.

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