New constraints on the motion of the Fairweather fault, Alaska, from GPS observations

Details New constraints on the motion of the Fairweather fault, Alaska, from GPS observations New constraints on the motion of the Fairweather fault, Alaska, from GPS observations

Feb 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30c..39f&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 3, pp. 39-1, CiteID 1139, DOI 10.1029/2002GL016476

Physics

10

Tectonophysics: Plate Boundary-General (3040), Seismology: Seismic Hazard Assessment And Prediction, Tectonophysics: Plate Motions-Present And Recent (3040), Tectonophysics: Continental Neotectonics, Tectonophysics: General Or Miscellaneous

Scientific paper

GPS velocities from sites near to the Fairweather fault in southern Alaska are combined with line length data from geodetic surveys by the U. S. Geological Survey (USGS) to estimate the slip rate and locking depth of the Fairweather fault using dislocation theory. We perform a weighted least-squares inversion of the geodetic data and obtain a best-fitting slip rate of 45.6 +/- 2.0 mm/yr and locking depth of 9.0 +/- 0.8 km. The slip rate we estimate is one of the highest observed across any strike slip fault. We also include the Dalton Creek segment of the Denali fault in our model and estimate a slip rate of 3.8 +/- 1.4 mm/yr for this section of the fault. This is substantially lower than the rate observed for the Denali fault segment to the northwest, which ruptured in the November 3, 2002 MW 7.9 Denali fault earthquake.

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