Using 1-Hz GPS data to measure deformations caused by the Denali fault earthquake |
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Authors: | Larson Kristine M Bodin Paul Gomberg Joan |
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Institution: | Department of Aerospace Engineering Sciences, University of Colorado, Boulder, CO 80309-0429, USA. kristine.larson@colorado.edu |
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Abstract: | The 3 November 2002 moment magnitude 7.9 Denali fault earthquake generated large, permanent surface displacements in Alaska and large-amplitude surface waves throughout western North America. We find good agreement between strong ground-motion records integrated to displacement and 1-hertz Global Positioning System (GPS) position estimates collected approximately 140 kilometers from the earthquake epicenter. One-hertz GPS receivers also detected seismic surface waves 750 to 3800 kilometers from the epicenter, whereas these waves saturated many of the seismic instruments in the same region. High-frequency GPS increases the dynamic range and frequency bandwidth of ground-motion observations, providing another tool for studying earthquake processes. |
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