Using 1-Hz GPS Data to Measure Deformations Caused by the Denali Fault Earthquake
- 30 May 2003
- journal article
- other
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 300 (5624) , 1421-1424
- https://doi.org/10.1126/science.1084531
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 ∼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 seismicinstruments 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.Keywords
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