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- Title
Near-Field Ground Motion of the 2002 Denali Fault, Alaska, Earthquake Recorded at Pump Station 10.
- Authors
Ellsworth, W. L.; Celebi, M.; Evans, J. R.; Jensen, E. G.; Kayen, R.; Metz, M. C.; Nyman, D. J.; Roddick, J. W.; Spudich, P.; Stephens, C. D.
- Abstract
A free-field recording of the Denali fault earthquake was obtained by the Alyeska Pipeline Service Company 3 km from the surface rupture of the Denali fault. The instrument, part of the monitoring and control system for the trans-Alaska pipeline, was located at Pump Station 10, approximately 85 km east of the epicenter. After correction for the measured instrument response, we recover a seismogram that includes a permanent displacement of 3.0 m. The recorded ground motion has relatively low peak acceleration (0.36 g) and very high peak velocity (180 cm/s). Nonlinear soil response may have reduced the peak acceleration to this 0.36 g value. Accelerations in excess of 0.1 g lasted for 10 s, with the most intense motion occurring during a 1.5-s interval when the rupture passed the site. The low acceleration and high velocity observed near the fault in this earthquake agree with observations from other recent large-magnitude earthquakes.
- Publication
Earthquake Spectra, 2004, Vol 20, Issue 3, p597
- ISSN
8755-2930
- Publication type
Article
- DOI
10.1193/1.1778172