Hill, Emma M. and Davis, James L. and Elósegui, Pedro and Wernicke, Brian P. and Malikowski, Eric and Niemi, Nathan A. (2009) Characterization of site-specific GPS errors using a short-baseline network of braced monuments at Yucca Mountain, southern Nevada. Journal of Geophysical Research B, 114 . Art. No. B11402. ISSN 0148-0227 http://resolver.caltech.edu/CaltechAUTHORS:20091125-094838297
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We use a short-baseline network of braced monuments to investigate site-specific GPS effects. The network has baseline lengths of ∼10, 100, and 1000 m. Baseline time series have root mean square (RMS) residuals, about a model for the seasonal cycle, of 0.05–0.24 mm for the horizontal components and 0.20–0.72 mm for the radial. Seasonal cycles occur, with amplitudes of 0.04–0.60 mm, even for the horizontal components and even for the shortest baselines. For many time series these lag seasonal cycles in local temperature measurements by 23–43 days. This could suggest that they are related to bedrock thermal expansion. Both shorter-period signals and seasonal cycles for shorter baselines to REP2, the one short-braced monument in our network, are correlated with temperature, with no lag time. Differences between REP2 and the other stations, which are deep-braced, should reflect processes occurring in the upper few meters of the ground. These correlations may be related to thermal expansion of these upper ground layers, and/or thermal expansion of the monuments themselves. Even over these short distances we see a systematic increase in RMS values with increasing baseline length. This, and the low RMS levels, suggests that site-specific effects are unlikely to be the limiting factor in the use of similar GPS sites for geophysical investigations.
|Additional Information:||© 2009 American Geophysical Union. Received 21 August 2008; accepted 4 August 2009; published 5 November 2009. This work was funded by the U.S. Department of Energy, and NSF grants EAR-0346147, EAR-0135457, EAR- 0809195, and EAR-0810328. UNAVCO, Inc. supports BARGEN site operation and maintenance. Bob King (MIT) was, as always, extremely gracious with his assistance and advice regarding the GAMIT software. We are also grateful to Jeff Behr (Orion Monitoring Systems, Inc.) for providing technical assistance and detailed station information from the field and to two anonymous reviewers whose insightful comments significantly improved the quality of this manuscript.|
|Subject Keywords:||GPS; geodesy; monuments|
|Official Citation:||Hill, E. M., J. L. Davis, P. Elósegui, B. P. Wernicke, E. Malikowski, and N. A. Niemi (2009), Characterization of site-specific GPS errors using a short-baseline network of braced monuments at Yucca Mountain, southern Nevada, J. Geophys. Res., 114, B11402, doi:10.1029/2008JB006027.|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Tony Diaz|
|Deposited On:||05 Jan 2010 18:44|
|Last Modified:||26 Dec 2012 11:35|
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