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Crustal loading near Great Salt Lake, Utah

Elósegui, P. and Davis, J. L. and Mitrovica, J. X. and Bennett, R. A. and Wernicke, B. P. (2003) Crustal loading near Great Salt Lake, Utah. Geophysical Research Letters, 30 (3). Art. No. 1111. ISSN 0094-8276. doi:10.1029/2002GL016579.

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Two sites of the BARGEN GPS network are located ∼30 km south of Great Salt Lake (GSL). Lake-level records since mid-1996 indicate seasonal water elevation variations of ∼0.3 m amplitude superimposed on a roughly “decadal” feature of amplitude ∼0.6 m. Using an elastic Green's function and a simplified load geometry for GSL, we calculate that these variations translate into radial crustal loading signals of ±0.5 mm (seasonal) and ±1 mm (decadal). The horizontal loading signals are a factor of ∼2 smaller. Despite the small size of the expected loading signals, we conclude that we can observe them using GPS time series for the coordinates of these two sites. The observed amplitudes of the variations agree with the predicted decadal variations to <0.5 mm. The observed annual variations, however, disagree; this difference may be caused by some combination of local precipitation-induced site motion, unmodeled loading from other nearby sources, errors in the GSL model, and atmospheric errors.

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Wernicke, B. P.0000-0002-7659-8358
Additional Information:© 2003 American Geophysical Union. Received 7 November 2002; revised 4 December 2002; accepted 23 December 2002; published 5 February 2003. We thank C. Burden of the U.S.G.S. for providing lake-gauge data. J. Normandeau of SAO performed the preliminary GPS data analysis. BARGEN was installed and is maintained with the assistance of the UNAVCO Facility. We thank B. Bills and an anonymous reviewer for helpful comments on the manuscript. (B. Bills provided information regarding mining activities.) This research was supported by NSF grants EAR-9725766 and EAR-0135457, NASA grants NAG5-11629 and NAG5-8226, USGS grant 99HQGR0212, the California Institute of Technology, and the Smithsonian Institution.
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Official Citation:Elósegui, P., J. L. Davis, J. X. Mitrovica, R. A. Bennett, and B. P. Wernicke (2003), Crustal loading near Great Salt Lake, Utah, Geophys. Res. Lett., 30, 1111, doi:10.1029/2002GL016579, 3.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:47395
Deposited On:22 Jul 2014 22:21
Last Modified:10 Nov 2021 17:39

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