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Gravity Janice Kukuk Rob Ghigieri Ross Whitmore http://sciencefun.wordpress.com/2008/04/
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Takehome Message Bolstered NE portion of the Truckee Meadows Basin (TMB) Gravity dataset Hidden Valley Sub-basin
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Purpose Learn how to use a Gravimeter Fill data gaps in TMB dataset Profile a smaller sub-basin in Hidden Valley
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Location
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Methods LaCost and Rhomberg Gravimeter Grav2d GM-SYS Trimble GPS Theodolite
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Results for Prater ~14 mGal anomaly WEWE Distance in km Grav2d GM-SYS
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Results for Hidden Valley Tolerance 2 mGal Density contrast-0.33 g/cc -6 mGal Anomaly WEWE Grav2d GM-SYS Distance in km
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Comparison of results Prater (Modified from Widmer et al., 2007) WEWE
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Comparison of results Hidden Valley WEWE
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Error Non-equilibrated spring Terrain corrections Elevation error Inconsistent temperature User error Instrument drift
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Future Work Verification of Hidden Valley anomaly Completion of D’Andrea pkwy line to bolster dataset
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Takehome Message Bolstered NE portion of the Truckee Meadows Basin (TMB) Gravity dataset Hidden Valley Sub-basin
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References Abbot, R.E., and Louie, J.N., 2000, Depth to bedrock using gravimetry in the Reno and Carson City, Nevada, Area basins: Geophysics, V. 65, p. 430-450. Anderson, J., Su, F., Zeng, Y., 1999, Seismic Hazards in the vicinity of Las Vegas and Reno: Final Technical Report GS# 1434-HQ-97- GR-03044 (paper copy, 15 p.) Telford, W.M., Geldhart, L.P., and Sheriff, R.E., 1990, Applied Geophysics: New York, Cambridge University Press, 770 p. Widmer, M.C., Cashman, P.H., Benedict, F.C., Trexler, J.H., 2007, Neogene through Quaternary stratigraphy and structure in a portion of the Truckee Meadows Basin; a record of recent tectonic history: Geological Society of America Abstracts with programs, v. 39, no. 4 p.9
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