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Gravity Analysis in the Truckee Meadows Basin and Hidden Valley Sub-basin

This study enhances the NE portion of the Truckee Meadows Basin gravity dataset by employing gravimetry to fill data gaps and analyze the Hidden Valley sub-basin. Utilizing tools such as the LaCost and Rhomberg gravimeters, Grav2D, GM-SYS, and Trimble GPS, we identified key gravity anomalies, including a ~14 mGal anomaly in Prater and a -6 mGal anomaly in Hidden Valley. The research addresses various error factors, outlines future work for verifying findings, and emphasizes the necessity of completing regional infrastructure for data integrity.

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Gravity Analysis in the Truckee Meadows Basin and Hidden Valley Sub-basin

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  1. Gravity Janice Kukuk Rob Ghigieri Ross Whitmore http://sciencefun.wordpress.com/2008/04/

  2. Takehome Message • Bolstered NE portion of the Truckee Meadows Basin (TMB) Gravity dataset • Hidden Valley Sub-basin

  3. Purpose • Learn how to use a Gravimeter • Fill data gaps in TMB dataset • Profile a smaller sub-basin in Hidden Valley

  4. Location

  5. Methods • LaCost and Rhomberg Gravimeter • Grav2d • GM-SYS • Trimble GPS • Theodolite

  6. Results for Prater Grav2d W E GM-SYS ~14 mGal anomaly Distance in km

  7. Results for Hidden Valley Grav2d W E Tolerance 2 mGal Density contrast-0.33 g/cc GM-SYS -6 mGal Anomaly Distance in km

  8. Comparison of results Prater W E (Modified from Widmer et al., 2007)

  9. Comparison of results Hidden Valley W E

  10. Error • Non-equilibrated spring • Terrain corrections • Elevation error • Inconsistent temperature • User error • Instrument drift

  11. Future Work • Verification of Hidden Valley anomaly • Completion of D’Andreapkwy line to bolster dataset

  12. TakehomeMessage • Bolstered NE portion of the Truckee Meadows Basin (TMB) Gravity dataset • Hidden Valley Sub-basin

  13. 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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