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By: Hamizah Hanim Hamzah, Helen Ellwood, and Zolt á n Erd ő s

Gravity. By: Hamizah Hanim Hamzah, Helen Ellwood, and Zolt á n Erd ő s. Contents. Obtaining measurements Processing data Results Interpretation. Study Area. N. Line B (4.5km). Line A (1km). Line C (4.2km). Measuring Gravity. The Lacoste-Romberg Gravity Meter.

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By: Hamizah Hanim Hamzah, Helen Ellwood, and Zolt á n Erd ő s

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  1. Gravity By: Hamizah Hanim Hamzah, Helen Ellwood, and Zoltán Erdős

  2. Contents • Obtaining measurements • Processing data • Results • Interpretation

  3. Study Area N Line B (4.5km) Line A (1km) Line C (4.2km)

  4. Measuring Gravity The Lacoste-Romberg Gravity Meter

  5. Measuring Elevations Geodimeter

  6. Processing Method Corrections needed for: • Tides • Instrument drift Due to elastic creep in springs • Differences in latitude g increases towards poles

  7. Processing Method • Height of measurement above reference datum: Free-Air Correction = +0.308 mGal/m • Extra mass between measurement and reference datum: Bouguer Correction = -0.4185ρh Where ρ=density (gm/cm3) and h = height above datum (m) • Effect of surrounding terrain

  8. NNW SSE ρ = 2 gm/cm3

  9. SW NE ρ = 2 gm/cm3

  10. SW NE ρ = 2 gm/cm3

  11. Buoguer Anomaly Map with stations colour-coded according to measured anomaly

  12. Comparison With Resistivity Results Line C anomaly has been filtered to remove long and very short wavelength variations, and compared with resistivity inversion result.

  13. A Possible Model for Line B Basement, ρ=2.67g/cm3

  14. A Possible Model for Line C

  15. Another Possibility for Line C Gravity interpretation is non-unique

  16. Geological and Topographic Map of Region

  17. Summary • 3 lines: A – Oreg-Hegy, B&C – traversing Enying Ridge; • Various corrections needed to produce relative Bouguer Anomaly map; • Anomaly profiles each represent complex structures on many different scales; • There is no evidence for a tectonic origin for the Enying Ridge formation. • Acknowledgements: Res1 and Res2 for their results; Greg Houseman and Piroska Lorinczi for all their help.

  18. Question Time Measuring gravity gets lonely

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