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Gravity - PowerPoint PPT Presentation


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Gravity. Theory Measurement practices Relative Closed loops Corrections Drift Free Air Bouguer Terrain Interpretation Modeling. Worden Gravimeter. Inside the Worden. Closing the Loop. Elevation Corrections. Free Air Correction. Bouguer Correction. Gravity Corrections.

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Gravity


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    Presentation Transcript
    1. Gravity • Theory • Measurement practices • Relative • Closed loops • Corrections • Drift • Free Air • Bouguer • Terrain • Interpretation • Modeling

    2. Worden Gravimeter

    3. Inside the Worden

    4. Closing the Loop

    5. Elevation Corrections Free Air Correction Bouguer Correction

    6. Gravity Corrections • Drift Correction (tobs-tbase) x drift rate • Free Air Correction (hobs-hbase) * 0.3086 mgal/m • Bouguer Correction (hobs-hbase) * 0.04193r mgal/m where r = density in gr/cc

    7. Gravity Anomalies • Free Air Anomaly • Dgfa = (gobs-gbase) – (drift corr) + (fa corr) • Bouguer Anomaly Dgb = Dgfa –(bouguer correction)

    8. Gravity Corrections(sample)