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Gravity • Theory • Measurement practices – Relative – Closed loops • Corrections – Drift – Free Air – Bouguer – Terrain • Interpretation – Modeling

Gravity Theory Measurement practices –Relative –Closed loops Corrections –Drift –Free Air –Bouguer –Terrain Interpretation –Modeling

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Page 1: Gravity Theory Measurement practices –Relative –Closed loops Corrections –Drift –Free Air –Bouguer –Terrain Interpretation –Modeling

Gravity

• Theory• Measurement practices

– Relative– Closed loops

• Corrections– Drift– Free Air– Bouguer– Terrain

• Interpretation– Modeling

Page 2: Gravity Theory Measurement practices –Relative –Closed loops Corrections –Drift –Free Air –Bouguer –Terrain Interpretation –Modeling

Page 3: Gravity Theory Measurement practices –Relative –Closed loops Corrections –Drift –Free Air –Bouguer –Terrain Interpretation –Modeling

Page 4: Gravity Theory Measurement practices –Relative –Closed loops Corrections –Drift –Free Air –Bouguer –Terrain Interpretation –Modeling

Page 5: Gravity Theory Measurement practices –Relative –Closed loops Corrections –Drift –Free Air –Bouguer –Terrain Interpretation –Modeling

Page 6: Gravity Theory Measurement practices –Relative –Closed loops Corrections –Drift –Free Air –Bouguer –Terrain Interpretation –Modeling

Page 7: Gravity Theory Measurement practices –Relative –Closed loops Corrections –Drift –Free Air –Bouguer –Terrain Interpretation –Modeling

Page 8: Gravity Theory Measurement practices –Relative –Closed loops Corrections –Drift –Free Air –Bouguer –Terrain Interpretation –Modeling

Page 9: Gravity Theory Measurement practices –Relative –Closed loops Corrections –Drift –Free Air –Bouguer –Terrain Interpretation –Modeling

Page 10: Gravity Theory Measurement practices –Relative –Closed loops Corrections –Drift –Free Air –Bouguer –Terrain Interpretation –Modeling

Page 11: Gravity Theory Measurement practices –Relative –Closed loops Corrections –Drift –Free Air –Bouguer –Terrain Interpretation –Modeling

Page 12: Gravity Theory Measurement practices –Relative –Closed loops Corrections –Drift –Free Air –Bouguer –Terrain Interpretation –Modeling

Page 13: Gravity Theory Measurement practices –Relative –Closed loops Corrections –Drift –Free Air –Bouguer –Terrain Interpretation –Modeling

Worden Gravimeter

Page 14: Gravity Theory Measurement practices –Relative –Closed loops Corrections –Drift –Free Air –Bouguer –Terrain Interpretation –Modeling

Inside the Worden

Page 15: Gravity Theory Measurement practices –Relative –Closed loops Corrections –Drift –Free Air –Bouguer –Terrain Interpretation –Modeling

Page 16: Gravity Theory Measurement practices –Relative –Closed loops Corrections –Drift –Free Air –Bouguer –Terrain Interpretation –Modeling

Page 17: Gravity Theory Measurement practices –Relative –Closed loops Corrections –Drift –Free Air –Bouguer –Terrain Interpretation –Modeling

Page 18: Gravity Theory Measurement practices –Relative –Closed loops Corrections –Drift –Free Air –Bouguer –Terrain Interpretation –Modeling

Closing the Loop

Page 19: Gravity Theory Measurement practices –Relative –Closed loops Corrections –Drift –Free Air –Bouguer –Terrain Interpretation –Modeling

Elevation Corrections

Free Air Correction

Bouguer Correction

Page 20: Gravity Theory Measurement practices –Relative –Closed loops Corrections –Drift –Free Air –Bouguer –Terrain Interpretation –Modeling

Gravity Corrections

• Drift Correction(tobs-tbase) x drift rate

• Free Air Correction(hobs-hbase) * 0.3086 mgal/m

• Bouguer Correction(hobs-hbase) * 0.04193 mgal/m

where = density in gr/cc

Page 21: Gravity Theory Measurement practices –Relative –Closed loops Corrections –Drift –Free Air –Bouguer –Terrain Interpretation –Modeling

Gravity Anomalies

• Free Air Anomaly gfa = (gobs-gbase) – (drift corr) + (fa corr)

• Bouguer Anomaly

gb = gfa –(bouguer correction)

Page 22: Gravity Theory Measurement practices –Relative –Closed loops Corrections –Drift –Free Air –Bouguer –Terrain Interpretation –Modeling

Gravity Corrections(sample)

Page 23: Gravity Theory Measurement practices –Relative –Closed loops Corrections –Drift –Free Air –Bouguer –Terrain Interpretation –Modeling

Page 24: Gravity Theory Measurement practices –Relative –Closed loops Corrections –Drift –Free Air –Bouguer –Terrain Interpretation –Modeling

Page 25: Gravity Theory Measurement practices –Relative –Closed loops Corrections –Drift –Free Air –Bouguer –Terrain Interpretation –Modeling

Page 26: Gravity Theory Measurement practices –Relative –Closed loops Corrections –Drift –Free Air –Bouguer –Terrain Interpretation –Modeling

Page 27: Gravity Theory Measurement practices –Relative –Closed loops Corrections –Drift –Free Air –Bouguer –Terrain Interpretation –Modeling

Page 28: Gravity Theory Measurement practices –Relative –Closed loops Corrections –Drift –Free Air –Bouguer –Terrain Interpretation –Modeling

Page 29: Gravity Theory Measurement practices –Relative –Closed loops Corrections –Drift –Free Air –Bouguer –Terrain Interpretation –Modeling

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