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Gravity

Gravity. Kyle Gray Shelby McManus Andrew Hook. Photo: http://www.csr.utexas.edu/grace/. Complete Bouguer Anomaly (CBA). Geosoft corrections: terrain, tide, drift, latitude, free air, bouguer. Regional T rend. Geosoft Trend Removal Tool. Residualizing. - Comparison of 3 techniques

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Gravity

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  1. Gravity Kyle Gray Shelby McManus Andrew Hook Photo: http://www.csr.utexas.edu/grace/

  2. Complete Bouguer Anomaly (CBA) • Geosoft corrections: terrain, tide, drift, latitude, free air, bouguer Regional Trend

  3. Geosoft Trend Removal Tool Residualizing -Comparison of 3 techniques -Shows basin anomalies -Note difference in anomaly magnitude -11 mGal mGal Control Points Basin Grid – Bedrock Grid -6 mGal -13 mGal

  4. Bouguer Slab Equation Basin Thickness Estimates (using control point residual values as input) 1180 m basin thickness 40% error when density contrast is increased to -0.5 g/cc (basin becomes more shallow)

  5. GM-SYSModel • Proposed deepest part of the basin is 580 m • Compares to 525 - 875 m Bouguer estimate CI = 1 Should be bedrock A’ A

  6. GM-SYSModel CI = 1 Glacial moraine forms thick package of basin fill? Shallow bedrock cover A’ A B B’ Twin Peaks Fallen Leaf Lake

  7. Why does this matter? • Deeper basin = greater seismic shaking at surface during earthquake

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