Gravity field separation

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gravity field separation lecture, undergraduate geophysics course.

Text of Gravity field separation

  • 1. Gravity Field Separation Gravity Field= Regional + Residual Regional Field comes from deep seated structures like Moho Residual field comes from shallow (near surface) structures

2. Example Observed gravity (Bouguer) map 3. Using graphical separation method 4. Regional field 5. Residual field 6. Regional fields are generally smoother than residual> Residual anomalies are usually higher in amplitude 7. Separation Methods Graphical method: Depends on removing the trend ( regional) from Bouguer anomalies. Griffin Method Applying averaging scheme to gravity maps through averaging the gravity values around a point then subtracting from the gravity value at the point to get the residuals. 8. Another example