Gravity field separation

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gravity field separation lecture, undergraduate geophysics course.

gravity field separation lecture, undergraduate geophysics course.

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  • 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