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Gravity field separation
 

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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    Gravity field separation Gravity field separation Presentation Transcript

    • Gravity Field Separation Gravity Field= Regional + Residual Regional Field comes from deep seated structures like Moho Residual field comes from shallow (near surface) structures
    • Example Observed gravity (Bouguer) map
    • Using graphical separation method
    • Regional field
    • Residual field
    •  Regional fields are generally smoother than residual>  Residual anomalies are usually higher in amplitude
    • 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.
    • Another example