gravity field separation
DESCRIPTION
gravity field separation lecture, undergraduate geophysics course.TRANSCRIPT
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Gravity Field Separation
Gravity Field= Regional + Residual
Regional Field comes from deep seated structures like Moho
Residual field comes from shallow (near surface) structures
![Page 2: Gravity field separation](https://reader036.vdocument.in/reader036/viewer/2022062514/55842422d8b42a86478b4951/html5/thumbnails/2.jpg)
Example
Observed gravity (Bouguer) map
![Page 3: Gravity field separation](https://reader036.vdocument.in/reader036/viewer/2022062514/55842422d8b42a86478b4951/html5/thumbnails/3.jpg)
Using graphical separation method
![Page 4: Gravity field separation](https://reader036.vdocument.in/reader036/viewer/2022062514/55842422d8b42a86478b4951/html5/thumbnails/4.jpg)
Regional field
![Page 5: Gravity field separation](https://reader036.vdocument.in/reader036/viewer/2022062514/55842422d8b42a86478b4951/html5/thumbnails/5.jpg)
Residual field
![Page 6: Gravity field separation](https://reader036.vdocument.in/reader036/viewer/2022062514/55842422d8b42a86478b4951/html5/thumbnails/6.jpg)
Observe the differences
Regional fields are generally smoother than residual> Residual anomalies are usually higher in amplitude
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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.
![Page 8: Gravity field separation](https://reader036.vdocument.in/reader036/viewer/2022062514/55842422d8b42a86478b4951/html5/thumbnails/8.jpg)
Another example
Bouguer
![Page 9: Gravity field separation](https://reader036.vdocument.in/reader036/viewer/2022062514/55842422d8b42a86478b4951/html5/thumbnails/9.jpg)
Regional
![Page 10: Gravity field separation](https://reader036.vdocument.in/reader036/viewer/2022062514/55842422d8b42a86478b4951/html5/thumbnails/10.jpg)
Residual
![Page 11: Gravity field separation](https://reader036.vdocument.in/reader036/viewer/2022062514/55842422d8b42a86478b4951/html5/thumbnails/11.jpg)
Possible Interpretation