L03_GravCorrAnalysis-page6

L03_GravCorrAnalysis-page6 - formula for depth and size of...

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Applied Geophysics – Corrections and analysis Analysis and interpretation Once we have made our gravity observations, corrected for surface effects, we attempt to deduce sub-surface structure Considerations: Anomaly profile (2D structure) or map (3D structure)? If anomaly length > twice the width a 2D interpretation is OK Ambiguity There are an infinite number of structures that could generate the observations Forward calculation “Guess” at structure, calculate the anomaly and compare. Simple
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Unformatted text preview: formula for depth and size of geometric shapes. • Inverse modeling Directly invert for structure, choose constraints on the geometry …don’t forget that ambiguity. Applied Geophysics – Corrections and analysis Buried sphere ( ) [ ] 2 3 2 2 2 3 1 1 3 4 z x z GR g z + ∆ = ∆ ρ π Analytic expressions for simple geometric shapes e.g. a buried sphere 2 1 302 . 1 x z = Depth rule Note: it is only the density contrast that is important...
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This note was uploaded on 01/07/2012 for the course PHYSICS 384 taught by Professor Wei during the Spring '09 term at SUNY Stony Brook.

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