Grav3d manual

GRAV3D Documentation, Release Background theory Introduction The GRAV3D suite of algorithms, developed at the UBC Geophysical Inversion Facility, is used to invert gravimetric responses over a three dimensional distribution of density contrast, or anomalous density. This manual is designed so. GRAV3D assumes a set of scattered points for generality and uses triangulation-based interpolation to determine the surface elevation above each column of cells. To ensure the accurate discretization of the topography, it is important that the topographic data be supplied over the entire area above the model and that the supplied elevation data points are not too .  · Grav3D, a GUI-based Matlab code developed to determine the three-dimensional depth structure of a density interface. The algorithm used performs iteratively in the frequency-domain based on a relationship between the Fourier transforms of the gravity data and the sum of the Fourier transforms of the powers of the depth to the interface.

This manual presents theoretical background, numerical examples, and explanation for implementing the program library GRAV3D. This suite of algorithms, developed at the UBCGeophysical Inversion Facility, is needed to invert gravimetric responses over a 3 dimensional distribution of density contrast, or anomalous density (henceforth referred to as 'density' for simplicity). The program library GRAV3D is a suit of algorithms for inverting gravity data gathered over a three dimensional earth. Version of this facility is described in detail in Li and Oldenburg (), and subsequent versions added greater flexibility and efficiency to the basic forward modelling and inversion algorithms. This manual presents theoretical background, numerical examples, and explanation for implement-ing the program library GRAV3D v This suite of algorithms, developed at the UBC Geophysical Inversion Facility, is needed to invert gravimetric responses over a 3 dimensional distribution of den-sity contrast, or anomalous density.

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