Depth Estimation from Gravity Data Using the Maximum Entropy Method (MEM) and the Multi Taper Method (MTM) |
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| Authors: | Abhey Ram Bansal Vijay P Dimri G Vidya Sagar |
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| Institution: | (1) National Geophysical Research Institute, Hyderabad, 500 007, India |
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| Abstract: | The depth determination from the gravity data in frequency domain is carried out using the classical fast Fourier transform
(FFT) method utilizing scaling properties of ensemble of anomalous source. The problem of calculating power spectrum from
the FFT is well described in the literature. Here, the application of other high-resolution methods of power spectrum calculation,
such as maximum entropy method (MEM) and multi-taper method (MTM) are explored to estimate depth to anomalous sources. At
the outset, the FFT, the MEM and the MTM are tested on synthetic gravity data, generated for different types of synthetic
models and then all these methods are applied to the field gravity data of the Bengal basin. The MTM with scaling is found
to be superior for providing the detailed subsurface information rather than the MEM and the FFT methods in the case of synthetic
as well as field examples. |
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| Keywords: | Maximum entropy method multi-taper method scaling spectral method gravity |
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