Abstract
Conventionally, the continuation of potential fields is performed either in space domain or in the Fourier wavenumber domain. In this paper we forward the formulation of continuation via the Radon transform domain. Radon transform (Deans, 19831, known as T-P transform or plane-wave decomposition (PWD) (Treitel et al, 19821, was introduced to potential fields in an attempt to improve the gridding quality of parallel line based airborne geophysical data (Zhou and Fokkema, 19921. One great interest of applying the Radon transform to potential field data is that it decomposes the anomaly from its 2D spatial distribution into a domain where it appears as energy distribution against its strike direction, namely the Strike-Direction Decomposition (SDD). The advantage of the SDD enables us to select and work on anomalies according to their strike directions. The potential field continuation in the space or wavenumber domain takes all information measured into account to derive the field value at other altitudes. However, continuation in the Radon transform domain leads to a new concept of direction-band continuation. For example, we are allowed to continue fields downwards within particular strike-bands of interest in the Radon transform domain, while anomalies in all other strike directions are untouched. This operation yields a map with sharp contrast in which linear anomalies in a particular strike-band are enhanced. Thus we may produce a residual anomaly map for this particular strike-band by subtracting the original input from the processed map. convolution.
Published Version
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