INTERPRETATION OF MULTIPLE RESIDUAL GRAVITY ANOMALIES BY SPHERICAL BODIES | ||||
| Journal of Egyptian Geophysical Society | ||||
| Volume 14, Issue 1, 2016, Page 1-7 PDF (606.85 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jegs.2016.385646 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
| S.A. Mehanee; K.S. Essa; M. Elhussein | ||||
| Department of Geophysics, Faculty of Science, Cairo University, | ||||
| Abstract | ||||
| The present study developed an inversion scheme for the interpretation of multiple residual gravity anomalies measured along a profile by spherical bodies. It is based on the regularized conjugate gradient method. The scheme simultaneously inverts for the characteristic parameters (depths z’s and the amplitude coefficients A’s) of all approximative bodies in the logarithmic space of model parameters (log(z) and log(|A|)) rather than in the space of model parameters themselves (z and A). Carrying out the inversion in the logarithmic space of model parameters has a number of important benefits. First, it makes the logarithmic parameters and their corresponding sensitivities (terms of the Jacobian matrix) comparable and balanced. Second, it makes the sensitivity terms dimensionally the same. Third, it imposes the positive property of the model parameters, which essentially maintains the convergence and stability of the scheme. The developed scheme has been successfully verified on synthetic examples without noise; it recovered the true values of all inverse parameters of the underlying bodies. Furthermore, the scheme is stable and can estimate the inverse parameters of the buried target with acceptable accuracy when applied to data contaminated with noise. The validity of the scheme for practical applications has been illustrated on a field example from Cuba for chromite prospecting. The scheme can be applicable for mineral exploration and shallow and deep earth imaging. It can produce non-unique solution and is sensitive to the initial guess choice. | ||||
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