A very fast simulated annealing (VFSA) global optimization method is used to interpret and modeling of magnetic anomaly over a vertically magnetized semi-infinite vertical rod-type structure. The results of VFSA optimization reveal that various parameters show a number of equivalent solutions when shape of the target body is unidentified and shape factor is also optimized together with other model parameters. The study reveals that restricting the shape factor to its actual value gives the utmost reliable results. Inversion of noise-free, noisy synthetic data and field data demonstrates the efficacy of the approach.

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Filter analysis of lineaments in Precambrian metamorphic rocks was used to delineate fracture-correlated lineaments and hydraulically significant fractures. The unfiltered analysis technique fails to show correlation between major lineaments and fractures. Domain-based and discrete filtering techniques successfully identify fracture-correlated lineaments within the brittle-ductile shear zone in conjunction with fractures characterized by high fracture frequencies (>10/m). The locales of hydraulically significant fractures can thus be assessed if the geological controls governing the spatial distribution of fracture frequencies are computed using structural domain approach. The concurrence of fracture-correlated lineaments and hydraulically significant fractures within the brittle-ductile shear zone is evident.

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