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Showing posts from January, 2018

Principles and limitations geophysical method of exploration

Geophysics simply means the application of principles of physics in the study of the earth. The application of geophysics is vast. It can be used to study the entire Earth (Global geophysics), or for localized survey of the crust e.g for Engineering purposes. Geophysical survey is broadly classified into two based on the source of energy.          Natural field: This uses the electric, magnetic,  electromagnetic and gravitational fields of the           Earth.          Artificial source: Involves the generation of artificial electrical or electromagnetic fields into the       earth by a means of a D.C. Magnetic method is applied when searching for buried magnetite ores because of their high magnetic susceptibility. Electrical method is used when exploring for ground water because rocks resistances differ according to their water saturation levels. Seis...