Physics
Scientific paper
Jun 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985pepi...39...52r&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 39, Issue 1, p. 52-61.
Physics
13
Scientific paper
Magnetic field variations recorded using an array of magnetometers have shown earlier significant anomalies at some southern stations of India, e.g., Annamalainagar, Adiramapatnam and Trivandrum. The nature of anomalous horizontal and vertical fields and their persistence to periods of the order of hours, cannot be explained in terms of the usual coast effect alone. Some authors have suggested that these anomalies could be caused by the electric currents induced in the deep ocean but channelled through a good conductor situated below the Palk-strait and Gulf of Manowar between India and Sri Lanka.
To investigate the effect of such a deep conductor, possibly in the lower crust or upper mantle, a three-dimensional model of India, Sri Lanka and the surrounding coast lines has been studied using a numerical technique. With the aid of the well-known finite difference numerical method for partial differential equations, solutions of the magnetic fields have been computed for two different models: (1) without conductor and (2) with a conductor in the Palk-strait/Gulf of Manowar region below the ocean floor. The results are presented in the form of contour plots and spatial behaviour of the amplitudes of three magnetic field components (H, D, Z) at the surface of the Earth. Contour plots clearly reveal that, when a highly conducting sub-surface structure is introduced in the Palk-strait region, the currents tend to flow along the direction of the conductor and contribute to enhancement of the magnetic field amplitudes along the east coast of the Indian peninsula and west coast of Sri Lanka Island. The amplitude plots show that, in general, the numerical results for the model with the sub-surface conductor tend to agree with the results of the magnetometer observations, thereby supporting the hypothesis of a sub-surface conducting structure between India and Sri Lanka.
Agarwal A. K.
Ramaswamy Venkatachalam
Singh B. P.
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