A possible crust-mantle configuration near Trivandrum deduced from Indian geomagnetic data

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Scientific paper

Anomalies in H and Z, primarily attributable to subsurface features, were obtained from the annual mean values at five Indian magnetic stations for the period 1965-1973, after correcting for the secular and normal variations. When the average anomaly at each station over the nine years chosen, after projecting on to a reference longitude (78°E), was plotted against its geographic latitude, the resulting ΔZ and ΔH latitudinal profiles were found to reach their maximum values near Trivandrum (TRV). This rise in anomaly near TRV has been interpreted in terms of a probable plutonic dyke-like structure, superposed on the general upwarp of the mantle known to be associated with a land-to-ocean transition. A Bouguer gravity profile along the same reference longitude, supporting this inference, is also presented. A sample calculation has been done with assumed parameters for the model and the theoretical and observed anomalies are compared.

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