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Reading: Interpretation of gravity anomalies over the eighty-five East Ridge in the Bay of Bengal

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Interpretation of gravity anomalies over the eighty-five East Ridge in the Bay of Bengal

Authors:

DA Tantrigoda,

University of Sri Jayewardenepura, LK
About DA

Department of Physics

 

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MMPM Fernando

University of Sri Jayewardenepura, LK
About MMPM
Department of Physics
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Abstract

Several profiles of the negative gravity anomaly over the submerged 85º E ridge in the Bay of Bengal of the Indian Ocean have been interpreted in two dimension and results are combined together to give a detailed picture of its morphology and thickness of surrounding sediments. The observed negative gravity anomaly has been explained as the combined effect due to the positive mass anomaly caused by the replacement of sediments by high dense igneous rocks of the ridge, and the negative mass anomaly caused by replacing the high dense upper mantle material by the oceanic crust, which has been bended and sunk into the upper mantle due to the pressure exerted by the ridge. Downward migration of the oceanic crust has been also calculated assuming that the oceanic crust is behaving as a thin infinite elastic plate resting on inviscid fluid half space and is found to closely agree with the results of the gravity study. Both studies indicate that the thickness of the ridge vary from 11 km to 16 km while the oceanic crust has undergone a depression of 9 km to 14 km.
How to Cite: Tantrigoda, D. and Fernando, M., 2018. Interpretation of gravity anomalies over the eighty-five East Ridge in the Bay of Bengal. Journal of the National Science Foundation of Sri Lanka, 46(4), pp.487–494. DOI: http://doi.org/10.4038/jnsfsr.v46i4.8624
Published on 31 Dec 2018.
Peer Reviewed

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