In this study, we aim to improve the scaling between the moment magnitude(MW), local magnitude(ML), and the duration magnitude(MD) for 162 earthquakes in Shillong-Mikir plateau and its adjoining region of northeast India by extending the MWestimates to lower magnitude earthquakes using spectral analysis of P-waves from vertical component seismograms. The MW-MLand MW-MDrelationships are determined by linear regression analysis. It is found that, MWvalues can be considered consistent with MLand MD, within 0.1 and 0.2 magnitude units respectively, in 90 % of the cases. The scaling relationships investigated comply well with similar relationships in other regions in the world and in other seismogenic areas in the northeast India region.
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