Cachar Earthquake of December 31, 1984 is it a Signal for the Beginning of Seismic Activity?

The Cachar earthquake of December 31, 1984 is significant on two counts: i) It occurred in a region identified to be experiencing dilatancy stage precursory to a large earthquake by Gupta and Singh (1980), ii) An earthquake of magnitude exceeding 6 has occurred in the vicinity of the Shillong Plateau after a lapse of four decades. This may be signal of beginning of a seismically active period in the vicinity of Shillong Plateau similar to the one between 1869 and 1943 when six large earthquakes occurred in this region.