There was no immediate report of any loss of life or property due to it.
Tremors were felt at 1.25 AM this morning with its epicentre located in Kohima district of Nagaland, the India Meteorological Department (IMD) said, adding that the quake originated 35 km below the surface.
The tremors followed two moderate intensity quakes that shook parts of northeastern states, including Nagaland, on July 1.
While a tremor of 4.8 magnitude took place at 1.13 AM in Arunachal Pradesh, the second one measuring 5.8 on the Richter Scale occurred at 9.43 AM, with its epicentre located in the Phek region of Nagaland.