The epicenter of the quake was Dolkha in Nepal, around 88 km east of Kathmandu, according to the European-Mediterranean Seismological Centre (EMSC) report.
There were no reports of any damage or casualty from anywhere in the region.
The Indian Meteorological Department in-charge in Sikkim Gopinath Raha said the tremor lasted for 10.5 seconds. The quake originated at a depth of 10 km, he added.
In Patna, people, women and children came out on roads and rushed towards open spaces as soon as they felt their buildings were trembling.
Hundreds of people were seen rushing out of multi-storeyed buildings in busy main business areas such as Fraser Road, Dak Bungalow Road, SP Verma Road and Exhibition Road.
Similarly, people in residential areas such as Boring Road, Patliputra Colony, Buddha Colony, Anisabad and Gardanibag area rushed towards open spaces to save their lives.