Tremors of magnitude 4.0 hit Northern India early Monday, with Delhi experiencing the quake at 5.36 am and Bihar at 8.02 am. The epicentre was at Jheel Park in Dhaula Kuan, Delhi. Residents reported a loud noise due to the shallow depth of the quake. Delhi, under Seismic Zone IV, faces frequent tremors, and authorities urged caution and reassured citizens.