Kathmandu, Sept 1 An earthquake occurred at 1:11 am today with its epicenter at Tungechha in Bhojpur district. The National Earthquake Monitoring and Research Centre said that a magnitude 4 earthquake occurred in and around Tungechha, Bhojpur. Earlier, an earthquake 3.9 ML in the Richter scale had occurred on August 17 at Khiratadi area in Bajhang district. In the recent times, the eastern and western hilly and mountainous regions in Nepal have witnessed incidences of earthquake.