BANGKOK, 25 April — Myanmar’s junta has continued a deadly military campaign, including airstrikes and artillery assaults, despite announcing a ceasefire after a major earthquake killed thousands in March, according to the United Nations and data from a crisis monitor.

The 28 March quake, the worst natural disaster to hit the impoverished nation in decades, triggered a multinational relief effort to support hundreds of thousands already devastated by conflict and prompted repeated international calls to halt the fighting.