Women mourn the death of their relative who died after a wall collapsed in an earthquake, in Bihar, India, May 12, 2015. [Photo/Agencies]

Tuesday's quake also left nearly 2,000 injured, according to the Home Ministry's latest count. But that toll was expected to rise as reports trickled in of people in isolated Himalayan towns and villages being buried under rubble, according to the UN's Office for the Coordination of Humanitarian Affairs.

Tremors radiated across parts of Asia. In neighboring India, at least 16 people were confirmed dead after rooftops or walls collapsed onto them, according to India's Home Ministry. Chinese media reported one death in Tibet.

The magnitude-7.8 earthquake that hit April 25 killed more than 8,150 and flattened entire villages, leaving hundreds of thousands homeless in the country's worst-recorded quake since 1934. The US Geological Survey said Tuesday's earthquake was the largest aftershock to date of that destructive quake.

Impoverished Nepal appealed for billions of dollars in aid from foreign nations, as well as medical experts to treat the wounded and helicopters to ferry food and temporary shelters to hundreds of thousands left homeless amid unseasonal rains.

Search parties fanned out to look for survivors in the wreckage of collapsed buildings in Sindhupalchowk's town of Chautara, which had become a hub for humanitarian aid after last month's quake.