World Vision worried about staff in Nepal

World Vision chief Tim Costello is desperately worried for the fate of locals and his staff following a second earthquake in Nepal.

He is yet to make contact with his 200 aid workers on the ground or receive any damage assessments because communications are down.

Reverend Costello, who was in Nepal in April following the first quake, was not surprised there was a further quake and described the aftershocks as terrifying.

Oxfam's Nepal country director Cecilia Keizer said two of their vehicles had been offered to ferry casualties to medical centres.

"Our team in Nuwakot also saw a building collapse, and reported a landslide on slopes above them," Ms Keizer told AAP in a statement from Nepal.

"The Gorkha team reported building collapses in Gorkha, the epicentre of the previous earthquake."