Keep trying relatives in Nepal: PM

With several hundred Australians still unaccounted for in Nepal, Prime Minister Tony Abbott has urged people to keep trying to contact relatives who have travelled there.

Saturday's 7.8-magnitude quake in Nepal killed more than 2500 people, the worst disaster to hit the impoverished Himalayan nation in more than 80 years.

Mr Abbott said a lot of people out trekking will be difficult to contact and people should phone the Department of Foreign Affairs and Trade if they can't get in touch with their loved ones.