A geohazards specialist says the mass landslides caused by Monday's 7.5 earthquake in Papua New Guinea pose a risk of destructive floods.
Reports of casualties and damage filtering through from the remote affected Highlands region say many of the deaths were caused by landslides.
Due to disrupted telecommunication and transport links, information about the number of deaths remains patchy.
But as many as fifty deaths have been reported across parts of Hela, Southern Highlands and Western provinces.
Aerial footage shows the quake triggered many big landslides which have blocked whole valleys and deformed substantial tracts of hillsides.
Dave Petley, the Pro-Vice-Chancellor (Research and Innovation) at from the UK's University of Sheffield, told Johnny Blades the risk is that significant volumes of water build up behind dams created by landslides and then spill over.