As the death toll rises from the tsunami disaster in Indonesia, experts say there are seven volcanoes across the archipelago in an "eruption phase".

Anak Krakatau erupted on Saturday, spewing ash and smoke and is believed to have triggered a landslide which caused the tsunami.

By Tuesday the death toll from the disaster had risen to 373 people.

Anak Krakatau is one of 127 active volcanoes across Indonesia and seven, including Krakatau, are currently in an "eruption phase", volcanologist Dr Janine Krippner at Concord University said.