Indonesia is struggling to find bodies and survivors after a tsunami smashed into a remote island chain and a volcano erupted.
Over 300 people have been killed and more than 400 are still missing after natural disasters that struck less than 24 hours apart.
Thousands more have been displaced after entire villages were washed away and houses flattened when waves triggered by a powerful earthquake on Monday hit an area off the west coast of Sumatra.
The area is on a major fault line in a region known as the Pacific Ring of Fire.
West Sumatra disaster management head Harmensyah said: 'When the tsunami struck there were dozens of fishermen out at sea.
'Their bodies were found the next morning floating on the water or cast ashore on the beach.
'We need to find the missing people as soon as possible. Some of them might have run away to the mountains, but many would have been swept away.'
Several hundred kilometres away on the central island of Java, another 29 people have died after the country's most active volcano erupted.
Mount Merapi spewed searing clouds of gas and molten lava into the sky.
Thousands of villagers have been ordered to leave the area and move to temporary shelters.
A spokesman for Sardjito hospital in nearby Yogyakarta said: 'So far, 29 people were killed. Most of them had 45% to 90% burns on their bodies and covered in volcanic ash.'
An elder known as the volcano's spiritual gatekeeper is believed to be among the dead.
Monday's 7.7-magnitude quake struck in the remote Mentawai Islands, an area popular with surfers, generating waves as high as three metres and sweeping away ten villages.
The tsunami surged as far as 600 metres inland on South Pagai island. On North Pagai island almost 200 houses were flattened.
Medical personnel are on their way to the worst-hit areas but rescue efforts have been hampered by disruption to communications in the islands.
Indonesian President Susilo Bambang Yudhoyono has cut short a visit to Vietnam for a summit of Southeast Asian leaders because of the disasters.
US President Barack Obama, who lived in Indonesia as a boy, has voiced his sadness over the deaths and pledged US help.
'As a friend of Indonesia, the United States stands ready to help in any way,' he said.
