JAKARTA - A TSUNAMI and a volcanic eruption in Indonesia have killed more than 300 people with over 400 missing and tens of thousands displaced, authorities said on Wednesday.

One of Indonesia's most active volcanoes spewed out clouds of ash and jets of searing gas in an eruption that has killed at least 28 people and injured 14.

Mount Merapi, on the outskirts of the city of Yogyakarta on Java island, first erupted on Tuesday, a day after a tsunami pounded remote islands in western Indonesia. The death toll in the tsunami was at least 282, said West Sumatra provincial disaster official Ade Edward.

The tsunami, triggered by a 7.5 magnitude quake that struck 78 km west of South Pagai, one of the Mentawai islands, flattened several villages and a surf resort. At least 411 people are still missing, Edward said.

The National Disaster Mitigation Agency said on its website that 4,000 people had been displaced by the tsunami.

Metro TV showed footage of villages flattened by the wave, with dejected survivors combing through rubble for belongings. Authorities have been battling to handle both disasters, with more than 40,000 villagers evacuated from the slopes of Mount Merapi, where many houses have been destroyed, their ruins lying covered in white ash.

Twin disasters kill 300