Indonesian authorities have come under fire after it emerged a tsunami warning was LIFTED 34 minutes before huge waves smashed into Sulawesi island, killing hundreds.
Homes were destroyed and thousands have been forced to evacuate following the tsunami, which followed a 7.5 magnitude earthquake yesterday.
It hit the city of Palu and the surrounding coastline, killing at least 384 people – and officials say they expect the death toll to rise.
The country’s disaster agency had tried to share warnings, but said a communication outage meant many did not receive them.
Hundreds of people had gathered for a festival on the beach in Palu yesterday when waves as high as six metres (18 feet) smashed onshore at dusk, sweeping many to their death.
A tsunami wave hits shore in Palu, Indonesia Sulawesi Island,
Medical team members help patients outside a hospital after the quake
- Indonesia earthquake control tower hero sacrifices himself so plane can safely take-off saving ‘hundreds of lives’
Indonesia’s geophysics agency (BMKG) faced criticism, with many questioning the decision to lift the tsunami warning so soon after the initial earthquake.
The agency said it followed standard operating procedure and made the call to "end" the warning based on data available from the closest tidal sensor, around 125 miles from Palu.
"We have no observation data at Palu. So we had to use the data we had and make a call based on that," said Rahmat Triyono, head of the earthquakes and tsunami centre at BMKG.
People walk near the ruins of a shop at the beach after a tsunami hit in Palu
- Massive earthquake and tsunami hit Indonesia killing at least 384
He said the closest tide gauge, which measures changes in sea level, only recorded an "insignificant", six-centimetre wave and did not account for the giant waves near Palu.
"If we had a tide gauge or proper data in Palu, of course it would have been better. This is something we must evaluate for the future," said Triyono.
It was not clear whether the tsunami, which officials say hammered Palu and the surrounding area at extremely high speeds measuring in the hundreds of kilometres per hour, occurred before or after the warning had been lifted.
Authorities are unable to confirm how many people died in the earthquake and tsunami
"Based on the videos circulating on social media, we estimate the tsunami happened before the warning officially ended," Triyono said.
Indonesia sits on the Pacific Ring of Fire and is regularly hit by earthquakes. The most devastating came on Boxing Day in 2004, when a magnitude 9.5 quake triggered a massive tsunami that killed around 226,000 people along the shorelines of the Indian Ocean, including over 126,000 in Indonesia.
The scenic town of Palu sits at the mouth of a narrow bay in northeastern Sulawesi and is home to around 380,000 people.
More than 380 people have been confirmed dead, but authorities say the death toll will be far higher
It was hit by a tsunami in 1927 and 1968, according to Indonesia’s national disaster mitigation agency (BNPB).
Baptiste Gombert, a geophysics researcher at University of Oxford, said it was "surprising" the quake had generated a tsunami.
Friday’s quake was recorded as a "strike-slip" event where neighbouring tectonic plates move horizontally against each other, rather than vertically, which is what usually generates a tsunami.
"There is some speculation that there was a landslide under the sea which displaced a lot of water and caused the tsunami," he said, adding the narrow bay may have concentrated the force of the waves as they moved toward the shore.
A patient is given medical care following the earthquake
Officials say buildings collapsed as a result of the tremor
Sutopo Purwo Nugroho, spokesman for the disaster agency, told reporters his team had been "preparing to send public warnings that were easy to understand" when the tsunami warning was "suddenly ended".
The communications ministry said repeated warnings were sent out to residents via text message, but Nugroho said the quake had brought down the area’s power and communications lines and there were no sirens along the coast.
Indonesians took to social media to question the BMKG’s move to lift the tsunami warning and a failure to release information in a timely manner.
"So upset.. the warning was lifted.. although a tsunami happened…" said one Twitter user @zanoguccy in a direct message to BMKG.
In Palu, more than 16,000 people were evacuated after the disaster struck.