Tsunami Sensors Missed Huge Waves After Palu Quake: Official

Kanupriya Kapoor, Agustinus Beo Da Costa & Gayatri Suroyo | on 8:13 PM September 30, 2018

Jakarta. Indonesia's geophysics agency lifted a tsunami warning 34 minutes after it was first issued following a major earthquake that sent huge waves crashing into the northeastern coast of Sulawesi Island, killing hundreds and leaving thousands more homeless.

The magnitude-7.5 quake and tsunami, which hit Palu, Central Sulawesi, and further along the coastline, killed at least 384 people. Officials said on Saturday (29/09) that the death toll was likely to rise.

Hundreds of people had gathered for a festival on the beach in Palu on Friday when waves as high as 6 meters smashed onshore at dusk, sweeping many to their death.

The Meteorology, Climatology and Geophysics Agency (BMKG) faced criticism on Saturday on social media, with many questioning if the tsunami warning was lifted too soon.

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 200 kilometers 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 earthquake and tsunami center at the BMKG.

He said the closest tide gauge, which measures changes in sea level, only recorded an "insignificant," 6-centimeter 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," Triyono said.

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 kilometers per hour, occurred before or after the warning had been lifted.

"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 Dec. 26, 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.

Palu sits at the mouth of a narrow bay in northeastern Sulawesi and is home to around 380,000 people. It was hit by a tsunami in 1927 and 1968, according to the National Disaster Mitigation Agency (BNPB).

Baptiste Gombert, a geophysics researcher at the University of Oxford, said it was "surprising" the quake had generated a tsunami.

Friday's quake was recorded as a "strike-slip" event where neighboring 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 that the narrow bay may have concentrated the force of the waves as they moved toward the shore.

BNPB spokesman Sutopo Purwo Nugroho told reporters that his team had been "preparing to send public warnings that were easy to understand" when the tsunami warning was "suddenly ended."

The Ministry of Communication and Information Technology said repeated warnings were sent out to residents via text message, but Sutopo 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..." Twitter user @zanoguccy said in a direct message to the BMKG.

Jakarta Globe | Reuters

Photo: The remains of the iconic Palu IV, or Panolele Bridge, in Palu, Central Sulawesi, pictured on Sunday (30/09), two days after a magnitude-7.4 earthquake and tsunami hit the area. (Antara Photo/Akbar Todo)