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Image source, AFP. There were no sirens along the coast to alert residents to evacuate. What actually happened? But it lifted the warning just over 30 minutes later. Were people aware there was a tsunami? On the ground report: Survivors guard rubble of Indonesian tsunami town In pictures: Search for Indonesia tsunami survivors Air traffic controller hailed as quake hero. Does Indonesia have a tsunami early warning system?
Tsunami buoys were given to Indonesia a decade ago to improve its early-warning system - but none remain functioning. Could more lives have been saved? Indonesia's geophysics agency BMKG admits its systems are lacking. But was the tsunami expected? Earthquakes on subduction zones can generate vertical motion that propel tsunamis to land. But this tsunami was generated after a quake began on land on a strike-slip fault — the same kind of fault like the San Andreas, where one block of land slides past the other horizontally.
There are other possible explanations for why a tsunami hit Palu so hard. One is that the bay starting moving back and forth, like someone shaking a mug filled with coffee, leaving the liquid to slosh onto land, Synolakis said.
Another possibility is that the fault movement caused just one side of the bay to move, pushing water toward the other side, Synolakis said. One thing is clear: Technology cannot be the only answer to tsunami warnings, especially in Indonesia, with its 17, islands. Eddie Bernard, a former director of the Pacific Tsunami Warning Center, expressed sympathy for his tsunami scientist colleagues in Indonesia.
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Times Events. Times Store. Facebook Twitter Show more sharing options Share Close extra sharing options. People observe wreckage Monday after the tsunami that killed at least 1, people in Palu, Indonesia.
Survivors offer Friday prayers at a makeshift camp outside a damaged mosque in Palu. Residents look for their belongings amid the debris of destroyed houses in Palu, Indonesia. It is too late for central Sulawesi, where walls of water up to 6 meters 20 feet high and a magnitude 7.
Part of that drive, using funding from Germany and elsewhere, included deploying a network of 22 buoys connected to seafloor sensors to transmit advance warnings. A sizeable earthquake off Sumatra island in that caused panic in the coastal city of Padang revealed that none of the buoys costing hundreds of thousands of dollars each were working.
When the 7. Friday, the meteorology and geophysics agency issued a tsunami alert, warning of potential for waves of 0. It ended the warning at p. This is the data the tsunami detection system could provide. Based on tidal gauge data and a field observation report from a staff member in Palu, the Indonesian meteorological agency lifted its tsunami warning at p. Tsunamis in Sulawesi tend to happen soon after earthquakes, leaving little time for tidal gauges set at minute intervals to register them before they come ashore.
Some criticism centers on the lack of sirens to warn residents of oncoming waves and shelters on higher ground to accommodate evacuees. Despite the risk of frequent tsunamis up and down the Sulawesi coast, little of this infrastructure exists in Palu. Jason Patton, a geophysicist who works for Temblor, a consulting firm, and teaches at Humboldt State University in California.
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