Authorities are reportedly focusing rescue efforts on Palu, though other communities along the tsunami’s pathway have been devastated, as have those further up the mountainous terrain, which were hit hardest by the earthquakes and ensuing mudslides.
With authorities setting a tentative deadline of Friday for rescue efforts, hopes for finding more people alive are dwindling.
Also, wind-generated waves break as they shoal and lose energy offshore. A twenty foot tsunami is a twenty foot rise in sea level.
In deep water (greater than 600 feet), tsunamis are rarely over 3 feet and are not normally noticed by ships due to their long period or time between crests.
There are a few signs like hard ground shaking for 20 seconds near the coast or a sudden sea level withdrawal. Once an earthquake has occurred, the arrival time of a tsunami, if generated, can be determined accurately.
Tsunamis may be accompanied by loud, booming noises. There is not normally enough time to accurately predict tsunami heights near the source.
Men scavenge for food inside an abandoned warehouse in an earthquake and tsunami-affected area in Palu, Central Sulawesi, Indonesia Indonesia, Wednesday, Oct. Clambering over the reeking pile of sodden food or staking out a patch of territory, people who had come from devastated neighborhoods and elsewhere in the remote Indonesian city pulled out small cartons of milk, soft drinks, rice, candy, and painkillers from the pile as they scavenge for anything edible in the warehouse that tsunami waves had pounded.
Plumes of volcanic ash rise out of Mount Soputan, Wednesday, Oct.