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'Surprise' Palu tsunami clue found on seafloor - BBC News - 0 views

www.bbc.com/...science-environment-46515833 tsunami hazards
shared by Benjamin McKeown on 11 Dec 18 - No Cached
  • he quake occurred on what is called a strike-slip fault, where the ground on one side of a rupture moves horizontally past the ground on the other side. It is not a configuration normally associated with very large tsunamis.
  • When we overlap the bathymetric data from before and after, we can see that almost all of the area of the seafloor inside the bay subsides. And from this data, we can also observe [the movement] to the north. So, actually, we have a vertical and a horizontal displacement,
  • here is evidence of several underwater landslides in the data. These, too, could have been a factor
  • ...3 more annotations...
  • nother possibility is an upwards thrust of the seabed in a zone some distance from Palu where the strike-slip fault splits into diverging tracks
  • Palu witnessed a lot of liquefaction, where the structure of soils in the city was seen to collapse, to become fluidised and flow even on very low gradients.
  • That basically leaves no time for warnings. That's very different from Japan (in 2011) where there was an eternity of time - more than 30 minutes everywhere until the first person was killed by the tsunami. That's the challenge for these local tsunamis: people have to self-evacuate."
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