Tsunamis and earthquake thrusts

[Astronuc]

I came across an interesting video on three massive earthquakes and the thrusts that caused tsunamis.


Just because an earthquake is large, i.e., mag 7 or mag 8 or greater, and in the ocean doesn't mean it will produce a tsunami. It does depend on the depth and location as well, and how much elastic energy is stored in the mass (or volume) of crust, and the displacement.

 

[davenn]

Hi Astronuc

interesting video describing why there are variations in tsunami height

from what I have so far read, this latest Chilean event produced a tsunami of only ~ 2 metres ( fortunately!)

Would have been good to have seen what reasons they had considered specifically for the Sumatran event

cheers
Dave

 

[Astronuc]

The earthquake off Banda Aceh was mag 9.1, so a very powerful earthquake with a large volume of displacement.

https://earthquake.usgs.gov/earthquakes/eventpage/us2004slav/executive

More on recent Indonesian earthquakes - https://www.eeri.org/category/learning-from-earthquakes/indonesia/