Earthquakes generate a lot of data fairly quickly, and I suspect eventually we'll be able to spot seismic fingerprints of the types that do generate tsunamis to be able to have more accurate warnings. For now we have to deal with this cautious warning approach, but in the future I suspect they'll be able to fairly confidently say "low risk of tsunami" in a short period after the quake.
It'll be interesting to see where the follow up quakes happen, there are usually some related ones that show up far from the source in the following days.
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