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The "strongest" recorded was probably that from the final blast in the Krakatau eruption in 1883. This appears to been caused by the volcano's cone, already weakened by the eruptions collapsing abruptly, allowing the sea to quench the magma chamber below and create a gigantic steam explosion.

The wave may have been detected by tide-meters as far away as SW England, on the other side of the world, as a small, out-of-place swell. If so the particular part of the wave-front must have travelled up the Pacific and through the Arctic Ocean. The volcano is still active, last erupting in 2014.

The deadliest known tsunami occurred in 2004, with about 230 000 killed or missing along coasts around the Indian ocean. I think I'm right in quoting its cause, determined by sonar surveying afterwards, was an unusually large and violent massive subduction slip that moved a huge area of sea-bed something like 10 metres, very rapidly.

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9y ago

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