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Tangentially related ... I've heard that earthquakes can be detected, perhaps even prior to the event, by changes in the ionosphere.

But last I checked, the serious geologists I worked with had an almost religious aversion to "precursor signals". Has the state of the art changed there?

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There are probably some interesting things going on with earthquakes that we don’t understand yet.

On the other hand, earthquakes are very notable events and probably cause all kinds of observational biases that make people interpret other phenomena as related. “Earthquake lights” might just be transformers shorting out, for example.

I think it’s widely accepted that many animals, including dogs, go nuts leading up to an earthquake. They can detect it, so something must be measurable.

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