Some interesting explanations about earthquake lights on Wikipedia. https://en.wikipedia.org/wiki/Earthquake_light: Disclaimer: Wikipedia is not a reliable source of information, but it is still worth checking, just like anything else. Some of the explanations: ionisation; a disruption of the magnetosphere; and simply a form of static electricity, from rocks rubbing together.
Some interesting explanations about earthquake lights on Wikipedia. https://en.wikipedia.org/wiki/Earthquake_light: Disclaimer: Wikipedia is not a reliable source of information, but it is still worth checking, just like anything else. Some of the explanations: ionisation; a disruption of the magnetosphere; and simply a form of static electricity, from rocks rubbing together.