We Never Know
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They appeared in Morocco before the quake hit.
"Reports of “earthquake lights,” like the ones seen in videos captured before Friday’s 6.8-magnitude earthquake in Morocco, go back centuries to ancient Greece.
These outbursts of bright, dancing light in different colors have long puzzled scientists, and there’s still no consensus on what causes them, but they are “definitely real,” said John Derr, a retired geophysicist who used to work at the US Geological Survey. He has coauthored several scientific papers on earthquake lights, or EQL.
“Seeing EQL depends on darkness and other favorability factors,” he explained in an email"
amp-cnn-com.cdn.ampproject.org
"An earthquake light is a luminous aerial phenomenon that appears in the sky at or near areas of tectonic stress, seismic activity, or volcanic eruptions. There is no broad consensus as to the causes of the phenomenon involved"
en.m.wikipedia.org
"Reports of “earthquake lights,” like the ones seen in videos captured before Friday’s 6.8-magnitude earthquake in Morocco, go back centuries to ancient Greece.
These outbursts of bright, dancing light in different colors have long puzzled scientists, and there’s still no consensus on what causes them, but they are “definitely real,” said John Derr, a retired geophysicist who used to work at the US Geological Survey. He has coauthored several scientific papers on earthquake lights, or EQL.
“Seeing EQL depends on darkness and other favorability factors,” he explained in an email"
Morocco earthquake lights: strange light phenomenon before some quakes is a long standing mystery | CNN
"An earthquake light is a luminous aerial phenomenon that appears in the sky at or near areas of tectonic stress, seismic activity, or volcanic eruptions. There is no broad consensus as to the causes of the phenomenon involved"