Strange lights spotted in Morocco earthquake videos may be a phenomenon reported for centuries, scientists say

 https://www.9news.com.au/world/morocco-earthquake-videos-strange-lights-may-be-phenomenon-reported-for-centuries-scientists-say/97d4bc28-2e04-4461-b771-000ead4ac773

I didn’t know about this phenomenon, obviously it can’t be detected in daylight, so it makes sense that it is only visible at night. It’s a rather spooky phenomenon but how long does this effect last for before the quake happens? That would be useful information.