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IX. Damage considerable in specially designed structures; well-designed frame structures thrown out of plumb. Damage great in substantial buildings, with partial collapse. Buildings shifted off foundations.
Magnitude measures the energy released at the source of the earthquake.
Intensity measures the strength of shaking produced by the earthquake at a certain location.
Several people called the KPIX 5 newsroom after Sunday morning’s magnitude 6.0 earthquake in Napa, reporting mysterious flashes of light in the sky. Witnesses said the strange phenomenon looked like lightning.
Similar flashes of light have been reported in earthquakes around the world, from Japan to Peru.
Freund says common forms of earthquake lights include bluish flames that appear to come out of the ground at ankle height;
originally posted by: Jennyfrenzy
Here a video from the wine train station. You can see the flashes in the background, those are coming from the direction of the epicenter and were the earthquake lights people reported seeing.
It also gives you an idea about the level of shaking, it was pretty violent.
ETA to add images:
Screencap of the blue lights people reported seeing.
This are a line of weird clouds I captured in the sky just a bit ago, other wise blue sky, maybe I'm being paranoid but are those earthquake clouds?!