Mysterious Flashes during the NAPA earthquake? What is it?

Mysterious Lights
Mysterious flashes of light in the sky were reported by several people during last Sunday’s magnitude 6.0 earthquake in the Napa region of northern California. Witnesses said the strange phenomenon looked like lightning and similar flashes of light have been reported in earthquakes around the world from Japan to Peru.
 

One scientist called this phenomenon “earthquake lights” and suggested they are a consequence of the stresses building up deep below the earth that cause an electric current to flow to the surface and burst through the earth. This typically happens before or during an earthquake. Most reports said there were one to two seconds between the light flashes. Research continues in this area – many seismologists do not believe such things are real.

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WHAT DO YOU MAKE OF THESE LIGHTS?