"Earthquake lights occur before, during and after earthquakes. They are cool and quiet, colored white or blue or red. They are usually dim, but sometimes are brighter than moonlight.
They take various forms: globes, bands, rays, sheets, clouds. They tend to rise from the ground. They have been reported at sea. They may flicker or shine steadily. They may be silent or accompanied by a crackling or bristling sound. Sometimes light boils from the ground like flames. They may be as brief as lightning or glow for several minutes.
Earthquake lights have been accompanied by low-frequency radio noise in the 10 to 20 kHz range.
Earthquake lights have been seen weeks before or after earthquakes and hundreds of kilometers from the epicenter. "