Subtle changes in a regional magnetic field, the earth's ionosphere or other physical phenomena may portend a major earthquake, according to emerging research. ...After a major quake in the greater San Francisco Bay Area in 1989, scientists at Stanford University, looking retroactively at data from a magnetometer, noted that two weeks before the quake, electromagnetic readings for an area near one of the faults active in the quake jumped significantly. Three hours before the quake, the readings from an electromagnetic field rose to 60 times the normal level. "A rock, when you squeeze it, becomes a battery," he said.

It all makes sense! Changes in the electromagnetic field can be picked up by animals, explaining their "sixth sense" regarding earthquakes. The same changes can cause lights to appear in the sky. The combination of the lights and humans sensitive to electromagnetic field causes folk to believe they saw a UFO. Deveraux has proven that UFO sightings in the UK appear predominantly along fault lines.

Source: CNet