Earthquakes are usually caused by the movement of a land mass moving past another land mass. The sudden release of built up energy sends seismic waves out in all directions. The more powerful ones can cause significant damage.
Geology of Hawaiian Islands GG 103 Drill on Earthquake Safety "Drop! Cover! Hold on!"
The earthquake"Shake Out!"
When the Earth Shakes - Animated Video
When the Earth shakes, the ground moves and things start to fall, you'll ask yourself 'how prepared or unprepared are you?'
Resilient Japan: The Never-Ending Effort for Earthquake Safety (1:00 min)
Living with Earthquakes in Hawaii (35.28 Min)