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First, quakes themselves are caused by abrupt shifts of rocks separated by a geological fault. It's these motions that generate the vibrations that we feel, and if they are strong enough, this results in property damage.
An earthquake usually begins with a roar, a sudden noise, and is then followed by those vibrations and the swaying sensation. Although vertical movement can occur, it's the horizontal movements that really generate the damage.
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Lynne Christen |