• Question: How does an earthquake happen?

    Asked by slwebster997 to David on 21 Jun 2011.
    • Photo: David Ingram

      David Ingram answered on 21 Jun 2011:

      Force (from tectonic plates pushing together) builds up in rock layers underground, and eventually the rock fractures and the two sides of the break (fault) move in different directions.

      They are very hard to predict because the its difficult to know where the rock will fracture under the applied force.