An earthquake is a sudden, rapid shaking of
the Earth caused by the breaking and shifting of rock beneath the
Earth's surface. This shaking can cause buildings and bridges to
collapse; disrupt gas, electric, and phone service; and sometimes
trigger landslides, avalanches, flash floods, fires, and huge,
destructive ocean waves (tsunamis). Buildings with foundations resting
on unconsolidated landfill, old waterways, or other unstable soil are
most at risk. Buildings or trailers and manufactured homes not tied to a
reinforced foundation anchored to the ground are also at risk since they
can be shaken off their mountings during an earthquake. Earthquakes can
occur at any time of the year. |