Why Do Earthquakes Happen?
Earthquakes are
usually caused when rock underground suddenly breaks along a fault. This sudden
release of energy causes the seismic waves that make the ground shake. When two blocks of rock or two plates are rubbing
against each other, they
stick a little. They don't just slide smoothly; the rocks catch on each other.
The rocks are still pushing against each other, but not moving. After a while,
the rocks break because of all the pressure that's built up. When the rocks
break, the earthquake occurs.
During the earthquake
and afterward, the plates or blocks of rock start moving, and they continue to
move until they get stuck again. The spot underground where the rock breaks is
called the focus of the earthquake. The place right above the focus (on top of
the ground) is called the epicenter of the earthquake.
MichiganTechnologicalUniversity,Houghton,MI,49931-1295
wayne@mtu.edu
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