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ABOUT NATURE
Earthquakes Happen
Earthquake is one of the most
destroying natural disasters.
Unluckily it often happens in several regions. Recently
a horrible earthquake has shaken West Sumatra.
It has brought great damages. Why did it occur?
Do you know how an earthquake happens?
Earthquakes are usually caused when
rock underground suddenly breaks along a
fault. This sudden release
of energy causes the seismic waves. It 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 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 is called the epicenter of the earthquake.
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