Why do they happen?
and this is what causes earthquakes.
Earthquakes are measured on the Richter Scale.
The higher the
number on the scale,
the more powerful the quake.
The more powerful a quake is,
the more damage it can cause. Earthquakes have killed hundreds of thousands of
people even though scientists are able to
make buildings much safer than in the past. Unfortunately many quakes happen in parts of
the world where people can't afford
to spend lots of money on safety measures.
or they happen at sea or places where there are no people.
Why is it dangerous after a quake?
Earthquakes are often followed by aftershocks. These are smaller quakes which bring more
damage to already weakened buildings and roads. Land, especially hills, can also be damaged by earthquakes
and can result devastating landslides and mudslides. After the El Salvador earthquake in 2001,
a landslide hit the small town of Las Colinas. It buried 500 houses and killed 315 people.
Many more were never found.
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