Earthquakes
By Noor and Aranka
Characteristics
An
earthquake is a trembling if the
ground that result from the sudden
shifting of rock beneath the earth’s
crust.
Spatial distribution
Earthquakes
happen at the edges of
tectonic plates as they are the
effects if the plates moving against
or past each other.
Spatial extent
The
spatial extent of an earthquake
depends on the magnitude. When
the ground shaking affects areas 100
km or more from the epicentre, it is
considered a hazard.
Predictability
It
is very difficult to predict when an
earthquake will happen. Areas that
have experienced earthquakes
before are more likely to experience
another as this indicates active faults
Frequency & magnitude
Magnitude
8 and
higher
7 - 7.9
6 - 6.9
5 - 5.9
4 - 4.9
3 - 3.9
2 - 2.9
Average
Annually
1¹
15 ¹
134 ²
1319 ²
13,000
(estimated)
130,000
(estimated)
1,300,000
(estimated)
Duration
The
duration of an earthquake is
usually about a few minutes.
The duration of the effect can last
much longer though, varying on the
magnitude and destructing caused
by the earthquake.
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