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Monitoring
Volcanoes
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| Scientists
monitor volcano in different ways. Each way helps them to understand
how volcanoes act and how they affect the water, land, and animal
life on Earth. |
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| It is important for scientists
to know what a volcano is doing. Volcanoes act in certain ways before
erupting. Scientists look for ways to tell when a volcano is about
to erupt by studying how the magma below the volcano is moving. If
the magma is rising three things begin to happen. First, earthquakes
and other seismic activity begins. Second, the volcano begins to get
larger at the top or back side. Third, volcanic gasses are released
from vents. These three events help scientists know when the volcano
is about to erupt. If a volcano begins to act like it is going to
erupt scientists visit the volcano to study it 24 hours a day.Different
kinds of scientists work together to see how the volcano affects the
land, water, and animal life before and after an eruption. |
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| Seismographs
help scientists monitor volcanoes by telling them when an earthquake
ocurrs or when more earthquakes begin to happen than normal. |
Seismometers like the one above can
monitor earthquakes beneath the volcano. |
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Seismograms
measure how often earthquakes that happen before a volcano
erupt and afterwards.
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| There
are four different kinds of seismograms. They measure the strength
of the movement of the earth at different levels in the Earth's
crust.
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