Volcano Monitoring Animations #1: Volcano Deformation

One of the things moving magma tends to do,
is that it tends to deform the surface of the Earth. It tends to cause the surface to bulge upward
or to spread apart. One of the instruments we use to measure deformation
is a tiltmeter. A tiltmeter measures very subtle changes in
the surface of the Earth — as magma accumulates beneath a station or moves upward, for example. Another instrument we use is the Global Positioning
System or GPS. We put several of them out on the volcano. We record signals from satellites orbiting
above the earth and we look for movement of one of the station with respect to the other. As the ground deforms, the volcano changes
its shape, those stations move; and that tells us something about what is going on beneath
the surface.

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