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3 answers

1. increase of seismic activity and upward movement of magma
2. study of ground deformation. When magma moves up it takes up space and pushes the surrounding rock outward. This also causes the surface of the volcano to deform.
3. monitoring gases that come out of fumaroles. Increase in temperature might be a sign that magma has moved closer to the surface.
4. topography from satellite data. Increases or decreases in temperatures can be detected.

2007-10-23 15:36:44 · answer #1 · answered by claudiacake 7 · 0 0

activity spikes below the surface of the earth where the pressure and magma build up?

2007-10-23 15:24:48 · answer #2 · answered by cafeene_rush21 3 · 0 0

I think some are: patterns of erruptions, earthqukes, but i don't know the rest

2007-10-23 15:24:52 · answer #3 · answered by ¡•ziggy•¡ 3 · 0 0

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