- Before an eruption, magma moves into the area beneath the volcano
- It collects in a magma chamber
- The movement of magma produces small earthquakes+ vibrations
- Seismometer- measures ground vibrations caused by earthquakes+ converts them to radio signals
- These signals are transmitted to computers that record the earthquakes 24/7
- Tiltmeters- measure changes in the slope angle/ tilt of the ground
E.g. In Montserrat, 14 seismometers close to the volcano record ground movements
5 electronic tiltmeters record ground movement on the slopes of Soufriere Hills volcano on Montserrat.
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