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15 cards from this deck
Within 20km of volcano vent
Increased seismic activity from magma moving through crust
Seismometers and seismographs
Changes in mountain shape from magma/gas pressure
Ground deformation
Measures horizontal movement using laser signals
Detects slope changes like a spirit level
Changes in volcanic shape over time
1986
Over 1,700 people and 3,500 livestock
Cameroon
Electric pump system to degas CO2
Mt St Helens 1980, Mt Pinatubo 1992, Mt Merapi 2010
Seismic activity, ground deformation, gas emissions, historical records
Understand eruption history to predict future eruptions
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