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What does monitoring gases do?
Help predict the eruption of a volcano
What does an increase in Sulfur dioxide indicate?
Magma is rising closer to the surface
What does a sudden drop in gas levels suggest?
A major eruption may take place
Is monitoring gases effective?
Yes
Where is gas monitoring used?
All over the world - such as Japan, New Zealand and Italy
Where is gas monitoring crucial?
Hawaii, Alaska and Monserrat
What volcano has used gas monitoring?
Mt St Helens
When was gas monitoring first instigated?
Late 1700s
How much can gas monitoring cost?
A few thousand dollars