Volcanic Gas

Gas released from a volcano relates directly to the type, amount, and depth of magma beneath the surface. Scientists measure the types and amounts of different volcanic gases to better understand a volcano's behavior. An increase in gas output or a change in the chemical make up of the gases can be some of the first above-ground signs of an increase in volcanic activity.

New techniques for monitoring volcanoes and instruments that take advantage of new technologies are often employed by volcanologists when they are affordable and minimize exposure of personnel to hazards.