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Parameter Tree:
EARTH SCIENCE SERVICES > ENVIRONMENTAL ADVISORIES > GEOLOGICAL ADVISORIES > VOLCANIC ACTIVITY
Definition:
Activity pertaining to a vent in the surface of the Earth through which magma
and associated gases and ash erupt.

A Volcanic Activity Advisory may include reports on erupting volcanoes,
seismic/GPS information that may predict a pending eruption, and volcanic ash.
Reference:
Jackson, Julia A. (1997) Glossary of Geology, 4th Edition. Alexandria,
VA:American Geological Institute, 769 p.


For an example, see: http://www.ssd.noaa.gov/VAAC/washington.html

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