Volcanic fog—vog—swirls around the Hawaiian Islands in this satellite image. Vog is formed when sulfur dioxide gas emitted from a volcano reacts with oxygen and water vapor. The reactions form tiny drops of sulfuric acid and other sulfates, which create a visible haze. Since March 12, 2008, emissions of sulfur dioxide (the gas that forms vog) from Kilauea volcano have been elevated: 800 metric tons (1,800,000 pounds) per day in early December 2009, compared to an average of 140 metric tons per day (310,000 pounds) from 2003–2007.
- United States Geological Survey Hawaiian Volcano Observatory. (2009, December 10.) Recent Kilauea Status Reports, Updates, and Information Releases. Accessed December 10, 2009.
- United States Geological Survey. (2000, June.) Volcanic Air Pollution—A Hazard in Hawaii. Accessed December 10, 2009.
NASA image by Jeff Schmaltz, MODIS Rapid Response, Goddard Space Flight Center.
- Terra - MODIS