Griggs (top left) is a Holocene stratovolcano. Griggs has not erupted in historical time. The Valley of Ten Thousand Smokes is in the foreground. Griggs sits 6 miles (10 km) back from the main line of volcanoes the define the Aleutian arc in Katmai National Park.
Near the summit of Griggs. Mageik and Martin volcanoes are in the background.
Although Griggs has not erupted in historical time there are active fumaroles near the summit of the volcano. The roar from the gas as it shots from these vents can be heard on the valley floor.
Sources of Information:
Hildreth, W., 1987, New perspectives on the eruption of 1912 in the Valley of Ten Thousand Smokes, Katmai National Park, Alaska: Bulletin of Volcanology, v. 49, p. 680-693.
Kosco, D.G., 1981, Characteristics of andesitic to dacitic volcanism at Katmai National Park, Alaska: Ph.D. thesis, Univeristy of California at Berkeley, 249 p.
Simkin, T., and Siebert, L., 1994, Volcanoes of the World: Geoscience Press, Tucson, Arizona, 349 p.
Wood, C.A., and Kienle, J., 1993, Volcanoes of North America: Cambridge University Press, New York, 354 p.