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Mount St. Helens, Washington State
A new dome started growing on October 18,1980. This October dome was 112 feet (34 meters) high and 985 feet (300 meters) wide, making it taller than a nine-story building and wider than the length of three football fields. This aerial view is from the north.
-- USGS Photo by Terry A. Leighley, USGS/Sandia Labs, October 24, 1980

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Mount St. Helens, Washington State
Mount St. Helens' lava dome grows in different ways. From 1980 through 1982 it grew in periodic extrusions of stubby lava flows, called lobes. This pattern changed in February 1983, when growth became continuous and mostly endogenous (internal). Perioidic lobe growth, along with endogenous growth, resumed in early 1984. An aerial view of the June 1981 lobe with its "spreading center" is shown here. A spreading center is the area from which new lava slowly emerges during lobe growth. Mount St. Helens' lobes grow at a rate of 3 to 10 feet per hour (1-3 m/hr)
-- USGS Photo by Daniel Dzurisin, June 26, 1981

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Mount St. Helens, Washington State
Aerial view, Mount St. Helens dome as seen from the south. Spirit Lake and Mount Rainier can be seen in the background.
-- USGS Photo by Lyn Topinka, April 15, 1983

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South Sister, Oregon
Aerial view, South Sister and line of volcanic domes.
-- USGS Photo by C. Dan Miller

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Novarupta, Alaska
Aerial view, Novarupta Dome, Katmai, Alaska.
-- USGS Photo by Gene Iwatsubo, July 29, 1987

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Inyo Domes, California
View north of Inyo Crater chain.
-- USGS Photo by C. Dan Miller, 1984

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