[Graphic,37K,InlineGIF]
Different Volcano Types
-- Flood Basalt, Shield Volcano, Cinder Cone, Stratovolcano, Lava Dome, Caldera
-- Modified from: Allen, 1975

[Schematic,22K,GIF]
Dome Growth 1980-83 - Ground Profile -- Taken from tracings of photographs from fixed photo station on crater floor, approximately 1 kilometer north of center of dome. Products of each extrusive episode include talus that accumulated during that episode. Scale varies owing to perspective view; true east-west basal diameter of dome in December 1983 was about 830 meters.
-- Modified from: Swanson, et.al., 1987, IN: GSA Special Paper 212

[Schematic,10K,GIF]
Dome Growth 1980-86 - Yearly Ground Profile -- Taken from tracings of photographs from fixed photo station on crater floor, approximately 1 kilometer north of center of dome. Includes accumulated talus. Scale varies owing to perspective view. Approximate 1986 east-west basal diameter of dome was about 860 meters.
-- Modified from: Topinka, 1992, IN: USGS Bulletin 1966

[Schematic,14K,GIF]
Lobe Development 1980-81 - Aerial View -- Schematic drawings of lobe development in the growth of a lava dome, as traced off aerial photographs of Mount St. Helens Lava Dome, 1980-1981.
-- Modified from: Swanson, et.al., 1987, IN: GSA Special Paper 212

[Schematic,12K,GIF]
Emerging New Lobe, August 1982 -- Taken from tracings of photographs from photo station on crater floor, showing 1-day and 2-week intervals.
-- Modified from: Topinka, 1992, IN: USGS Bulletin 1966

[Map,22K,GIF]
Volcanic hazards at Mount Hood related to growth of a lava dome
-- From: Brantley and Scott, 1993

[Map,22K,GIF]
Volcanic hazards at Mount Hood related to growth of a lava dome near Crater Rock
-- From: Brantley and Scott, 1993

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