Photogeologic map of Mount St. Helens dome. Photograph annotated with identified features within the volcano's crater. November 7, 2004.
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Photogeologic map of Mount St. Helens dome. Photograph annotated wi...
Photogeologic map of Mount St. Helens dome. Photograph annotated with identified features within the volcano's crater. November 7, 2004.
Dome, steam, south crater wall, from Sep. Lobe: Mount St. Helens
Dome, steam, south crater wall, from September Lobe at Mount St. Helens.
Dome, steam, south crater wall, from September Lobe at Mount St. Helens.
Base of Mount St. Helens' new growth
Base of Mount St. Helens' new growth, from the east. Note prominent striations.
Base of Mount St. Helens' new growth, from the east. Note prominent striations.
Dome within Mount St. Helens' crater is hot and glowing as it grows...
Dome within Mount St. Helens' crater is hot and glowing as it grows, viewed from Johnston Ridge Observatory (JRO), with base of small steam and ash plume.
Dome within Mount St. Helens' crater is hot and glowing as it grows, viewed from Johnston Ridge Observatory (JRO), with base of small steam and ash plume.
Dome within Mount St. Helens' crater viewed from east Nov. 2005
Dome within Mount St. Helens' crater viewed from the east November 2004.
Dome within Mount St. Helens' crater viewed from the east November 2004.
Dome within Mount St. Helens' crater, Nov. 11, 2005
Dome within Mount St. Helens' crater, viewed from the east. November 11, 2005
Dome within Mount St. Helens' crater, viewed from the east. November 11, 2005
Mount St. Helens dome as seen from Sugar Bowl, on NE flank. Nov. 2005
Mount St. Helens dome as seen from Sugar Bowl, on the northeast flank. November 2005
Mount St. Helens dome as seen from Sugar Bowl, on the northeast flank. November 2005
Mount St. Helens with small plume, from south-SW.
Mount St. Helens with small plume, from south-southwest.
Mount St. Helens with small plume, from south-southwest.
Mount St. Helens' crater, dome, and new growth, from NE.
Mount St. Helens' crater, dome, and new growth, from the northeast.
Mount St. Helens' crater, dome, and new growth, from the northeast.
Mount St. Helens' new growth and plume
Mount St. Helens' new growth and plume. The red on the lower right is sun glare.
Mount St. Helens' new growth and plume. The red on the lower right is sun glare.
Mount St. Helens' new growth, from the east.
Mount St. Helens' new growth, from the east.
Mount St. Helens' new growth, from the east.
Mount St. Helens' new growth, from the east. Note prominent striations
Mount St. Helens' new growth, from the east. Note prominent striations.
Mount St. Helens' new growth, from the east. Note prominent striations.
Mount St. Helens' new growth, from the west.
Mount St. Helens' new growth, from the west.
Mount St. Helens' new growth, from the west.
Plume from Nov. 11, 2004 eruption of Mount St. Helens
Plume from November 11, 2004 eruption of Mount St. Helens, looking into the sun.
Plume from November 11, 2004 eruption of Mount St. Helens, looking into the sun.
USGS examine new rock samples from new growth on Mount St. Helens
USGS scientists examine new rock samples from the new growth on Mount St. Helens' dome.
USGS scientists examine new rock samples from the new growth on Mount St. Helens' dome.
Mount St. Helens: Instrumentation and Dome Growth, Oct 2004-Sept 2005
Following unrest that began on September 23, 2004 and the steam and ash eruptions in early October, extrusion of solid magma typified the 2004-2008 eruption at Mount St. Helens. The magma is unusually gas poor and crystal rich. Several meters of pulverized, variably sintered rock commonly coat the emergent lava spines, lending them a smooth appearance.
Following unrest that began on September 23, 2004 and the steam and ash eruptions in early October, extrusion of solid magma typified the 2004-2008 eruption at Mount St. Helens. The magma is unusually gas poor and crystal rich. Several meters of pulverized, variably sintered rock commonly coat the emergent lava spines, lending them a smooth appearance.
Mount St. Helens: Instrumentation and Dome Growth, Oct-Nov, 2004
On October 11, 2004, spines of solid, but still hot, lava punctured the surface of the deformed glacier, initiating a new dome-building phase of activity in the crater of Mount St. Helens. By late October, a larger whaleback-shaped extrusion of solid lava (called a spine) emerged from the crater floor.
On October 11, 2004, spines of solid, but still hot, lava punctured the surface of the deformed glacier, initiating a new dome-building phase of activity in the crater of Mount St. Helens. By late October, a larger whaleback-shaped extrusion of solid lava (called a spine) emerged from the crater floor.
Mount St. Helens: Steam, Ash Emissions and Dome Growth, October 2004
After two weeks of increasing seismicity, Mount St. Helens began erupting on October 1, 2004. The first of several explosions shot a plume of volcanic ash and gases into the atmosphere. Four additional steam and ash explosions occurred through October 5, and three produced noticeable fallout of fine ash downwind.
After two weeks of increasing seismicity, Mount St. Helens began erupting on October 1, 2004. The first of several explosions shot a plume of volcanic ash and gases into the atmosphere. Four additional steam and ash explosions occurred through October 5, and three produced noticeable fallout of fine ash downwind.
Maui silversword on Haleakalā volcano
A view of the stark landscape on Haleakalā volcano, Maui Island, Hawai‘i. Silverswords are an endangered endemic plant group threatened by browsing from invasive ungulates.
A view of the stark landscape on Haleakalā volcano, Maui Island, Hawai‘i. Silverswords are an endangered endemic plant group threatened by browsing from invasive ungulates.
Maui silversword on Haleakalā volcano
Beautifully striking contrast between the pale Maui silversword plant and the red volcanic rock of Haleakalā volcano.
Beautifully striking contrast between the pale Maui silversword plant and the red volcanic rock of Haleakalā volcano.
PubTalk 10/2004 — Hot Oil, Frozen Ground, and Earthquakes
The Trans-Alaska Pipeline story-- so far, so good!
by George Gryc, Arthur Lachenbruch, and Robert Page, Scientists Emeriti
The Trans-Alaska Pipeline story-- so far, so good!
by George Gryc, Arthur Lachenbruch, and Robert Page, Scientists Emeriti