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Loowit Falls flows north out of Mount St. Helens crater. White buil...
August 26, 2005

Loowit Falls flows north out of Mount St. Helens crater. White buil...

Loowit Falls flows north out of Mount St. Helens crater. White building in upper right corner is the Loowit gage house, which contains an Acoustic Flow Monitor.

South-facing aerial view of Mount St. Helens with Mount Hood (left)...
June 8, 2005

South-facing Mount St. Helens with Mount Hood and Mount Jefferson o...

South-facing aerial view of Mount St. Helens with Mount Hood (left) and Mount Jefferson (right) on the horizon. June 8, 2005.

April 30, 2005

Mount St. Helens: Instrumentation and Dome Growth, April - July 2005.

Lava spines continue to emerge onto the crater floor of Mount St. Helens in 2005. By April 2005, spine 4 is broken and pushed away by spine 5.  The nearly vertical spine 5 has a smooth, gouge-covered surface, growing at an average rate of 4.3 meters per day. Scientists continue helicopter overflights to measure the temperature of the lava dome and assess hazards from dome

Ash collection from east Crater Glacier on Mount St. Helens with a ...
April 10, 2005

Ash collection from east Crater Glacier on Mount St. Helens with a ...

Ash collection from east Crater Glacier on Mount St. Helens with a dredge attached to a helicopter cable. Ash is analyzed to help scientists understand eruption characteristics.

Landslide from May 18, 1980, eruption of Mount St. Helens blocks ou...
March 11, 2005

Landslide from May 18, 1980, eruption of Mount St. Helens

The May 18, 1980 eruption of Mount St. Helens began with an enormous landslide that slammed into Spirit Lake, blocking its natural outlet and raising the lake level by 197 feet.

To mitigate downstream flood hazards, in 1984-1985, the U.S. Army Corps of Engineers constructed an 8,500 foot long, 11 foot diameter tunnel through a bedrock ridge on the west side of

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February 28, 2005

Mount St. Helens: Instrumentation and Dome Growth, Feb - Mar 15, 2005

Growth and disintegration of lava spines continued at Mount St. Helens through the first 8 months of 2005. Rather than building a single dome-shaped structure, the new dome grew initially as a series of recumbent, smoothly surfaced spines that extruded to lengths of almost 500 m. The potential for unpredictable explosions induced decisions to minimize the exposure of field

January 31, 2005

Mount St. Helens: Instrumentation and Dome Growth, January 2005

Within the crater of Mount St. Helens, the 2004–2008 lava dome grew by continuous extrusion of degassed lava spines. To track growth and anticipate what the volcano might do next, scientists installed monitoring equipment, including a camera and gas sensing instruments, and made helicopter overflights to collect the temperature (FLIR) of the growing dome.
 

Aerial view, Mount St. Helens' crater and dome, as seen from the no...
January 30, 2005

Aerial view, Mount St. Helens' crater and dome, as seen from NE. No...

Aerial view, Mount St. Helens' crater and dome, as seen from the northeast. Note dusting of ash on Mount St. Helens' flank, left near rim.

Whaleback structure (center) of dome withn Mount St. Helens' crater...
January 30, 2005

Whaleback structure of dome withn Mount St. Helens' crater. Dome is...

Whaleback structure (center) of dome withn Mount St. Helens' crater. Dome is crumbling to right and glacier is uplifted to the left, view from the north. January 30, 2005.

Lava domes within Mount St. Helens' crater, as seen from the northw...
January 24, 2005

Lava domes within Mount St. Helens' crater, as seen from NW. The 19...

Lava domes within Mount St. Helens' crater, as seen from the northwest. The 1980-86 dome is in the crater on the left and the new 2004-05 dome is on the right.