Images

View the annotated image.

View northward from Mount St. Helens' crater rim, July 2006.

Helicopter flying toward lava spine at Mount St. Helens to collect rocks—note the "Jaws" collector hanging underneath. April 28, 2007

Crater Lake is the remnant of Mount Mazama, which erupted catastrophically 7,700 years ago to form the caldera.Wizard Island in lake and Mount Scott is peak on right shore. View from south. Oregon

Due to the cataclysmic eruption of May 18, 1980, many of the locations annotated on this map are now either covered or no longer visible.

Eruptions of the Yellowstone volcanic system have included the two largest volcanic eruptions in North America in the past few million years; the third largest was at Long Valley in California and produced the Bishop ash bed. The biggest of the Yellowstone eruptions occurred 2.1 million years ago, depositing the Huckleberry Ridge ash bed.

USGS Debris-flow flume near Blue River, Oregon is used to conduct debris flows and landslide experiments. Flume is a reinforced concrete channel 95 m (310 ft long, 2 m (6.6 ft) wide, and 1.2 m (4 ft).

Mount Adams, Washington as seen from Mount St. Helens (west). Trees are covered in frost in the foreground.

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) and Mount Jefferson (right) on the horizon. June 8, 2005.

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.

Fumaroles steaming within Sherman Crater, Mount Baker, Washington.

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.

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.

Aerial view, Mount St. Helens' crater and dome, as seen from the northeast.

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.

Aerial view, Mount St. Helens' crater and dome, as seen from the northwest.

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.

Mount St. Helens' crater and dome, as seen from the northeast.

Whaleback structure (center) of dome withn Mount St. Helens' crater as seen from the northwest. January 24, 2005.

Crumbled sides of Mount St. Helens' dome, as seen from the northwest. January 24, 2005.