Images

A close-up view of one of the many breakouts of pāhoehoe on the Kahauale‘a 2 flow.

Repairs are made to an Acoustic Flow Monitor (AFM) located at the confluence of the North Fork Toutle River, Maratta, Castle and Coldwater Creeks, where the most recent lahar occurred in November, 2006. AFMs are installed to "hear" when lahars [muddy debris flows] move down channel so affected communities can be warned of the hazard.

The deep-sea drilling ship Chikyu, which will attempt to drill through the Moho [Image copyrighted by JAMSTEC. Used with permission].

Huckleberry Ridge Tuff deposit exposed on Mt. Everts, near the northern boundary of Yellowstone National Park. The deposit was created by ash falling from the plume early in the eruption sequence, 2.08 million years ago. Photo by Madison Myers, Montana State University.

The Kahauale‘a 2 flow is fed from a spatter cone, shown here, on the northeast edge of Pu‘u ‘Ō‘ō's crater floor. The spatter cone is about 8 m (26 ft) high.

Active breakouts on the Kahauale‘a 2 are scattered over a broad area. Here, a breakout near the edge of the forest engulfs trees and burns dead foliage.

The lava lake in Halema‘uma‘u has fallen slightly over the past few weeks. It is now about 55 m (180 ft) below the surrounding crater floor.

The lava lake in Halema‘uma‘u has fallen slightly over the past few weeks. It is now about 55 m (180 ft) below the surrounding crater floor.

All Hawaii residents are encouraged to participate in the Great Hawaii ShakeOut earthquake drill at 10:17 a.m. on October 17, 2013.

The Kahauale‘a 2 flow extends to the north and northeast of Pu‘u ‘Ō‘ō. From the edge of the flow, where it first reaches the forest, Pu‘u ‘Ō‘ō still appears to tower above the surrounding plain.

Active breakouts on the Kahauale‘a 2 are scattered over a broad area. Here, a breakout near the edge of the forest engulfs trees and burns dead foliage.

This beautiful bubble of glass, about the size of an small orange, adorns the surface of a breakout on the Kahauale‘a 2 flow. Note the delicate bubble walls stretched so thin that they grade from the color of honey to transparent.

The Kahauale‘a 2 flow extends to the north and northeast of Pu‘u ‘Ō‘ō. From the edge of the flow, where it first reaches the forest, Pu‘u ‘Ō‘ō still appears to tower above the surrounding plain.

Active breakouts on the Kahauale‘a 2 are scattered over a broad area. Here, a breakout near the edge of the forest engulfs trees and burns dead foliage.

The Kahauale‘a 2 flow extends to the north and northeast of Pu‘u ‘Ō‘ō. From the edge of the flow, where it first reaches the forest, Pu‘u ‘Ō‘ō still appears to tower above the surrounding plain.

This beautiful bubble of glass, about the size of an small orange, adorns the surface of a breakout on the Kahauale‘a 2 flow. Note the delicate bubble walls stretched so thin that they grade from the color of honey to transparent.

The lava lake in Halema‘uma‘u has fallen slightly over the past few weeks. It is now about 55 m (180 ft) below the surrounding crater floor.

This beautiful bubble of glass, about the size of an small orange, adorns the surface of a breakout on the Kahauale?a 2 flow. Note the delicate bubble walls stretched so thin that they grade from the c

Mount Scott fire lookout tower near Crater Lake, Oregon. Tower houses seismic and deformation monitoring instruments.

Geologists examine tephra deposits to better understand the early eruptive behavior of the Medicine Lake Volcano, evidence of which can be found as far away as central Oregon.

Glacier Peak volcano viewed from the west, Washington.