Images

Wave-driven flooding and overwash on Roi-Namur Atoll, Republic of the Marshall Islands

Mauve indicates areas at risk from lava flows and avalanches of hot rock and gases called pyroclastic flows. Bright red areas that fade to orange and yellow indicate potential routes for lahars (volcanic mudflows). Not shown are areas subject to hazards from volcanic ash.

Newberry Volcano, Oregon simplified hazards map showing potential impact area for ground-based hazards during a volcanic event.

Mount Adams, Washington simplified hazards map showing potential impact area for ground-based hazards during a volcanic event.

Three Sisters, Oregon simplified hazards map showing potential impact area for ground-based hazards during a volcanic event.

This map shows areas that could be affected by debris flows, lahars, lava flows, and pyroclastic flows from Mount Rainier if events similar in size to past events occurred today. Because small lahars are more common than large ones, most lahars would be less extensive than the hazard zone shown on the map and a few would be more extensive.

Wave-driven flooding and overwash on Roi-Namur Atoll, Republic of the Marshall Islands

Mount Hood, Oregon simplified hazards map showing potential impact area for ground-based hazards during a volcanic event.

Preview image for video: shows a time-lapse sequence of activity at the northeast spatter cone in Pu‘u ‘Ō‘ō crater on February 9-10. Rapid fluctuations in the height of the lava pond are caused by gas pistoning, which is the gradual buildup and release of gas in the pond. Mauna Kea is visible in the upper right portion of the frame.

This selection of images shows activity at the northeast spatter cone in Pu‘u ‘Ō‘ō over the past two weeks. The lava pond was undergoing gas pistoning, a gradual buildup and release of gas in the lava pond that is often associated with spattering and lava level changes. For scale, the lava pond is about 10 m (30 feet) across.

More images of the northeast spatter cone in Pu‘u ‘Ō‘ō, taken with a time-lapse camera.

Looking northeast from Pu‘u ‘Ō‘ō, the smoke coming from forest fires at the front of the Kahauale‘a 2 flow can be seen in the distance. In the foreground, thick fume is coming from the Kahauale‘a 2 lava tube, which is supplying lava to the flow front.

View of the northeast spatter cone in Pu‘u ‘Ō‘ō crater. This small cone is also the vent area for the Kahauale‘a 2 flow. The cone has recently hosted a small lava pond, but today this seemed to be crusted over. See the time-lapse sequences below to see recent activity at this cone.

Thermal image of the front of the Kahauale‘a 2 flow. Yellow and white areas depict active breakouts, while red areas are cooler, inactive portions of the flow. Over the past week a new lobe has pushed east, between lobes that were active in November and January. The tip of this new lobe was 7.4 km (4.6 miles) northeast of the vent on Pu‘u ‘Ō‘ō.

View of the flow front of the Kahauale‘a 2 flow, looking west. The flow front has focused into a new lobe that is slowly migrating through thick forest, triggering scattered forest fires. The smoke from these fires seems to be "seeding" the cloud above it. The active flow front was 7.4 km (4.6 miles) northeast of the vent on Pu‘u ‘Ō‘ō.

A wide view of activity from the east rift zone to the summit. In the foreground, Pu‘u ‘Ō‘ō crater emits fume from numerous sources on the crater floor. One of these cones hosts a small lava pond, and can be seen at the far right edge of the photo, marked by a small bit of incandescence.

A wide view of activity from the east rift zone to the summit. In the foreground, Pu‘u ‘Ō‘ō crater emits fume from numerous sources on the crater floor. One of these cones hosts a small lava pond, and can be seen at the far right edge of the photo, marked by a small bit of incandescence.

pāhoehoe breakouts were scattered at the far end of the Kahauale‘a 2 flow today, as far as 6.9 km (4.3 miles) from the vent on Pu‘u ‘Ō‘ō. This photo shows some typical activity on the Kahauale‘a 2 flow, with snow-covered Mauna Kea in the distance.

A closer view of the lava pond at the northeast spatter cone in Pu‘u ‘Ō‘ō crater. The pond is about 10 m (about 30 ft) wide, and was undergoing cycles of gas pistoning. The lava level would slowly and quietly rise a meter (yard) or more over about five minutes, and vigorous spattering would commence.

pāhoehoe breakouts were scattered at the far end of the Kahauale‘a 2 flow today, as far as 6.9 km (4.3 miles) from the vent on Pu‘u ‘Ō‘ō. This photo shows some typical activity on the Kahauale‘a 2 flow, with snow-covered Mauna Kea in the distance.

A close-up view of the lava pond in Pu‘u ‘Ō‘ō crater. The lava surface was quietly rising when this photo was taken. When the lava reached a critical level, vigorous spattering would begin at the large area of incandescence seen here. The rim of the lava pond is covered in a thick coating of spatter from similar events.