Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock () or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
Volcano Hazard Program images.
The CVO Sediment Laboratory works closely with scientist in providing authentic and reliable data to support their research.
The CVO Sediment Laboratory works closely with scientist in providing authentic and reliable data to support their research.
Center for the Study of Active Volcanoes (CSAV) students Javier Pacheco (Costa Rica) and Syegi Kunrat (Indonesia) participate in field studies at Mount St. Helens.
Center for the Study of Active Volcanoes (CSAV) students Javier Pacheco (Costa Rica) and Syegi Kunrat (Indonesia) participate in field studies at Mount St. Helens.
Several birds take a closer view of the ocean entry. Narrow streams of lava were battered by the surf as they poured into the water.
Several birds take a closer view of the ocean entry. Narrow streams of lava were battered by the surf as they poured into the water.
The ocean entry at Kupapa‘u Point remains active, with several lava steams entering the water creating a moderate plume.
The ocean entry at Kupapa‘u Point remains active, with several lava steams entering the water creating a moderate plume.
Island residents are encouraged to practice "Drop! Cover! Hold on!" during the Great Hawaii ShakeOut drill at 10:17 a.m. on October 17, 2013. Taking these actions during an earthquake will greatly reduce your risk of injury or death. For more information, please visit http://shakeout.org/hawaii/.
Island residents are encouraged to practice "Drop! Cover! Hold on!" during the Great Hawaii ShakeOut drill at 10:17 a.m. on October 17, 2013. Taking these actions during an earthquake will greatly reduce your risk of injury or death. For more information, please visit http://shakeout.org/hawaii/.
At Mount Baker, Washington, observers noted continuing landslide activity in the upper Middle Fork Nooksack drainage that resulted in small debris flows and muddy floods. Scientists from multiple agencies and institutions coordinated observations, surveying, and sampling to gain an understanding of the situation.
At Mount Baker, Washington, observers noted continuing landslide activity in the upper Middle Fork Nooksack drainage that resulted in small debris flows and muddy floods. Scientists from multiple agencies and institutions coordinated observations, surveying, and sampling to gain an understanding of the situation.
This thermal image shows the eastern ocean entry at Kupapa‘u Point. Just inland from the entry point a patch of slightly warmer temperatures indicates an area of recent small breakouts.
This thermal image shows the eastern ocean entry at Kupapa‘u Point. Just inland from the entry point a patch of slightly warmer temperatures indicates an area of recent small breakouts.
On Kīlauea's East Rift Zone, the Kahauale'a 2 flow advances slowly into the Puna Forest Reserve. The Kahauale`a 2 flow began in early May, 2013, on the north side of the rift.
On Kīlauea's East Rift Zone, the Kahauale'a 2 flow advances slowly into the Puna Forest Reserve. The Kahauale`a 2 flow began in early May, 2013, on the north side of the rift.
The Kahauale‘a 2 flow, which is active north of Pu‘u ‘Ō‘ō, is fed from a vent at this cone on the northeast rim of Pu‘u ‘Ō‘ō crater. Small openings at the top of the cone contain sloshing lava, and two skylights at the very start of the Kahauale‘a 2 lava tube provided views of a swiftly moving lava stream rushing downslope.
The Kahauale‘a 2 flow, which is active north of Pu‘u ‘Ō‘ō, is fed from a vent at this cone on the northeast rim of Pu‘u ‘Ō‘ō crater. Small openings at the top of the cone contain sloshing lava, and two skylights at the very start of the Kahauale‘a 2 lava tube provided views of a swiftly moving lava stream rushing downslope.
A wider view of a portion of the Kahauale‘a 2 flow margin at the forest boundary.
A wider view of a portion of the Kahauale‘a 2 flow margin at the forest boundary.
Carbon dioxide gas detection instrument installed at Horseshoe Lake, Mammoth Mountain, California.
Carbon dioxide gas detection instrument installed at Horseshoe Lake, Mammoth Mountain, California.
Teachers take a guided walk on the Hummocks Trail, learning about the depositional features of the May 18, 1980 eruption.
Teachers take a guided walk on the Hummocks Trail, learning about the depositional features of the May 18, 1980 eruption.
Todd Cullings, with the Mount St. Helens National Volcanic Monument, leads teachers in activities they can do with students before hiking the Hummocks Trail.
Todd Cullings, with the Mount St. Helens National Volcanic Monument, leads teachers in activities they can do with students before hiking the Hummocks Trail.
This geologic map of Mauna Loa shows surface flows that have been mapped as of 2013. The flows are color-coded to reflect age. Warm colors indicate younger flows, with red indicating flows erupted since 1832. Cooler colors indicate older flows, such as at South Point, which is covered by flows ranging from 7,000 to more than 21,000 years old (blues and purple).
This geologic map of Mauna Loa shows surface flows that have been mapped as of 2013. The flows are color-coded to reflect age. Warm colors indicate younger flows, with red indicating flows erupted since 1832. Cooler colors indicate older flows, such as at South Point, which is covered by flows ranging from 7,000 to more than 21,000 years old (blues and purple).
To better understand the physics of debris flows and to make more accurate hazards forecasts in the natural environment, scientists perform controlled experiments at the large-scale USGS debris flow flume facility.
To better understand the physics of debris flows and to make more accurate hazards forecasts in the natural environment, scientists perform controlled experiments at the large-scale USGS debris flow flume facility.
A close-up of the Kahauale‘a II flow burning vegetation at the forest line, just north of Pu‘u ‘Ō‘ō. The flow consists of numerous slow-moving pāhoehoe lobes.
A close-up of the Kahauale‘a II flow burning vegetation at the forest line, just north of Pu‘u ‘Ō‘ō. The flow consists of numerous slow-moving pāhoehoe lobes.
Two ocean entry points remain active near Kupapa‘u Point, near the boundary of Hawai‘i Volcanoes National Park. The eastern entry has produced a larger plume than that at the western entry, which tends to be weak and wispy.
Two ocean entry points remain active near Kupapa‘u Point, near the boundary of Hawai‘i Volcanoes National Park. The eastern entry has produced a larger plume than that at the western entry, which tends to be weak and wispy.
This photo looks south towards Pu‘u ‘Ō‘ō, where a vent is supplying lava to the Kahauale‘a II flow, north of the cone. This slow-moving flow has reached the forest line, producing small scattered brush fires.
This photo looks south towards Pu‘u ‘Ō‘ō, where a vent is supplying lava to the Kahauale‘a II flow, north of the cone. This slow-moving flow has reached the forest line, producing small scattered brush fires.
This photo looks south towards Pu‘u ‘Ō‘ō, where a vent is supplying lava to the Kahauale‘a II flow, north of the cone. This slow-moving flow has reached the forest line, producing small scattered brush fires.
This photo looks south towards Pu‘u ‘Ō‘ō, where a vent is supplying lava to the Kahauale‘a II flow, north of the cone. This slow-moving flow has reached the forest line, producing small scattered brush fires.
The summit eruption in Halema‘uma‘u crater remains active. The lava lake is within the Overlook crater (the source of the gas plume), which is in the southeast portion of Halema‘uma‘u Crater.
The summit eruption in Halema‘uma‘u crater remains active. The lava lake is within the Overlook crater (the source of the gas plume), which is in the southeast portion of Halema‘uma‘u Crater.
Pagan Volcano is the largest and one of the most active volcanoes in the Northern Mariana Islands. Prior to 2013, the volcano was not monitored with any ground-based instruments, so activity was observed only by satellite or by the few island inhabitants. Although geographically remote, eruptions from Pagan can threaten international air traffic.
Pagan Volcano is the largest and one of the most active volcanoes in the Northern Mariana Islands. Prior to 2013, the volcano was not monitored with any ground-based instruments, so activity was observed only by satellite or by the few island inhabitants. Although geographically remote, eruptions from Pagan can threaten international air traffic.