Mount Hood dominates the skyline outside Portland, Oregon on a clear day. A major eruption of Mount Hood would pose a great hazard to the regional economy.
Images
Volcano Hazard Program images.
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Mount Hood
Mount Hood dominates the skyline outside Portland, Oregon on a clear day. A major eruption of Mount Hood would pose a great hazard to the regional economy.
Island of Hawai‘i map, showing Mauna Loa and the other four volcano...
Island of Hawai‘i map, showing Mauna Loa and the other four volcanoes that make up the island. Mauna Loa structural features include summit caldera, rift zones, radial vents, and historical lava flows.
Island of Hawai‘i map, showing Mauna Loa and the other four volcanoes that make up the island. Mauna Loa structural features include summit caldera, rift zones, radial vents, and historical lava flows.
Turbine from Agoyan hydroelectric power plant with severe abrasion ...
Tephra-laden water filtering through the turbines has necessitated the replacement of four turbines in 21 years. The Agoyan Dam and its (orange) floodgates are designed to let highly turbid water bypass the turbines so as to avoid accelerated wear of generation components
Tephra-laden water filtering through the turbines has necessitated the replacement of four turbines in 21 years. The Agoyan Dam and its (orange) floodgates are designed to let highly turbid water bypass the turbines so as to avoid accelerated wear of generation components
Summary of Impacts
Summary of power system impacts following 12 historic eruptions.
Summary of power system impacts following 12 historic eruptions.
Mount St. Helens and the industrial waterfront area of North Portla...
Mount St. Helens and the industrial waterfront area of North Portland, Oregon along the Willamette River in the foreground. Excess sediment from volcanoes can significantly impact river traffic.
Mount St. Helens and the industrial waterfront area of North Portland, Oregon along the Willamette River in the foreground. Excess sediment from volcanoes can significantly impact river traffic.
Mount Hood looms above the Columbia River and Glenn Jackson Bridge....
Mount Hood looms above the Columbia River and Glenn Jackson Bridge. Excess sediment from eruptions of Mount Hood have choked the river and caused flooding in the past.
Mount Hood looms above the Columbia River and Glenn Jackson Bridge. Excess sediment from eruptions of Mount Hood have choked the river and caused flooding in the past.
The Kīlauea Visit that was a Prelude to Revolution
"Stevens and Party at Kīlauea" - U.S. Minister Stevens is second from the right. Demosthenes Lycurgus and Alex Lancaster are first and second from the left, respectively.
"Stevens and Party at Kīlauea" - U.S. Minister Stevens is second from the right. Demosthenes Lycurgus and Alex Lancaster are first and second from the left, respectively.
Ocean entry and coastal plain breakouts remain active
The ocean entry (at center of image) near Kupapa`u remains active, with a weak and wispy plume. The light colored area on the coastal plain shows the recently active flows.
The ocean entry (at center of image) near Kupapa`u remains active, with a weak and wispy plume. The light colored area on the coastal plain shows the recently active flows.
scattered breakouts on the coastal plain and the ocean entry near K...
This thermal image shows the scattered breakouts on the coastal plain and the ocean entry near Kupapa`u. In addition to these coastal plain flows, several breakouts were active near the top of the pali, around the northern boundary of Royal Gardens subdivision.
This thermal image shows the scattered breakouts on the coastal plain and the ocean entry near Kupapa`u. In addition to these coastal plain flows, several breakouts were active near the top of the pali, around the northern boundary of Royal Gardens subdivision.
ocean entry, with weak plumes originating from several spots along ...
A closer view of the ocean entry, with weak plumes originating from several spots along the coast.
A closer view of the ocean entry, with weak plumes originating from several spots along the coast.
A small collapse this morning of the spatter cone that had built up...
A small collapse this morning of the spatter cone that had built up around the northeast lava pond in Pu‘u ‘Ō‘ō resulted in a brief gush of lava onto the crater floor.
A small collapse this morning of the spatter cone that had built up around the northeast lava pond in Pu‘u ‘Ō‘ō resulted in a brief gush of lava onto the crater floor.
Thomas Jaggar and his wife, Isabel, hiking on Mauna Loa during the ...
Thomas Jaggar and his wife, Isabel, hiking on Mauna Loa during the September 1919 Southwest Rift Zone eruption.
Thomas Jaggar and his wife, Isabel, hiking on Mauna Loa during the September 1919 Southwest Rift Zone eruption.
As HVO's centennial year ends, New Year of volcanic milestones begins
A highlight of HVO's 100th anniversary in 2012 was the Centennial Poster Contest for Hawai‘i Island 4th grade students. The poster shown here was created by Jyron Young, who was awarded the Grand Prize for his artistic depiction of 100 years of volcano watching in Hawai‘i. Image courtesy of USGS.
A highlight of HVO's 100th anniversary in 2012 was the Centennial Poster Contest for Hawai‘i Island 4th grade students. The poster shown here was created by Jyron Young, who was awarded the Grand Prize for his artistic depiction of 100 years of volcano watching in Hawai‘i. Image courtesy of USGS.
Crater Lake combined digital elevation and bathymetric map showing ...
Crater Lake partially fills the caldera that formed approximately 7,700 years ago during the eruption of a 12,000-ft-high volcano known as Mount Mazama.
Crater Lake partially fills the caldera that formed approximately 7,700 years ago during the eruption of a 12,000-ft-high volcano known as Mount Mazama.
Logs Floating in Spirit Lake, Mount St. Helens in the background.
Logs float in Spirit Lake near the Spirit Lake gaging station and outflow tunnel. View is to the south with Mount St. Helens in the background.
Logs float in Spirit Lake near the Spirit Lake gaging station and outflow tunnel. View is to the south with Mount St. Helens in the background.
North Fork Toutle River, Sediment Retention Struct., Mount St. Helens
The May 18, 1980 eruption of Mount St. Helens had a dramatic impact on the North Fork Toutle River. The debris avalanche, lateral blast and ashfall produced a substantial amount of sediment, which continues to be washed into the river and transported downstream.
The May 18, 1980 eruption of Mount St. Helens had a dramatic impact on the North Fork Toutle River. The debris avalanche, lateral blast and ashfall produced a substantial amount of sediment, which continues to be washed into the river and transported downstream.
Thermal images of small lava lake in Pu‘u ‘Ō‘ō
Thermal images of the small lava lake at the northeastern edge of the crater floor in Pu‘u ‘Ō‘ō. The view in the top image is to the northeast; the view in the bottom image is to southeast. The lava lake is about 20 m (65 ft) across.
Thermal images of the small lava lake at the northeastern edge of the crater floor in Pu‘u ‘Ō‘ō. The view in the top image is to the northeast; the view in the bottom image is to southeast. The lava lake is about 20 m (65 ft) across.
Thermal images of the Peace Day flow (episode 61) on the coastal pl...
Thermal images of the Peace Day flow (episode 61) on the coastal plain. The bright areas show active flows, while the darker purple areas show the warm but inactive part of the flow. The top image looks northwest; the bottom image looks north. The terminus of the flow was about 175 m (575 ft) from the ocean at mid-day.
Thermal images of the Peace Day flow (episode 61) on the coastal plain. The bright areas show active flows, while the darker purple areas show the warm but inactive part of the flow. The top image looks northwest; the bottom image looks north. The terminus of the flow was about 175 m (575 ft) from the ocean at mid-day.
Thermal images of Peace Day flow on coastal Plain
Thermal image panorama showing the Peace Day flow (episode 61) on the coastal plain. The view is to the southwest. The bright areas are active lava, while the less bright areas are warm but inactive flows.
Thermal image panorama showing the Peace Day flow (episode 61) on the coastal plain. The view is to the southwest. The bright areas are active lava, while the less bright areas are warm but inactive flows.
What can we learn from the lava level in Halema‘uma‘u?
Aerial view of spattering at the southwest edge of the lava lake below the inner ledge (within the fume) on November 1, 2012. The lake sits inside a smaller crater at the east edge of the floor of Halema‘uma‘u Crater.
Aerial view of spattering at the southwest edge of the lava lake below the inner ledge (within the fume) on November 1, 2012. The lake sits inside a smaller crater at the east edge of the floor of Halema‘uma‘u Crater.
Flows slowly advancing towards ocean along National Park boundary
The active flow front today was about 500 meters (0.3 miles) from the shoreline, and still running along the eastern boundary of Hawai‘i Volcanoes National Park. In this photo, the lava flow passes by another Park boundary marker.
The active flow front today was about 500 meters (0.3 miles) from the shoreline, and still running along the eastern boundary of Hawai‘i Volcanoes National Park. In this photo, the lava flow passes by another Park boundary marker.