Volcano Hazards Program Office

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Photographs of travertine in Yellowstone
April 22, 2021

Photographs of travertine in Yellowstone

Photographs of travertine in Yellowstone. A) Travertine terraces actively forming at Mammoth Hot Springs. B) A few miles south of Mammoth Hot Springs, near Silver Gate, the highway passes through a landslide deposit composed of travertine blocks from Terrace Mountain; these travertines formed

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Location of major travertine deposits in Yellowstone National Park
April 22, 2021

Location of major travertine deposits in Yellowstone National Park

Map of Yellowstone National Park showing the location of major travertine deposits. The green dashed line is the outline of Yellowstone Caldera and red lines are major paved roads.

Travertine sample from Yellowstone National Park
April 22, 2021

Travertine sample from Yellowstone National Park

Travertine sample from the Hillside Springs Group in Upper Geyser Basin, sampled under permit YELL-2020-SCI-8030. (Left) Cut and polished sample slab showing the different layers of travertine; dashed circles indicate where subsamples were taken for geochronology analysis. (Middle) Sample viewed under shortwave infrared light, where the bright green layers indicate higher

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Color photograph of lava lake
April 22, 2021

April 22, 2021 — Kīlauea summit lava lake

On Thursday, April 22, HVO scientists observed the ongoing eruption at the Kīlauea summit from the south rim of Halema‘uma‘u. This photo shows the active western portion of the lava lake, which appears to be in the process of shrinking again, with its northeast (upper-right) and southwest (lower-left) ends crusting over substantially. For scale, the distance from the

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Color photograph of volcanic vent
April 21, 2021

April 20, 2021 — Kīlauea vent

A telephoto view of the west vent and lava lake inlet within Halema‘uma‘u crater at the summit of Kīlauea. Lava erupting from the west vent (upper left) continues to feed into the active lava lake through a wide inlet near the base of the cone (center right). This photo was taken from the south rim of Halema‘uma‘u crater, in an area of Hawai‘i Volcanoes National Park that

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Color photograph of lava lake
April 21, 2021

April 20, 2021 — Kīlauea lava lake

Lava continues to erupt from the west vent within Halema‘uma‘u crater and feed the active lava lake at Kīlauea summit. Volcanic gas emissions from the west vent (lower left) remain elevated and were last measured on April 14 at about 950 t/d. This photo was taken from the west rim of Halema‘uma‘u, in an area of Hawai‘i Volcanoes National Park that remains closed to the

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Color photograph of lava lake
April 21, 2021

April 20, 2021 — Kīlauea lava lake and rocks

A telephoto view of the southern lava lake crust and Halema‘uma‘u crater wall at the summit of Kīlauea. Many rockfalls from the steep and unstable crater walls of Halema‘uma‘u have deposited large boulders onto the stagnant lava surface over the past few months. This photo was taken from the west rim of Halema‘uma‘u looking southeast. USGS photo taken by L. DeSmither on

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Color photograph of lava lake
April 21, 2021

April 20, 2021 — Kīlauea lava lake and island

A telephoto view of the northwestern point of the main island within Halema‘uma‘u crater, at Kīlauea summit. A rockfall scar (center left) remains after a small collapse of the island was observed by field geologists around 12:43 p.m. HST on April 20, 2021. A sliver of the active lava lake surface is visible at the bottom of this photo. USGS photo taken from the west rim

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Color photograph of lava lake
April 21, 2021

April 21 - Halema‘uma‘u crater

A view of Halema‘uma‘u crater at the summit of Kīlauea Volcano, Island of Hawai‘i, showing the active western fissure with rising fumes, the active western portion of the lava lake (lighter colored area in the middle of the photo), and the big island within the lava lake (right). Lava continues to enter the active lava lake and currently has an effusion rate of less than

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April 20, 2021

Mitigating Hazards at Cascade Range Volcanoes

The 1980 eruption of Mount St. Helens was monumental in so many different ways. It had a huge impact on the geography of southwestern Washington, ash affected many people, lives were lost, and lessons were learned. The eruption also led to the creation of the USGS Cascades Volcano Observatory in Vancouver, Washington. Seth Moran talks about three of CVO’s mission areas—

Color animated gif of lava lake rise
April 20, 2021

Kīlauea summit eruption four-month anniversary

April 20 was the four-month anniversary of Kīlauea's ongoing summit eruption in Halema‘uma‘u. This animated GIF features approximately one thermal image for each day of the eruption and demonstrates eruptive activity over the past four months. At 9:30 p.m. HST on December 20, 2020, vents opened in the northwest and north walls of Halema‘uma‘u, erupting lava and vaporizing

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April 17, 2021

Kīlauea Summit Lava Lake (April 17, 2021)

The lava lake in Halema‘uma‘u Crater, at the summit of Kīlauea Volcano, remains active. This video is shown at 30x speed and shows the lava supplying the lake from the western fissure, with scattered crustal foundering across the lake surface.