Volcano Hazards Program Office

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A close-up view of the west vent spatter cones and lava lake inlet in Halema‘uma‘u Crater at the summit of Kīlauea Volcano
April 26, 2021

Close-up view of the west vent and inlet at Halema‘uma‘u

A close-up view of the west vent spatter cones (bottom left) and inlet where lava is entering the lava lake (center right) in Halema‘uma‘u Crater at the summit of Kīlauea Volcano. A piece of crust, that solidified near the inlet, broke off and was being transported away from the inlet. This photograph was taken on April 26, 2021, at 1:51 p.m. HST from the west rim of

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Color photograph of lava lake surface
April 23, 2021

April 22, 2021- Close-up view of Halema‘uma‘u lava lake crusting-over

This zoomed-in photo of the far southwest end of the active lava lake within Halema‘uma‘u at Kīlauea's summit was captured on Thursday, April 22, and it illustrates the process by which parts of the lava lake become inactive. This area, which had seen substantial lava circulation as recently as last week, now has a stagnant pāhoehoe crust that sits 2–3 m (7–10 ft) lower

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Color map of lava
April 23, 2021

April 23, 2021—Kīlauea summit eruption contour map

This map of Halema‘uma‘u at the summit of Kīlauea shows 20 m (66 ft) contour lines (dark gray) that mark locations of equal elevation above sea level (asl). The map shows that the lava lake has filled 228 m (748 ft) of the crater, to an elevation of 745 m (2444 ft) asl since the eruption began on December 20, 2020. Contour lines highlighted in green, purple, and blue mark

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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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