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Tsunami Hazard Zone Sign

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The lava lake in Halema‘uma‘u crater, at the summit of Kīlauea, remains active, as seen in this view looking north. Active surface lava is limited to the western (left) portion of the lake between the main island and the western fissure complex.

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.

On Monday, April 26, 2021, lava continued to flow from the western vent (bottom left) into the active lava lake (center) in Halema‘uma‘u Crater at the summit of Kīlauea Volcano. The active lava lake surface continues to shrink as areas on the north (upper left) and south (center right) sides cool and solidify. This photograph was taken at 1:03 p.m.

This Landsat 8 Collection 2 image was acquired over the Richat Structure near the western edge of the Sahara Desert on April 25, 2020 and is shown as a natural color composite using the red, green, and blue bands (Bands 4,3,2).

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 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.

Delta wetland near Rio Vista, California.

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.

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.

Photographs of travertine in Yellowstone. A) Travertine terraces actively forming at Mammoth Hot Springs.

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.

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.