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This zoomed-in view of the western fissure within Halema‘uma‘u, at the summit of Kīlauea, was captured on October 11, 2021, through the lens of a laser rangefinder. A prominent horseshoe-shaped spatter cone, measured to be standing 28 m (92 ft) above the adjacent lava lake, surrounds a roiling lava pond which also hosts taller fountains at times.

This zoomed-in view of the northwest side of the main island within the Halema‘uma‘u lava lake shows a "rootless lava flow" (silver) that formed in the early stages of the eruption on September 29, 2021.

Lava fountaining activity continues from the western vent in Halema‘uma‘u, within Kīlauea summit caldera, viewed at dusk on October 10, 2021, from the west rim of the crater. Only the western half of the lake surface is active; the eastern half is covered by a cooling, solidified crust. USGS image by B. Carr.

Fountaining at the western vent in Halema‘uma‘u crater, at Kīlauea volcano's summit, was approximately 15 meters (50 feet) high on the evening of October 10, 2021. Spatter from the fountaining would occasionally land on the wall of the vent cone and cool (visible on the right).

HVO scientists captured this zoomed-in photo of the western fissure within Halema‘uma‘u through the lens of a laser rangefinder on October 9, 2021. The fissure has formed a horseshoe-shaped spatter cone around its source, with an opening on the east (right) side allowing lava to flow into the active lava lake.

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On the morning of October 8, 2021, HVO scientists completed a routine helicopter overflight of the ongoing eruption within Halema‘uma‘u at the summit of Kīlauea.

In this overflight photo of the Halema‘uma‘u lava lake, captured on October 8, 2021 and looking from the northeast, two western fissures are visible: one inactive from the December 2020–May 2021 Kīlauea summit eruption (center), and another actively feeding lava into the lake at this time (upper-right).

Though not every ānuenue (rainbow) has an actively erupting volcanic fissure at its end, this one did for a brief moment during HVO scientists' helicopter overflight of the Kīlauea summit on the morning of October 8, 2021.

USGS scientist takes video of the erupting west vent within Halema‘uma‘u crater, at the summit of Kīlauea. Photo taken from the northwest rim of Halema‘uma‘u at 12:27 p.m. HST on Oct. 8, 2021. USGS photo by J.M. Chang.

A Koa‘e Kea (white-tailed tropicbird) flies above the erupting west vent within Halema‘uma‘u crater, at the summit of Kīlauea. Photo taken from the south rim of Halema‘uma‘u at 10:41 a.m. HST on Oct. 8, 2021. USGS photo by J.M. Chang. 

KWcam image taken on October 7, 2021, just after 6 a.m. HST. This image shows the ongoing eruption within Halemaʻumaʻu crater at the summit of Kīlauea. The eruption began the afternoon of September 29, 2021, as fissures in the floor of the crater; this activity is generating a lava lake that is slowly filling the crater.

A wide view of the ongoing Kīlauea summit eruption within Halema‘uma‘u, taken from the northwest rim of the crater. The west vent lava fountains (right) continues to supply lava into the slowly rising lava lake. Lava fountaining is no longer visible through the central and southern portions of the lava lake surface.

The eruption continues in Halema‘uma‘u crater, at the summit of Kīlauea. Lava fountaining no longer emerges from the central portion of the lake, with fountaining limited to the west vent shown here. Low fountaining within the cone supplies lava into the lake via a short spillway. USGS image by M. Patrick.

Late afternoon sunlight illuminates the main island in the lava lake in Halema‘uma‘u crater, at the summit of Kīlauea. The island formed in the previous summit eruption (December 2020-May 2021), and was covered with fresh spatter during the opening stages of the current eruption. USGS photo by M. Patrick.

The eruption continues in Halema‘uma‘u crater, at Kīlauea summit. This view from the southern crater rim shows the west vent fountains (center) supplying lava into the western portion of the lava lake. SO₂ gas emission rates remain elevated, and were measured at 4,700 tonnes per day on October 7. USGS photo taken by L.

This photo from Thursday, October 7, shows the lava lake near the western vent in Halema‘uma‘u crater, at the summit of Kīlauea. The zig zag pattern separating the crustal plates is evident here, as are several spreading zones which cut across the pattern. USGS photo by M. Patrick.

A view of the west vent in Halema‘uma‘u crater, at the summit of Kīlauea. This photo was taken from the northwest caldera rim, providing a good view inside the cone, as well as a view of the small spillway supplying lava into the lake. USGS photo by M. Patrick.