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Around 9:15 a.m. HST this morning, January 15, 2025, the eruption of Kīlauea within Kaluapele (summit caldera) resumed with a small lava flow exiting the north vent. Later in the morning, more vigorous lava fountaining began, which deposited tephra material on the west rim of the caldera in the closed area of Hawaiʻi Volcanoes National Park.

Episode 4 of the ongoing Kīlauea summit eruption began this morning, January 15, 2025. Lava fountains resumed erupting from the two vents that have been active in the eruption that began within Halemaʻumaʻu at the summit of Kīlauea volcano on December 23, 2024.

USGS Hawaiian Volcano Observatory scientists collected samples of episode 4 of the ongoing Kīlauea summit eruption, which began the morning of January 15, 2025. The samples were collected from the west rim of Kaluapele, Kīlauea summit caldera.

An aerial view of both eruptive vents from the December 2024 to January 2025 eruption in Kīlauea's summit. This photo is looking down with the south vent on the left and the north vent on the right. The south vent has been the most active during the eruption and produced fountains up to 90 meters (about 300 feet) during its opening phase.

This aerial photo, looking southeast from Kīlauea summit down Chain of Craters Road within Hawai‘i Volcanoes National Park, shows a lava flow from 1974 (bottom left and right) along with Puhimau Crater (center left).

This aerial view shows the two eruptive cones from the December 2024 to January 2025 paused eruption at Kīlauea's summit. The eruption paused on Jan 3, 2025, but geologists observed active lava within the vents during the monitoring overflight. This photo is looking southwest with the southwest flank of Mauna Loa in the background. USGS photo by H. Winslow.

Ground tilt and eruptive episodes associated with Kīlauea summit eruption December 23, 2024, to January 10, 2025. Eruptive episodes are highlighted in red. Fountain Episode 1 (E1) began at 2:20 a.m. HST on December 23, 2024, and continued until 4 p.m. that day (14 hours duration).​ Fountain Episode 2 (E2) began at 8 a.m.

Telephoto view of eruptive cones from the December 2024 to January 2025 eruption in Kīlauea's summit. This photo was taken looking down onto the caldera floor during a USGS Hawaiian Volcano Observatory monitoring overflight the morning of January 10, 2025.

An aerial image of the western portion of Halema‘uma‘u crater within Kaluapele (Kīlauea's summit caldera). The eruption remained paused during the morning overflight on January 10, with a plume of volcanic gas rising from the vents on the western crater wall and blowing southwest with typical trade winds.

An aerial view of Kīlauea Iki and Pu‘u Pua‘i taken during an overflight of Kīlauea summit on January 10, 2025. Pu‘u Pua‘i, the large cinder cone in the lower right of the image, was formed by lava fountains that reached 580 meters (1,900 ft) during the 1959 Kīlauea IKI eruption. The popular Kīlauea Iki hiking trail is visible across the crater floor.

On January 10, 2025, USGS Hawaiian Volcano Observatory scientists (HVO) collected data from two semi-permanent GPS sites on Kīlauea's caldera floor. GPS stations record changes in elevation on the caldera floor and can track ground deformation changes that HVO uses for monitoring unrest.

Left: Lava fountains on December 14, 1959, during the Kīlauea Iki eruption. Right: Lava fountains on June 11, 2025, during the Halemaʻumaʻu eruption (episode 25). USGS photos. 

On the morning of January 7, 2025, USGS Hawaiian Volcano Observatory staff made observations and measurements of the 2024-2025 Halema‘uma‘u vents, which ceased eruption in the evening on January 3, 2025. Both the North and South vents continue to emit volcanic gasses, contributing to vog that has been widespread across the Island of Hawai‘i since Saturday.

Looking out across Kaluapele, Kīlauea summit caldera, from the south rim, small islands of solidified crust dot the area of the lava pond that was fed from the lava fountains during the most recent eruption from December 23, 2024, to January 3, 2025. USGS photo by M. Patrick.

A gas plume rises from the inactive vent at Kīlauea summit, two days after the pause in lava effusion.  The vent was quiet, with no audible sound—a contrast with the sounds of lava fountaining, akin to loud crashing waves, on earlier days. USGS photo by M. Patrick. 

Rockfalls continue from the steep caldera walls of Kaluapele, above the new cinder cone within Halemaʻumaʻu at the summit of Kīlauea. Large blocks roll down the flanks of the cone that formed between December 23, 2024, and January 3, 2025, leaving paths in the tephra cone material. USGS photo by M. Patrick. 

An early morning view of summit of Mauna Kea, the flank of Mauna Loa, and the current eruption of Kīlauea captured during a USGS Hawaiian Volcano Observatory helicopter overflight. The north vent shutdown at 2:16 p.m. on January 2 after parts of the cone collapsed into the fountain but is still producing a small gas plume to the right of the active fountain.

A view of the large pyroclastic cone that continued lava fountaining at Kīlauea summit has produced against the western wall of the caldera. Lava pours out of the vents into a large, ponded area in the southwest portion of Halema‘uma‘u crater. USGS photo by M. Patrick. 

Pieces of lava (called tephra because they travel through the air before being deposited on the ground) blanket the crater rim downwind of the erupting vents in Kīlauea summit caldera (Kaluapele). Geologists collect samples of this material to analyze later to learn about the magma storage conditions before the eruption.

USGS Hawaiian Volcano Observatory scientists captured this image of the Kīlauea Overlook within Hawaiʻi Volcanoes National Park during an early morning helicopter overflight on January 3, 2025. Using the cars as a scale, it's easy to see how close the overlook is from the edge of the cliff.

This photo, taken from near the S2cam, shows the active lava fountain within Halema‘uma‘u, Kīlauea, the cone (brown) that has built up around the lava fountain, the southwest portion of the lava lake (silver and black), and the rising plume of volcanic gas.