Images

This black solidified lava channel is a stark contrast to the weathered brown walls of Halemaʻumaʻu crater nearby. The lava channel transported lava from the north vent, along the north rim of the crater, allowing lava flows to reach the farthest regions of the crater to the east during the 9 hours of lava fountaining of episode 37 on November 25, 2025.

An aerial view of the volcanic vents in the southwest part of Halemaʻumaʻu crater, at the summit of Kīlaeua volcano. USGS photo by H. Winslow on December 2, 2025.  

The USGS Hawaiian Volcano Observatory often gets asked how long it will take the lava flows to fill in Halemaʻumaʻu crater and spill onto the upper caldera floor of Kīlauea. This photo, taken from the floor of the crater, shows the lava flows from episode 37 (November 25) where they contact the north wall of the crater, which rises several hundred feet above.

An aerial view of the north (right) and south (left) vents in Halema'uma'u, taken during a USGS Hawaiian Volcano Observatory monitoring overflight the morning of December 2, 2025. Both vents were actively degassing, and a spattering lava surface was visible deep within their conduits.  USGS photo by D. Downs

The steaming north wall of Halemaʻumaʻu crater wall rises several hundred feet above the lava flows that cover the floor of the crater.

This aerial photograph shows Kīlauea, Mauna Loa and Mauna Kea. In the foreground is the forested area just north of Kīlauea caldera; the slope of Mauna Loa's Northeast Rift Zone rises to the left side of the image, while Mauna Kea is visible in the background. USGS photo by K. Mulliken. 

During a USGS Hawaiian Volcano Observatory monitoring overflight the morning of December 2, 2025, geologists were able to see a spattering lava surface deep within the north vent. The yellow material around the vents is native sulfur.

Upper left: a dusty lava puahiohio (at right in frame) above the main 2022 Mauna Loa lava flow on 2 December 2022, with the eruptive plume further in the background (at left in frame). Upper right: a lava puahiohio rips up the crust of the Kīlauea summit lava lake on 7 June 2023.

Calendar of the USGS-Hawaiian Volcano Observatory (HVO) Volcano Awareness Month events in January 2026, during which HVO and close partners raise awareness of Hawaii’s volcanoes and active volcanic processes that continue to influence us today. 

The left map shows the tephra fall associated with Kīlauea's episodic summit eruption, from December 2024-December 2025. Tephra is a generic word for any material erupted by a volcano that travels through the air before landing on the ground.

Flyer announcing the USGS-Hawaiian Volcano Observatory (HVO) Volcano Awareness Month events in January 2026, during which HVO and close partners raise awareness of Hawaii’s volcanoes and active volcanic processes that continue to influence us today. 

Episode 37 lava fountaining occurred On November 25, from 2:30 p.m. to 11:39 p.m., totaling just over 9 hours. Fountains were limited to the north vent, which sent lava flows over a large portion of the crater floor. Fountain heights reached 500-600 ft (150-180 meters). The south vent showed only weak spattering and flaming. USGS photo by M. Patrick. 

Following several days of precursory overflows and low dome fountaining, episode 37 of the Kīlauea summit eruption began yesterday at 2:30 p.m. with lava fountaining from the north vent.  A wide fountain developed, eventually reaching heights of 500-600 ft (150-180 meters), sending flows across a broad portion of the crater floor.

The telephoto shows lava flowing east across the floor of Halemaʻumaʻu crater, fed by the lava fountains in the west part of the crater.  Preliminary estimates suggest that approximately 6 million cubic meters (7.8 million cubic yards) of lava were erupted during episode 37, based on ground deformation data. USGS photo by M. Patrick. 

This reference map depicts the Kīlauea summit eruption within Halema‘uma‘u crater that began on December 23, 2024. The data for this map were collected during a Hawaiian Volcano Observatory helicopter overflight on November 24, 2025; as such, the provided statistics are reflective of the first thirty-six episodes of the eruption through November 9.

USGS Hawaiian Volcano Observatory scientists document lava fountains and lava flows during episode 37 of the ongoing Kīlauea summit eruption in Halemaʻumaʻu crater. From the rim of the crater, scientists can use a laser rangefinding device to approximately measure the lava fountain heights, and distance the lava flows have travelled. USGS photo by M.

Telephoto view of lava flows on the floor of Halemaʻumaʻu crater. These lava flows were erupted during episode 37 of lava fountaining at the summit of Kīlauea, which was active for about 9 hours on November 25. USGS photo by M. Patrick. 

During a helicopter overflight on November 24, USGS Hawaiian Volcano Observatory scientists had the opportunity to document the active vents from the floor of Halema‘uma‘u crater, within Kaluapele (Kīlauea summit caldera).

USGS Hawaiian Volcano Observatory scientists landed briefly on Halema‘uma‘u crater floor on November 24, 2025, during a Kīlauea summit monitoring overflight.

This aerial view looking to the southeast shows the volcanic gas plume being emitted from the vents of the ongoing Halema‘uma‘u eruption at Kīlauea summit.

An aerial view looking down into the south vent (center) of the ongoing Kīlauea summit eruption within Halema‘uma‘u crater. A tiny spot of orange incandescent lava was visible deep in the south vent on the morning of November 24 during a USGS Hawaiian Volcano Observatory monitoring helicopter overflight.