Six New Fissure Vents Open at Kīlauea Summit
The new vents emerged following a period of reservoir repressurization, signaling ongoing summit volatility.
Updated on Oct. 15, 2026 in Geology
Live Poll
In your area, do you trust official volcano monitoring and alerts to keep you safe?
Between September 14 and 16, 2026, six new eruptive fissure vents opened along the western wall of the Halemaʻumaʻu crater at the Kīlauea summit. These vents, situated 150 feet below the northern vent base, represent the latest stage in the episodic summit activity that has persisted since late 2024.
Why it matters
The formation of these vents reveals how Kīlauea's shallow magma storage system responds to intense repressurization. By bypassing solid rock to follow preexisting pathways, the system demonstrates the ongoing, volatile nature of the summit's plumbing.
The new fissures extend 0.1 to 0.6 miles north of the main vent complex, with ground tilt at the Uēkahuna station measuring 13 microradians. The lava composition matches the shallow chamber, indicating a direct connection to the primary summit storage.
The players
Kīlauea
A highly active shield volcano located on the Big Island of Hawaii that has been erupting episodically within its summit caldera since 2024.
The details
The vents formed when highly pressurized magma exploited preexisting cracks to reach the surface, rather than fracturing new, solid rock. This process follows a period of reservoir repressurization that began in early September. Subsequent activity included a separate intrusion northeast of the vents on September 30, which triggered over 100 localized earthquakes.
Timeline
December 23, 2024: Kīlauea began current episodic eruptions at the summit caldera.
September 7, 2026: Pressure in the summit reservoir was fully rebuilt.
September 14-16, 2026: Six new eruptive fissure vents opened at the Kīlauea summit.
September 30-October 1, 2026: An intrusion event occurred northeast of the eruptive vents.
The Tech Race
This activity follows the established pattern of episodic summit eruptions observed since late 2024. It marks a continuation of the current eruptive cycle rather than a shift to a new volcanic regime.
Residents in Hawaii should remain aware of potential changes in volcanic activity, including surface fountaining or subsurface shifts. Current conditions continue to support the possibility of further eruptive episodes.
The takeaway
The recent fissure formation underscores the volatile nature of Kīlauea's current summit plumbing. Observers should track the continued evolution of sulfur dioxide emissions and localized seismicity to gauge the stability of the shallow reservoir.
Further reading
For more background on the island's seismic patterns, see our Geology section.
Source note: This article includes information reported by USGS.
Live Poll
In your area, do you trust official volcano monitoring and alerts to keep you safe?
