Six New Eruptive Vents Open at Kīlauea Summit

New fissures emerged along the western wall of Halemaʻumaʻu in mid-September after reservoir repressurization.

Updated on Oct. 15, 2026 in Geology

Rugged volcanic caldera landscape with glowing fissures and rising steam plumes at the Kīlauea summit. — Six new eruptive vents opened at the Kīlauea volcano summit in mid-September 2026, marking a period of continued volcanic activity. AI Illustration. Upload story photo >

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Six new eruptive fissure vents opened at the Kīlauea summit between September 14 and 16, 2026. These vents formed along the western wall of Halemaʻumaʻu following a period of repressurization within the summit magma storage system.

Why it matters

The vents formed because highly pressurized magma was forced along the easiest available pathways. This activity, part of an ongoing series of eruptions since late 2024, reflects the dynamic state of the summit magma storage system.

The new vents extend 0.1 to 0.6 miles north of the main vent complex and sit 150 feet below the base level of the northern vent. Analyses confirm the erupted lava matches magma from the shallow chamber beneath Halemaʻumaʻu.

The players

Kīlauea

This is one of the most active volcanoes in the world located on the Island of Hawaii.

Halemaʻumaʻu

This pit crater is located within the summit caldera of Kīlauea and is a primary site for recent volcanic activity.

The details

Magma reached the surface through preexisting cracks without significant fracturing of the surrounding solid rock. An additional intrusion northeast of the vents from September 30 to October 1 triggered over 100 earthquakes, highlighting continued activity in the region.

December 23, 2024: Kīlauea began episodic eruptions at the summit caldera.
August 2026: Episode 54 of the summit eruption concluded.
September 7, 2026: Pressure in the summit reservoir was rebuilt.
September 14-16, 2026: Six new eruptive fissure vents opened at the Kīlauea summit.
September 30-October 1, 2026: An intrusion occurred northeast of the eruptive vents.

The Big Picture

The emergence of these fissures extends the episodic eruption pattern established by the Kīlauea summit activity since December 23, 2024. This development marks a continuation of the ongoing volcanic unrest rather than a deviation from the established geological behavior.

Residents and visitors should remain aware that changes in volcanic activity remain possible both above and below the surface. Current conditions at the summit continue to be monitored as they remain favorable for additional fountaining episodes.

The takeaway

Volcanic systems like Kīlauea remain highly dynamic even during established eruption cycles. Observers should continue to follow official guidance as subsurface pressure changes can lead to new surface activity with little warning.