On Hawaii’s Big Island, one of the world’s most closely watched volcanoes has spent much of the past year putting on a recurring show of raw geologic power. Kilauea has been erupting in dramatic bursts, with lava fountains that periodically rocket hundreds of feet into the sky before pausing for days or weeks and then returning. The activity, confined to the volcano’s summit crater, has drawn scientists and spectators alike while offering an unusually clear window into how an active volcano behaves.
Kilauea holds a special place in the study of volcanoes, both because it is so active and because it is so accessible to scientists and visitors. Situated on the southeastern side of the island of Hawaii, it has erupted frequently in modern times, giving researchers repeated opportunities to refine how they forecast and interpret volcanic behavior. The current run of summit fountaining has extended that record with an unusually rhythmic sequence of eruptions.
An episodic eruption at Kilauea’s summit
The current eruption began on December 23, 2024, and has unfolded in a distinctive stop-and-start pattern rather than a continuous flow. According to the U.S. Geological Survey’s eruption information, the activity is concentrated within Halemaumau, the crater at Kilauea’s summit, where lava has erupted from vents on the crater floor. Each burst of fountaining generally lasts less than 12 hours, followed by a pause that can stretch beyond three weeks before the next episode begins.
Scientists have numbered these events in sequence, and by mid-2026 the eruption had produced dozens of separate fountaining episodes, each documented by the Hawaiian Volcano Observatory as it occurred.
The episodic style contrasts with the long-lived lava lake and continuous flows that characterized earlier chapters of Kilauea’s activity. Instead of a steady outpouring, the volcano has settled into a pattern of dramatic but short-lived bursts, sometimes hours long, followed by quiet stretches in which the crater floor cools and the next batch of magma works its way toward the surface. That cadence has made each episode a discrete, observable event rather than a background condition.
Lava fountains hundreds of feet high
The most spectacular feature of the eruption has been the height of its fountains. During one episode in May 2026, the USGS reported that lava jets from the north vent reached roughly 650 feet above the ground. Video the agency captured of a June 1 episode documented sustained fountaining that lasted about nine hours before ending abruptly. A late-July episode sent fountains to a maximum of about 500 feet, again from the north vent.
Fountains of that scale form when gas-rich magma rises quickly and the dissolved gases expand and escape, propelling molten rock upward like the spray from a shaken bottle. The abrupt starts and stops reflect the way pressure builds beneath the summit and then releases, a rhythm the observatory has tracked closely across successive episodes.
The pattern resembles a cycle of filling and draining. Between episodes, magma accumulates in a reservoir beneath the summit, gradually inflating the ground as pressure grows. When that pressure reaches a threshold, an episode begins and the built-up magma erupts, often draining back down and causing the surface to deflate once the fountaining stops. Measuring that rise and fall lets scientists estimate, within a rough window, when the next burst is likely to arrive.
How scientists monitor the volcano
Kilauea is among the most instrumented volcanoes on Earth, which allows scientists to anticipate episodes and warn the public. The Hawaiian Volcano Observatory watches for the ground deformation that signals magma accumulating underground, along with changes in seismic activity and gas emissions. Those measurements feed the regular volcano updates the agency issues, which flag when conditions suggest another fountaining episode may be near.
The observatory also maintains a running photo and video chronology that captures each episode as it happens, building a detailed visual and scientific record of an eruption that has become a natural laboratory for studying how magma moves and erupts.
The hazards that come with the spectacle
For all its visual drama, the summit eruption carries real hazards, even though the lava has remained within the crater and away from communities. Volcanic gas, particularly sulfur dioxide, is released during eruptive episodes and can react in the atmosphere to form a haze known as vog, which can affect air quality downwind. High fountains also loft fine volcanic glass fibers, sometimes called Pele’s hair, and lightweight rock fragments that winds can carry beyond the immediate vent area.
That relative safety is not guaranteed to last, which is part of why monitoring matters. Kilauea’s behavior can shift, and past eruptions have moved from the summit into residential areas with destructive consequences, most notably in 2018, when lava flows on the volcano’s lower flank destroyed hundreds of homes. The current summit-confined activity is far less threatening, but the observatory watches for any sign that magma is migrating toward populated zones.
Because the activity is concentrated at the summit within Hawaii Volcanoes National Park, its main risks have centered on air quality and on hazards near the crater rim rather than on threats to homes. That combination, of powerful eruptions with limited danger to populated areas, has made Kilauea’s ongoing episodes a rare chance to observe an active volcano at close range while scientists document each fountain for what it reveals about the forces at work beneath the island.
This article was produced with the assistance of AI and reviewed by Morning Overview editors prior to publication.
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