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September 12, 2025—Kīlauea summit eruption reference map

September 12, 2025
Media
Color map showing area covered by lava flows in recent volcanic eruption
Sources/Usage: Public Domain. View Media Details
This reference map depicts the Kīlauea summit eruption within Halema‘uma‘u crater that began on December 23, 2024. As of this posting on September 12, 2025, the eruption has had thirty-two episodes, with the most recent occurring on September 2. Most of the map data included here were collected during a USGS Hawaiian Volcano Observatory helicopter overflight on September 11, so the provided statistics are reflective of the entire eruption to this point.Note that the map statistics now indicate a volume-averaged thickness for lava flows on the crater floor, rather than the maximum thickness value included in previous eruption reference maps. Since the lava flows are sloped downward from west to east, the maximum thickness was only representative of areas immediately adjacent to the eruptive vents and was difficult to measure consistently. The average thickness value is a better approximation over broader swaths of the crater floor, as well as a more consistent metric.
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