Halemaʻumaʻu eruption · episode 54 of 55
Kīlauea episode 54
Episode 54 of Kīlauea's Halemaʻumaʻu eruption began at 10:30 a.m. HST on August 25, 2026 and ended at 7:33 p.m. HST the same day. USGS gives the duration as 9 hours. HVO's Uēkahuna tiltmeter (UWD) recorded approximately 12.7 microradians of deflation during the episode. HVO notes: Precursory lava flows from north, south; north vent erupted lava fountain.
Episode 54 at a glance
- Start (HST)
- August 25, 2026, 10:30 a.m.USGS timeline
- End (HST)
- August 25, 2026, 7:33 p.m.USGS timeline
- Duration
- 9 hoursUSGS timeline
- UWD tilt (deflation)
- approximately 12.7 microradiansHVO notice
- Max fountain height
- about 150 mUSGS timeline
- Lava erupted
- about 4.0 million m³USGS timeline
- Pause that followed
- Not stated by HVO
In HVO's words
The sentences these figures come from, quoted from USGS Hawaiian Volcano Observatory notices.
“The Uēkahuna tiltmeter (UWD) recorded approximately 12.7 microradians of deflationary tilt during episode 54.”
HVO notices about episode 54
- Volcano Activity Notice · Aug 25, 2026, 6:38 a.m. HSTPrecursory low-level eruptive activity before episode 54 of the ongoing Halemaʻumaʻu eruption began around 6:16 a.m. HST on August 25.
- Volcano Activity Notice · Aug 25, 2026, 10:43 a.m. HSTEpisode 54 of the ongoing Halemaʻumaʻu eruption began at 10:30 HST on August 25, 2026.
- Volcano Activity Notice · Aug 25, 2026, 12:23 p.m. HSTEpisode 54 of the ongoing Halemaʻumaʻu eruption continues as of 12:15 p.m. HST on August 25.
- Volcano Activity Notice · Aug 25, 2026, 7:47 p.m. HSTLava fountaining episode 54 of the ongoing Halemaʻumaʻu eruption ended abruptly at 7:33 p.m. HST on August 25. USGS is dropping the Volcano Alert Level from WATCH to ADVISORY and the Aviation Color Code from ORANGE to YELLOW.
- Status Report · Aug 25, 2026, 8:22 p.m. HSTSummary: Episode 54 of the ongoing Halemaʻumaʻu eruption began around 10:30 a.m. HST and ended at 7:33 p.m. HST on August 25, 2026, after 9 hours of continuous lava fountaining.
Daily updates: USGS Kīlauea volcano updates. Full table: USGS Timeline of Eruptive Episodes.
Times are Hawaiʻi-Aleutian Standard Time (HST). Start and pause times, durations, fountain heights and lava volumes come from the USGS Hawaiian Volcano Observatory's Timeline of Eruptive Episodes; tilt figures and episodes not yet in that table are quoted from HVO notices. USGS describes these as unreviewed, preliminary estimates that are subject to revision. Durations for episodes 17 and earlier may include precursory activity, and HVO rounds durations to the nearest hour, half-hour or day. A blank cell means HVO hasn't published that figure in a form we could read; we don't estimate it.
Credit: U.S. Geological Survey. This archive is generated automatically and is not an official USGS product.