Halemaʻumaʻu eruption · episode 26 of 55
Kīlauea episode 26
Episode 26 of Kīlauea's Halemaʻumaʻu eruption began at 1:40 a.m. HST on June 20, 2025 and ended at 10:25 a.m. HST the same day. USGS gives the duration as 9 hours. HVO's Uēkahuna tiltmeter (UWD) recorded more than 18 microradians of deflation during the episode. HVO notes: North and south vents active, north vent dominant.
Episode 26 at a glance
- Start (HST)
- June 20, 2025, 1:40 a.m.USGS timeline
- End (HST)
- June 20, 2025, 10:25 a.m.USGS timeline
- Duration
- 9 hoursUSGS timeline
- UWD tilt (deflation)
- more than 18 microradiansHVO notice
- Max fountain height
- about 371 mUSGS timeline
- Lava erupted
- about 6.6 million m³USGS timeline
- Pause that followed
- 9 daysUSGS timeline
In HVO's words
The sentences these figures come from, quoted from USGS Hawaiian Volcano Observatory notices.
“Episode 26 was accompanied by more than 18 microradians of deflationary tilt at the tiltmeter near Uēkahuna (UWD), which was 4 microradians more deflation than the amount seen during episode 25.”
Other HVO notices about episode 26 gave: 18.5 microradians.
HVO notices about episode 26
- Volcano Activity Notice · Jun 19, 2025, 11:54 p.m. HST
- Volcano Activity Notice · Jun 20, 2025, 2:10 a.m. HST
- Volcano Activity Notice · Jun 20, 2025, 10:58 a.m. HST
- Daily Update · Jun 21, 2025, 10:06 a.m. HST
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.