Halemaʻumaʻu eruption · episode 27 of 55
Kīlauea episode 27
Episode 27 of Kīlauea's Halemaʻumaʻu eruption began at 9:05 a.m. HST on June 29, 2025 and ended at 7:54 p.m. HST the same day. USGS gives the duration as 11 hours. HVO's Uēkahuna tiltmeter (UWD) recorded approximately 16 microradians of deflation during the episode. HVO notes: North and south vents active, north vent dominant.
Episode 27 at a glance
- Start (HST)
- June 29, 2025, 9:05 a.m.USGS timeline
- End (HST)
- June 29, 2025, 7:54 p.m.USGS timeline
- Duration
- 11 hoursUSGS timeline
- UWD tilt (deflation)
- approximately 16 microradiansHVO notice
- Max fountain height
- about 332 mUSGS timeline
- Lava erupted
- about 5.9 million m³USGS timeline
- Pause that followed
- 8 daysUSGS timeline
In HVO's words
The sentences these figures come from, quoted from USGS Hawaiian Volcano Observatory notices.
“Episode 27 was accompanied by approximately 16 microradians of deflationary tilt at the tiltmeter near Uēkahuna (UWD), which was about 2 microradians less than the amount of deflationary tilt recorded during episode 26.”
Other HVO notices about episode 27 gave: approximately 16.6 microradians.
HVO notices about episode 27
- Volcano Activity Notice · Jun 28, 2025, 8:50 a.m. HST
- Volcano Activity Notice · Jun 29, 2025, 9:31 a.m. HST
- Daily Update · Jun 30, 2025, 9:04 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.