Halemaʻumaʻu eruption · episode 35 of 55
Kīlauea episode 35
Episode 35 of Kīlauea's Halemaʻumaʻu eruption began at 8:05 p.m. HST on October 17, 2025 and ended at 3:32 a.m. HST on October 18, 2025. USGS gives the duration as 7 hours. HVO's Uēkahuna tiltmeter (UWD) recorded over 28 microradians of deflation during the episode. HVO notes: North and south vents active; north vent inclined.
Episode 35 at a glance
- Start (HST)
- October 17, 2025, 8:05 p.m.USGS timeline
- End (HST)
- October 18, 2025, 3:32 a.m.USGS timeline
- Duration
- 7 hoursUSGS timeline
- UWD tilt (deflation)
- over 28 microradiansHVO notice
- Max fountain height
- about 479 mUSGS timeline
- Lava erupted
- about 10.2 million m³USGS timeline
- Pause that followed
- 22 daysUSGS timeline
In HVO's words
The sentences these figures come from, quoted from USGS Hawaiian Volcano Observatory notices.
“UWD recorded over 28 microradians of deflationary tilit during episode 35.”
HVO notices about episode 35
- Status Report · Oct 16, 2025, 1:14 p.m. HST
- Volcano Activity Notice · Oct 17, 2025, 8:35 p.m. HST
- Status Report · Oct 17, 2025, 10:05 p.m. HST
- Volcano Activity Notice · Oct 18, 2025, 4:30 a.m. HST
- Daily Update · Oct 18, 2025, 10:25 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.