Halemaʻumaʻu eruption · episode 45 of 55
Kīlauea episode 45
Episode 45 of Kīlauea's Halemaʻumaʻu eruption began at 1:34 a.m. HST on April 23, 2026 and ended at 10:01 a.m. HST the same day. USGS gives the duration as 8.5 hours. HVO's Uēkahuna tiltmeter (UWD) recorded about 16.0 microradians of deflation during the episode. HVO notes: North vent erupted lava fountain; precursory lava flows from both vents.
Episode 45 at a glance
- Start (HST)
- April 23, 2026, 1:34 a.m.USGS timeline
- End (HST)
- April 23, 2026, 10:01 a.m.USGS timeline
- Duration
- 8.5 hoursUSGS timeline
- UWD tilt (deflation)
- about 16.0 microradiansHVO notice
- Max fountain height
- about 265 mUSGS timeline
- Lava erupted
- about 5.2 million m³USGS timeline
- Pause that followed
- 12 daysUSGS timeline
In HVO's words
The sentences these figures come from, quoted from USGS Hawaiian Volcano Observatory notices.
“The Uēkahuna tiltmeter (UWD) recorded about 16.0 microradians of deflationary tilt during episode 45.”
HVO notices about episode 45
- Volcano Activity Notice · Apr 20, 2026, 9:16 p.m. HST
- Information Statement · Apr 21, 2026, 3:33 p.m. HST
- Volcano Activity Notice · Apr 23, 2026, 2:12 a.m. HST
- Volcano Activity Notice · Apr 23, 2026, 6:35 a.m. HST
- Volcano Activity Notice · Apr 23, 2026, 10:13 a.m. HST
- Status Report · Apr 23, 2026, 11:24 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.