Halemaʻumaʻu eruption · episode 18 of 55
Kīlauea episode 18
Episode 18 of Kīlauea's Halemaʻumaʻu eruption began at 3:30 a.m. HST on April 22, 2025 and ended at 1:28 p.m. HST the same day. USGS gives the duration as 10 hours. HVO notes: Precursory low-level activity began on April 16, 2025 - 10:01 p.m.; north and south vents active, south vent dominant.
Episode 18 at a glance
- Start (HST)
- April 22, 2025, 3:30 a.m.USGS timeline
- End (HST)
- April 22, 2025, 1:28 p.m.USGS timeline
- Duration
- 10 hoursUSGS timeline
- UWD tilt (deflation)
- Not stated by HVO
- Max fountain height
- about 266 mUSGS timeline
- Lava erupted
- about 5.2 million m³USGS timeline
- Pause that followed
- 9 daysUSGS timeline
Start: the USGS timeline gives “April 22, 2025 - 3:30 a.m.”, but an HVO notice at the time said: “The fountaining phase of episode 18 began at 3:20 a.m on April 22 and lasted for just over 10 hours.”
HVO notices about episode 18
- Status Report · Apr 16, 2025, 10:26 p.m. HST
- Status Report · Apr 22, 2025, 4:36 a.m. HST
- Status Report · Apr 22, 2025, 2:20 p.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.