Halemaʻumaʻu eruption · episode 9 of 55
Kīlauea episode 9
Episode 9 of Kīlauea's Halemaʻumaʻu eruption began at 10:16 a.m. HST on February 11, 2025 and ended at 8:43 a.m. HST on February 12, 2025. USGS gives the duration as 22 hours. HVO's Uēkahuna tiltmeter (UWD) recorded nearly 13 microradians of deflation during the episode. HVO notes: North and south vents active.
Episode 9 at a glance
- Start (HST)
- February 11, 2025, 10:16 a.m.USGS timeline
- End (HST)
- February 12, 2025, 8:43 a.m.USGS timeline
- Duration
- 22 hoursUSGS timeline
- UWD tilt (deflation)
- nearly 13 microradiansHVO notice
- Max fountain height
- about 135 mUSGS timeline
- Lava erupted
- about 5.2 million m³USGS timeline
- Pause that followed
- 7 daysUSGS timeline
In HVO's words
The sentences these figures come from, quoted from USGS Hawaiian Volcano Observatory notices.
“UWD recorded nearly 13 microradians of deflationary tilt during the episode 9 eruption but switched to inflation as the vents shut down around 8:30 a.m. HST.”
HVO notices about episode 9
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.