October 22, 1826 Tsunami: Unimak Island, AK, United States
A tsunami caused by a volcano began at Unimak Island, AK, United States on October 22, 1826. Its effects were recorded at 1 place.
Where the waves reached
The source (white) and every runup with a place, colored by the water height recorded there. A ring is a runup NCEI marks doubtful.
- Under 1 m
- 1 to 3 m
- 3 to 10 m
- 10 to 30 m
- 30 m and more
- Height not recorded
The tsunami
- Date
- October 22, 1826
- Source
- Unimak Island, AK, United States
- Cause
- Volcano
- Runups recorded
- 1
- Waters
- Ocean
- How certain
- Erroneous entry
- Source location
- 55.000° N, 165.000° W
The toll
The record gives no deaths, injuries or damage for this tsunami.
What the record says
NCEI’s account, from the sources it cites.
The eruption of Shishaldin Volcano produced a substantial amount of ash, reportedly covering nearby islands shin-deep. It was dark for eight days on Unimak Island following the eruption, and a large number of wild hogs perished from cold and ash on Chernabura Island. There is no reported wave activity in accounts of this event; it is included as it may relate to accounts of events of 8/21/1825 and 8/8/27.
Every runup
Nearest the source first. Heights are above sea level at the time; a tide gauge reads half the wave’s full height.
| Where | Country | Km from source | Water height, m | Inland, m | Measured by | First wave, UTC | Deaths |
|---|---|---|---|---|---|---|---|
| Unimak Island, AK, AK doubtful | United States | 0 | Eyewitness observation of water height |
More
Every tsunami in 1826The 1800sTsunamis of United StatesThis day in weather historyAlerts in force
Sources
Tsunami events and runups from NOAA’s National Centers for Environmental Information, Global Historical Hazard Database, cited as NCEI/WDS, doi:10.7289/V5PN93H7. Public domain. Read 2026-09-24. NCEI tsunami event 657.