October 20, 1903 Tsunami: Blacklead Island, Cumberland Sound, Canada
A tsunami of unknown cause began at Blacklead Island, Cumberland Sound, Canada on October 20, 1903. 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
Travel times
How long the first wave took to reach each part of the ocean, one line for each hour up to 24, estimated from the source and the depth of the sea.
The travel times are computed in your browser, which needs JavaScript.
- 1 to 4 hours
- 5 to 6 hours
- 7 to 14 hours
- 15 hours and more
Computed in your browser the way NOAA’s own travel time maps are: the wave travels at the square root of gravity times the depth, over NOAA’s ETOPO1 depths averaged to a 10 arc-minute grid. Checked against NOAA NCEI’s maps for 21 tsunamis over the first 24 hours, these lines fall within 10 minutes of NCEI’s at half the points compared and within 52 minutes at 9 in 10. They give when the first wave could arrive, not how high it is; bays, harbors and island chains finer than the grid can see it later. Not for use in a warning: see tsunami.gov.
The tsunami
- Date
- October 20, 1903
- Source
- Blacklead Island, Cumberland Sound, Canada
- Cause
- Unknown
- Runups recorded
- 1
- Waters
- Ocean
- How certain
- Probable tsunami
- Source location
- 64.980° N, 66.200° W
The toll
- Houses damaged
- Few (about 1 to 50)
Where the literature gives no number, NCEI records a description on a scale of 1 to 4, printed here in its words. Damage is in millions of US dollars of the year of the event, not adjusted for inflation.
What the record says
NCEI’s account, from the sources it cites.
About 5 A.M. a wonderful tidal wave swept down upon the island. It actually came within sixty yards of our house [16] driving on the beach large pieces of an iceberg which had been in some measure shattered by the gale of the 17th. Some of the boats which had been hauled up well on the land were lifted right up and carried some sixty yards further on, while some of the poor Eskimo were actually driven out of their wretched dwellings by the sea and ice. Truly we pass through some strange experiences in this icy land [Blacklead Island]. (reference #11843)
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 |
|---|---|---|---|---|---|---|---|
| Blacklead Island | Canada | 0 | Eyewitness observation of water height |
More
Every tsunami in 1903The 1900sTsunamis of CanadaThis 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 5653.