September 5, 1767 Tsunami: Ireland
A tsunami of unknown cause began at Ireland on September 5, 1767. The water rose as high as 1.5 meters. Its effects were recorded at 2 places in at least 2 countries.
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
- September 5, 1767
- Source
- Ireland
- Cause
- Unknown
- Maximum water height
- 1.5 m (4.9 ft)
- Runups recorded
- 2
- Tsunami magnitude (Iida)
- 0.6
- Waters
- Ocean
- How certain
- Very doubtful tsunami
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.
Reference #1879: "On the 5th September at between 7 and 8 p.m., the sea at Ostend, and the Liffey [River] at Dublin, ebbed and flowed suddenly and violently to the extent of 4 or 5 feet. No shock is mentioned."
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 |
|---|---|---|---|---|---|---|---|
| Ostend (Ostende, Oostende) | Belgium | 1.5 | Eyewitness observation of water height | ||||
| Liffey River, Dublin | Ireland | 1.5 | Eyewitness observation of water height |
More
Every tsunami in 1767The 1700sTsunamis of IrelandThis 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 493.