September 23, 1065 Tsunami: Marmara Sea, Turkey
A tsunami caused by an earthquake began at Marmara Sea, Turkey on September 23, 1065. Its effects were recorded at 3 places.
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 23, 1065
- Source
- Marmara Sea, Turkey
- Cause
- Earthquake
- Runups recorded
- 3
- Waters
- Ocean
- How certain
- Probable 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.
A destructive earthquake in Constantinople was accompanied by sea waves of huge dimensions that devastated Nicolidea, the Princes Islands, Constantinople, Nicaea. No reference to the tsunami is found in any other catalogue (reference #2130).
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 |
|---|---|---|---|---|---|---|---|
| Nicolidea | Turkey | Eyewitness observation of water height | |||||
| Princes Islands, Marmara Sea | Turkey | Eyewitness observation of water height | |||||
| Istanbul (Constantinople) | Turkey | Eyewitness observation of water height |
More
Every tsunami in 1065The 1000sTsunamis of TurkeyThis 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 3103.