October 31, 1341 Tsunami: Jusanko, Tsugaru Aomori Prefecture, Japan
A tsunami caused by a magnitude 7 earthquake began at Jusanko, Tsugaru Aomori Prefecture, Japan on October 31, 1341. Its effects were recorded at 1 place. It killed 2,600 people.
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 31, 1341
- Source
- Jusanko, Tsugaru Aomori Prefecture, Japan
- Cause
- Earthquake
- Earthquake
- Magnitude 7
- Runups recorded
- 1
- Tsunami intensity (Soloviev-Imamura)
- 2.5
- Tsunami magnitude (Iida)
- 2.5
- Waters
- Ocean
- How certain
- Probable tsunami
- Source location
- 41.000° N, 139.500° E
The toll
- Deaths
- 2,600
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.
Oct 31, 1341, 41 N, 139.5 E, magnitude 7. 2600 people drowned at Jusan-minato along the coast of which 860 persons killed and 600 persons killed at the area around the Ewaki river. (reference #150)
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 |
|---|---|---|---|---|---|---|---|
| Jusan-Minato | Japan | 70 | Eyewitness observation of water height | 2,600 |
More
Every tsunami in 1341The 1300sTsunamis of JapanThe earthquakeThis 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 116.