June 16, 1026 Tsunami: Off Masuda, Shimane Prefecture, Japan
A tsunami caused by a magnitude 7.5 earthquake began at Off Masuda, Shimane Prefecture, Japan on June 16, 1026. The water rose as high as 10 meters. Its effects were recorded at 2 places. It killed 1,001 people, counting the earthquake or eruption that caused it.
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
- June 16, 1026
- Source
- Off Masuda, Shimane Prefecture, Japan
- Cause
- Earthquake
- Earthquake
- Magnitude 7.5
- Maximum water height
- 10 m (32.8 ft)
- Runups recorded
- 2
- Tsunami intensity (Soloviev-Imamura)
- 3
- Tsunami magnitude (Iida)
- 3.3
- Waters
- Ocean
- How certain
- Probable tsunami
- Source location
- 34.800° N, 131.800° E
The toll
- Deaths
- 1,001
- Damage
- Extreme (about $25 million or more); Severe (about $5 to $25 million) with the earthquake or eruption that caused it
- Houses destroyed
- 3,000
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.
1026, June 16, 23 local time, 34.8 N, 131.8 E, magnitude 7.5. About 3000 houses swept away, more than 1000 deaths. Kamo Island off Masuda sunk. Tsunami attacked the Iwami coast from Kuromatsu to Susa, 6-10 m height around the rivers of Takatsu and Masuda. (reference #150)
1026, May 16, 23-24. (reference #3785)
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 |
|---|---|---|---|---|---|---|---|
| Susa | Japan | 27 | 10 | Eyewitness observation of water height | |||
| Iwami Coast | Japan | 58 | 10 | Eyewitness observation of water height | 1,000 |
More
Every tsunami in 1026The 1000sTsunamis 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 83.