June 10, 1088 Tsunami: Miyako, Iwate Prefecture, Japan
A tsunami caused by a magnitude 7 earthquake began at Miyako, Iwate Prefecture, Japan on June 10, 1088. 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
The tsunami
- Date
- June 10, 1088
- Source
- Miyako, Iwate Prefecture, Japan
- Cause
- Earthquake
- Earthquake
- Magnitude 7
- Runups recorded
- 1
- Tsunami intensity (Soloviev-Imamura)
- 1.5
- Tsunami magnitude (Iida)
- 1
- Waters
- Ocean
- How certain
- Definite tsunami
- Source location
- 40.500° N, 143.000° E
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.
1088, June 10. 40.5 N, 143 E, magnitude 7. Earthquake felt 9 times, 3 big tsunamis from 20h to next morning at Miyako. (reference #150)
1088, May 13 [probably same event as June 10, 1088].
There were nine shocks in the vicinity of Miyako (Iwate Prefecture) from 20:00 until the following morning. Large waves ran up on the coast three times before 1:00. The wave periods were greater than 1 hour. (reference #414)
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 |
|---|---|---|---|---|---|---|---|
| Sanriku Coast | Japan | 156 | 2 | Eyewitness observation of water height |
More
Every tsunami in 1088The 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 93.