Historical tsunamis · Nov 9, 2025, 8:03 AM UTC
2025 Sanriku tsunami
Japan
The tsunami of Nov 9, 2025, 8:03 AM UTC originated near Sanriku (Japan).
Key facts
- Date
- Nov 9, 2025, 8:03 AM UTC
- Cause
- Earthquake
- Magnitude
- M6.8
- Depth
- 10 km
- Maximum documented water height
- 0.20 m
- Observation records
- 4
- Countries affected
- 1
It was triggered by a magnitude 6.8 earthquake at a depth of 10 km.
The highest documented water height was 0.20 m (Kujiko, Japan).
4 observation sites in 1 countries are recorded.
Map of observation sites
4Each dot is a documented observation site; colour and size show the observed water height. The triangle marks the source.
Tsunami arrival times
Documented arrival times from the NOAA/NCEI database, showing the earliest recorded location per country. Coverage is incomplete: a country without an entry was not necessarily spared.
- 0:00 hEarthquake (origin) · Nov 9, 2025, 8:03 AM UTC
- 0:34 hJapan · Ofunato · 0.20 m
1 places with a documented arrival time
Observations by country
| Country | Observation records | Maximum documented water height | Deaths | Earliest arrival |
|---|---|---|---|---|
| Japan | 4 | 0.20 m Kujiko | — | 0:34 h |
Highest documented water heights
4 / 4Individual documented observations for this event. Heights come from different measurement types and sources; not every location has a measured height.
| Location / station | Observed height | Distance from source | Country |
|---|---|---|---|
| Kujiko · Iwate | 0.20 m | 163 km | Japan |
| Ofunato · Iwate | 0.20 m | 150 km | Japan |
| Kamaishi · Iwate | 0.10 m | 132 km | Japan |
| Miyako · Iwate | 0.10 m | 126 km | Japan |
More tsunamis
Source: NOAA National Centers for Environmental Information (NCEI), Global Historical Tsunami Database. Confirmed events only. Deaths and damage are database estimates; older records are incomplete. Water heights come from different types of observation.