Historical tsunamis · Apr 20, 2026, 7:53 AM UTC
2026 Off Northeast Coast Honshu tsunami
Japan
The tsunami of Apr 20, 2026, 7:53 AM UTC originated near Off Northeast Coast Honshu (Japan).
Key facts
- Date
- Apr 20, 2026, 7:53 AM UTC
- Cause
- Earthquake
- Magnitude
- M7.4
- Depth
- 35 km
- Maximum documented water height
- 0.80 m
- Injuries
- 10
- Observation records
- 24
- Countries affected
- 3
It was triggered by a magnitude 7.4 earthquake at a depth of 35 km.
The highest documented water height was 0.80 m (Kujiko, Japan).
24 observation sites in 3 countries are recorded.
Outside the source country, the earliest documented arrival was at D21419 Bpr, 209 Nm S of Kuril Is (Russia) after 1:20 h.
Map of observation sites
24Each 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) · Apr 20, 2026, 7:53 AM UTC
- 0:17 hJapan · Miyako · 0.40 m
- 1:20 hRussia · D21419 Bpr, 209 Nm S of Kuril Is · 0.01 m
14 places with a documented arrival time
Observations by country
| Country | Observation records | Maximum documented water height | Deaths | Earliest arrival |
|---|---|---|---|---|
| Japan | 19 | 0.80 m Kujiko | — | 0:17 h |
 United States | 4 | 0.06 m Haleiwa, Oahu, Hi | — | — |
 Russia | 1 | 0.01 m D21419 Bpr, 209 Nm S of Kuril Is | — | 1:20 h |
Highest documented water heights
15 / 24Individual 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 | 0.80 m | 108 km | Japan |
| Hachinohe · Aomori | 0.40 m | 144 km | Japan |
| Miyako · Iwate | 0.40 m | 97 km | Japan |
| Urakawa · Hokkaido | 0.40 m | 247 km | Japan |
| Ayukawa · Miyagi | 0.30 m | 227 km | Japan |
| Sendaishinko · Miyagi | 0.30 m | 256 km | Japan |
| Shiraoi · Hokkaido | 0.30 m | 322 km | Japan |
| Shoyagyoko · Hokkaido | 0.30 m | 221 km | Japan |
| Soma · Fukushima | 0.30 m | 296 km | Japan |
| Tokachiko · Hokkaido | 0.30 m | 262 km | Japan |
| Tomakomaihigashiko · Hokkaido | 0.30 m | 312 km | Japan |
| Kamaishi · Iwate | 0.20 m | 126 km | Japan |
| Kiritappu · Hokkaido | 0.20 m | 389 km | Japan |
| Mutsuogawara · Aomori | 0.20 m | 177 km | Japan |
| Mutsushi Sekinehama · Aomori | 0.20 m | 219 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.