Historical tsunamis · Mar 9, 2011, 2:45 AM UTC
2011 Honshu Island tsunami
Japan
The tsunami of Mar 9, 2011, 2:45 AM UTC originated near Honshu Island (Japan).
Key facts
- Date
- Mar 9, 2011, 2:45 AM UTC
- Cause
- Earthquake
- Magnitude
- M7.3
- Depth
- 32 km
- Maximum documented water height
- 0.60 m
- Observation records
- 24
- Countries affected
- 1
It was triggered by a magnitude 7.3 earthquake at a depth of 32 km.
The highest documented water height was 0.60 m.
24 observation sites in 1 countries are recorded.
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) · Mar 9, 2011, 2:45 AM UTC
- 0:15 hJapan · Urakawa · 0.12 m
21 places with a documented arrival time
Observations by country
| Country | Observation records | Maximum documented water height | Deaths | Earliest arrival |
|---|---|---|---|---|
| Japan | 24 | 0.24 m Ayukawa | — | 0:15 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 |
|---|---|---|---|
| Ayukawa · Miyagi | 0.24 m | 118 km | Japan |
| Kujiko · Iwate | 0.23 m | 215 km | Japan |
| Kamaishi · Iwate | 0.18 m | 124 km | Japan |
| Shoyagyoko · Hokkaido | 0.15 m | 401 km | Japan |
| Miyako · Iwate | 0.14 m | 154 km | Japan |
| Sendaishinko · Miyagi | 0.12 m | 159 km | Japan |
| Urakawa · Hokkaido | 0.12 m | 414 km | Japan |
| Mutsushi Sekinehama · Aomori | 0.11 m | 353 km | Japan |
| Soma · Fukushima | 0.11 m | 177 km | Japan |
| Oaraiko · Ibaraki | 0.10 m | 307 km | Japan |
| Mutsuogawara · Aomori | 0.09 m | 304 km | Japan |
| Onahama · Fukushima | 0.09 m | 239 km | Japan |
| Shiraoi · Hokkaido | 0.08 m | 474 km | Japan |
| Tomakomainishiko · Hokkaido | 0.08 m | 478 km | Japan |
| Hachinohe · Aomori | 0.07 m | 259 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.