Historical tsunamis · Nov 2, 1936, 8:46 PM UTC
1936 Sanriku tsunami
Japan
The tsunami of Nov 2, 1936, 8:46 PM UTC originated near Sanriku (Japan).
Key facts
- Date
- Nov 2, 1936, 8:46 PM UTC
- Cause
- Earthquake
- Magnitude
- M7.7
- Depth
- 40 km
- Maximum documented water height
- 0.70 m
- Observation records
- 10
- Countries affected
- 1
It was triggered by a magnitude 7.7 earthquake at a depth of 40 km.
The highest documented water height was 0.70 m.
10 observation sites in 1 countries are recorded.
Map of observation sites
10Each 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 2, 1936, 8:46 PM UTC
- 0:00 hJapan · Onagawa · 0.34 m
9 places with a documented arrival time
Observations by country
| Country | Observation records | Maximum documented water height | Deaths | Earliest arrival |
|---|---|---|---|---|
| Japan | 10 | 0.34 m Onagawa | — | 0:00 h |
Highest documented water heights
10 / 10Individual 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 |
|---|---|---|---|
| Onagawa · Miyagi | 0.34 m | 70 km | Japan |
| Miyako · Iwate | 0.30 m | 162 km | Japan |
| Kesennumagyoko · Miyagi | 0.14 m | 94 km | Japan |
| Tsukihama · Miyagi | 0.11 m | 76 km | Japan |
| Ishinomaki · Miyagi | 0.10 m | 85 km | Japan |
| Onahama · Fukushima | 0.09 m | 182 km | Japan |
| Oaraiko · Ibaraki | 0.08 m | 252 km | Japan |
| Hachinohe · Aomori | 0.05 m | 265 km | Japan |
| Oshima (Shiogamako) · Miyagi | 0.04 m | 106 km | Japan |
| Ayukawa · Miyagi | — | 62 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.