Reviewed by USGSJapan84y ago
M6.7 earthquake 146 km ENE of Hachinohe, Japan
Sunday, June 13, 1943, 08:36:58 UTC · 41.073°N, 143.062°E
A magnitude 6.7 earthquake struck 146 km ENE of Hachinohe, Japan on Sunday, June 13, 1943, 08:36:58 UTC, at a depth of 25.0 km (shallow). It is the strongest earthquake within 300 km since an M7.3 on June 13, 1943.
- Magnitude
- 6.7
- Strong · mw
- Depth
- 25 km
- Shallow
- Felt reports
- 0
- Did You Feel It?
- Est. shaking
- —
- No ShakeMap
- PAGER alert
- None
- Not issued
- Tsunami
- No flag
- USGS feed
Outlined circle: this earthquakeDashed circle: 100 km aftershock search area
In context
How big was it, and why here?
Energy released
153 kilotons of TNT
That is about 10 times the Hiroshima bomb. It released about 320 times the energy of a magnitude 5.0.
Tectonic setting
119 km
from the nearest mapped plate boundary, between the Pacific and Okhotsk plates. Earthquakes this far from a boundary happen on faults inside a plate, often less frequently but sometimes strongly.
Depth: shallow
25 km
Shallow earthquakes (under 70 km) produce the strongest surface shaking for their size, so they are the ones most likely to cause damage near the epicenter.
Did You Feel It?
Where it was felt
No “Did You Feel It?” reports have been published for this event yet. If you felt it, you can add your report on the USGS website.
I felt it — report to USGS ↗USGS PAGER estimate
Who was exposed to shaking
USGS publishes PAGER impact estimates for significant earthquakes, usually within an hour. No PAGER estimate is available for this event.
After the main event
Aftershocks within 100 km
USGS lists 3 M2.5+ earthquakes within 100 km in the following 30 days; the largest was M6.6 on June 13, 1943. Most nearby activity right after a large earthquake is aftershocks, which usually become less frequent over days and weeks.
Regional history
Past M5+ earthquakes within 300 km
USGS lists 181 M5.0+ earthquakes within 300 km before this one (catalog from 1900; older records are less complete). The strongest:
- 8.41933 Sanriku (Sanriku-oki) Earthquake, JapanMarch 2, 1933 · 245 km SE of this epicenter
- 7.978 km E of Hachinohe, JapanMarch 9, 1931 · 76 km SW of this epicenter
- 7.7277 km SSE of Kushiro, JapanMay 3, 1919 · 221 km E of this epicenter
- 7.6119 km SE of Kamaishi, JapanNovember 1, 1915 · 268 km S of this epicenter
- 7.5Near the east coast of Honshu, JapanAugust 9, 1901 · 83 km SW of this epicenter
- 7.4off the east coast of Honshu, JapanOctober 10, 1939 · 285 km S of this epicenter
- 7.379 km ENE of Miyako, JapanMay 27, 1928 · 135 km S of this epicenter
- 7.3169 km ENE of Hachinohe, JapanJune 13, 1943 · 29 km E of this epicenter
History · NOAA
Deadliest earthquakes in this area
NOAA’s significant-earthquake database lists 40 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700, which together caused about 33,015 recorded deaths. The most severe:
- 1896M8.3
Sanriku
15 Jun 1896 · 192 km away
27,122 deathsExtreme damage ($25M+)tsunami
- 1933M8.4
Sanriku
2 Mar 1933 · 245 km away
3,022 deathsExtreme damage ($25M+)tsunami
- 1766M6.9
Hirosaki
8 Mar 1766 · 199 km away
1,700 deathsSevere damage ($5–24M)tsunami
- 1793M8.3
Sanriku,Rikuzen,Rikuchu
17 Feb 1793 · 297 km away
745 deathsSevere damage ($5–24M)tsunami
- 1896
Senhoku, Ugo
31 Aug 1896 · 211 km away
206 deathsExtreme damage ($25M+)
- 1810M6.6
Oga
25 Sep 1810 · 297 km away
59 deathsSevere damage ($5–24M)tsunami
NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.