Reviewed by USGSJapan94y ago
M5.9 earthquake 133 km E of Miyako, Japan
Wednesday, March 8, 1933, 01:35:39 UTC · 39.790°N, 143.482°E
A magnitude 5.9 earthquake struck 133 km E of Miyako, Japan on Wednesday, March 8, 1933, 01:35:39 UTC, at a depth of 15.0 km (shallow). It is the strongest earthquake within 300 km since an M6.0 on March 3, 1933.
- Magnitude
- 5.9
- Moderate · mw
- Depth
- 15 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: 75 km aftershock search area
In context
How big was it, and why here?
Energy released
11 kilotons of TNT
That is about the energy of the Hiroshima bomb. It released about 22 times the energy of a magnitude 5.0.
Tectonic setting
63 km
from the nearest mapped plate boundary, between the Pacific and Okhotsk plates. Earthquakes cluster along boundaries like this one, where plates collide, pull apart or slide past each other.
Depth: shallow
15 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 75 km
USGS lists 1 M2.5+ earthquake within 75 km in the following 30 days; the largest was M5.8 on March 12, 1933. 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 117 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 · 115 km SE of this epicenter
- 7.978 km E of Hachinohe, JapanMarch 9, 1931 · 127 km NW of this epicenter
- 7.7277 km SSE of Kushiro, JapanMay 3, 1919 · 206 km NE of this epicenter
- 7.7217 km ESE of Kamaishi, JapanJuly 6, 1905 · 162 km S of this epicenter
- 7.6119 km SE of Kamaishi, JapanNovember 1, 1915 · 132 km S of this epicenter
- 7.5Near the east coast of Honshu, JapanAugust 9, 1901 · 135 km NW of this epicenter
- 7.379 km ENE of Miyako, JapanMay 27, 1928 · 57 km W of this epicenter
- 7.2Near the east coast of Honshu, JapanAugust 9, 1901 · 115 km NW of this epicenter
History · NOAA
Deadliest earthquakes in this area
NOAA’s significant-earthquake database lists 34 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700, which together caused about 32,896 recorded deaths. The most severe:
- 1896M8.3
Sanriku
15 Jun 1896 · 55 km away
27,122 deathsExtreme damage ($25M+)tsunami
- 1933M8.4
Sanriku
2 Mar 1933 · 115 km away
3,022 deathsExtreme damage ($25M+)tsunami
- 1766M6.9
Hirosaki
8 Mar 1766 · 266 km away
1,700 deathsSevere damage ($5–24M)tsunami
- 1793M8.3
Sanriku,Rikuzen,Rikuchu
17 Feb 1793 · 150 km away
745 deathsSevere damage ($5–24M)tsunami
- 1896
Senhoku, Ugo
31 Aug 1896 · 213 km away
206 deathsExtreme damage ($25M+)
- 1905M7.0
Off Fukushima
6 Jul 1905 · 277 km away
57 deathstsunami
NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.