Reviewed by USGSJapan54y ago
M3.7 earthquake 228 km SSE of Tateyama, Japan
Sunday, June 24, 1973, 15:17:47 UTC · 33.165°N, 141.027°E
A magnitude 3.7 earthquake struck 228 km SSE of Tateyama, Japan on Sunday, June 24, 1973, 15:17:47 UTC, at a depth of 33.0 km (shallow).
- Magnitude
- 3.7
- Minor · mb
- Depth
- 33 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: 50 km aftershock search area
In context
How big was it, and why here?
Energy released
5 tons of TNT
That is about 1/2,814 of the Hiroshima bomb. A magnitude 5.0 releases about 89 times more energy.
Tectonic setting
60 km
from the nearest mapped plate boundary, between the North American and African plates. Earthquakes cluster along boundaries like this one, where plates collide, pull apart or slide past each other.
Depth: shallow
33 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 50 km
USGS lists 4 M2.5+ earthquakes within 50 km in the following 30 days; the largest was M4.4 on July 5, 1973. 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 240 M5.0+ earthquakes within 300 km before this one (catalog from 1900; older records are less complete). The strongest:
- 8.05 km SSE of Ōiso, JapanSeptember 1, 1923 · 281 km NW of this epicenter
- 7.9174 km SE of Katsuura, JapanNovember 25, 1953 · 109 km NE of this epicenter
- 7.85 km E of Tateyama, JapanSeptember 2, 1923 · 226 km NW of this epicenter
- 7.450 km SSW of Ōyama, JapanJanuary 21, 1906 · 300 km NW of this epicenter
- 7.3206 km SSE of Wada, JapanDecember 4, 1972 · 23 km NW of this epicenter
- 7.3190 km SE of Hasaki, JapanSeptember 7, 1906 · 224 km NE of this epicenter
- 7.238 km SSW of Shimoda, JapanOctober 24, 1905 · 240 km NW of this epicenter
- 7.2193 km SSE of Wada, JapanFebruary 29, 1972 · 34 km N of this epicenter
History · NOAA
Deadliest earthquakes in this area
NOAA’s significant-earthquake database lists 23 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700, which together caused about 117,755 recorded deaths. The most severe:
- 1923M7.9
Tokyo, Yokohama
1 Sep 1923 · 257 km away
105,385 deaths$600 million damagetsunami
- 1855M7.0
Tokyo
11 Nov 1855 · 298 km away
6,757 deathsExtreme damage ($25M+)tsunami
- 1703M8.2
Off Sw Boso Peninsula
30 Dec 1703 · 225 km away
5,233 deathsExtreme damage ($25M+)tsunami
- 1930M7.1
Honshu: Idu
25 Nov 1930 · 277 km away
259 deathsExtreme damage ($25M+)
- 1853
Odawara
11 Mar 1853 · 295 km away
79 deathsSevere damage ($5–24M)
- 1894M7.5
Tokyo
20 Jun 1894 · 300 km away
24 deathsLimited damage (under $1M)
NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.