Reviewed by USGSJapan121y ago
M7.3 earthquake 190 km SE of Hasaki, Japan
Friday, September 7, 1906, 18:52:28 UTC · 34.745°N, 142.542°E
A magnitude 7.3 earthquake struck 190 km SE of Hasaki, Japan on Friday, September 7, 1906, 18:52:28 UTC, at a depth of 15.0 km (shallow). No earthquake of this size or larger appears within 300 km in the USGS catalog since 1900.
- Magnitude
- 7.3
- Major · 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 earthquake
In context
How big was it, and why here?
Energy released
1.3 megatons of TNT
That is about 86 times the Hiroshima bomb. It released about 2,723 times the energy of a magnitude 5.0.
Tectonic setting
49 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 200 km
USGS has not published any M2.5+ earthquake within 200 km in the 30 days after this event.
Regional history
Past M5+ earthquakes within 300 km
USGS lists 2 M5.0+ earthquakes within 300 km before this one (catalog from 1900; older records are less complete). The strongest:
History · NOAA
Deadliest earthquakes in this area
NOAA’s significant-earthquake database lists 10 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700, which together caused about 12,150 recorded deaths. The most severe:
- 1855M7.0
Tokyo
11 Nov 1855 · 269 km away
6,757 deathsExtreme damage ($25M+)tsunami
- 1703M8.2
Off Sw Boso Peninsula
30 Dec 1703 · 234 km away
5,233 deathsExtreme damage ($25M+)tsunami
- 1853
Odawara
11 Mar 1853 · 289 km away
79 deathsSevere damage ($5–24M)
- 1905M7.0
Off Fukushima
6 Jul 1905 · 295 km away
57 deathstsunami
- 1894M7.5
Tokyo
20 Jun 1894 · 262 km away
24 deathsLimited damage (under $1M)
- 1782M7.3
Tokaido, Japan
22 Aug 1782 · 262 km away
Severe damage ($5–24M)tsunami
NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.