Reviewed by USGSJapan121y ago
M6.6 earthquake 90 km WNW of Sado, Japan
Tuesday, March 26, 1907, 11:21:26 UTC · 38.354°N, 137.461°E
A magnitude 6.6 earthquake struck 90 km WNW of Sado, Japan on Tuesday, March 26, 1907, 11:21:26 UTC, at a depth of 360.0 km (deep). No earthquake of this size or larger appears within 300 km in the USGS catalog since 1900.
- Magnitude
- 6.6
- Strong · mB
- Depth
- 360 km
- Deep
- 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
120 kilotons of TNT
That is about 8 times the Hiroshima bomb. It released about 251 times the energy of a magnitude 5.0.
Tectonic setting
35 km
from the nearest mapped plate boundary, between the Okhotsk and Amur plates. Earthquakes cluster along boundaries like this one, where plates collide, pull apart or slide past each other.
Depth: deep
360 km
Deep earthquakes (over 300 km) happen deep inside subducting plates. They rarely cause damage, but can be felt faintly over very large distances.
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 has not published any M2.5+ earthquake within 100 km in the 30 days after this event.
Regional history
Past M5+ earthquakes within 300 km
USGS lists 1 M5.0+ earthquake 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 19 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700, which together caused about 17,146 recorded deaths. The most severe:
- 1847M7.4
Zenkoji, Nagano
8 May 1847 · 158 km away
12,000 deathsExtreme damage ($25M+)
- 1751M6.6
Honshu: Nw
20 May 1751 · 140 km away
2,100 deathsExtreme damage ($25M+)tsunami
- 1828
Sandyo In Etigo
18 Dec 1828 · 202 km away
1,443 deathsExtreme damage ($25M+)tsunami
- 1894M7.0
Syonai
22 Oct 1894 · 212 km away
726 deathsSevere damage ($5–24M)tsunami
- 1804M7.3
Kisakata
10 Jul 1804 · 229 km away
450 deathsExtreme damage ($25M+)tsunami
- 1858
Hida: N
9 Apr 1858 · 262 km away
203 deathsModerate damage ($1–5M)
NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.