Reviewed by USGSJapan115y ago
M6.3 earthquake 97 km SSW of Muroto-misakicho, Japan
Wednesday, April 2, 1913, 23:52:39 UTC · 32.448°N, 133.859°E
A magnitude 6.3 earthquake struck 97 km SSW of Muroto-misakicho, Japan on Wednesday, April 2, 1913, 23:52:39 UTC, at a depth of 15.0 km (shallow). It is the strongest earthquake within 300 km since an M6.7 on January 5, 1913.
- Magnitude
- 6.3
- Strong · 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
51 kilotons of TNT
That is about 3 times the Hiroshima bomb. It released about 106 times the energy of a magnitude 5.0.
Tectonic setting
63 km
from the nearest mapped plate boundary, between the Amur and Philippine Sea 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 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 5 M5.0+ earthquakes within 300 km before this one (catalog from 1900; older records are less complete). The strongest:
- 7.518 km SE of Honmachi, JapanNovember 10, 1909 · 292 km W of this epicenter
- 6.931 km SSW of Hikari, JapanJune 2, 1905 · 241 km NW of this epicenter
- 6.7120 km E of Nishinoomote, JapanJanuary 5, 1913 · 243 km SW of this epicenter
- 6.636 km E of Nobeoka, JapanMarch 13, 1906 · 170 km W of this epicenter
- 6.024 km SE of Fukura, JapanMay 4, 1906 · 207 km NE of this epicenter
History · NOAA
Deadliest earthquakes in this area
NOAA’s significant-earthquake database lists 13 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700, which together caused about 9,031 recorded deaths. The most severe:
- 1707M8.4
Nankaido
28 Oct 1707 · 121 km away
5,000 deathsExtreme damage ($25M+)tsunami
- 1854M8.4
Nankaido
24 Dec 1854 · 129 km away
3,000 deathsExtreme damage ($25M+)tsunami
- 1711M6.7
Seionaikai, Japan
20 Dec 1711 · 206 km away
1,000 deathsSevere damage ($5–24M)tsunami
- 1889M6.3
Kumamoto
28 Jul 1889 · 298 km away
20 deathsLimited damage (under $1M)
- 1905M7.8
Aki
2 Jun 1905 · 244 km away
11 deathsLimited damage (under $1M)
- 1769M7.4
Sw. Kyushu Island, Japan
29 Aug 1769 · 175 km away
Moderate damage ($1–5M)tsunami
NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.