QuakeScout
Magnitude7.9

Reviewed by USGSJapan116y ago

M7.9 earthquake 108 km NW of Naze, Japan

Thursday, June 15, 1911, 14:25:58 UTC · 29.141°N, 128.803°E

A magnitude 7.9 earthquake struck 108 km NW of Naze, Japan on Thursday, June 15, 1911, 14:25:58 UTC, at a depth of 150.0 km (intermediate). No earthquake of this size or larger appears within 300 km in the USGS catalog since 1900.

Magnitude
7.9
Major · mw
Depth
150 km
Intermediate
Felt reports
0
Did You Feel It?
Est. shaking
VII
Very strong (ShakeMap)
PAGER alert
None
Not issued
Tsunami
No flag
USGS feed

Outlined circle: this earthquakeColoured lines: estimated shaking intensity (USGS ShakeMap)

In context

How big was it, and why here?

Energy released

11 megatons of TNT

That is about 709 times the Hiroshima bomb. It released about 22,387 times the energy of a magnitude 5.0.

Tectonic setting

1 km

from the nearest mapped plate boundary, between the Yangtze and Okinawa plates. Earthquakes cluster along boundaries like this one, where plates collide, pull apart or slide past each other.

Depth: intermediate

150 km

Intermediate-depth earthquakes usually break inside a plate that is sinking into the mantle. Shaking spreads over a wide area but is gentler at the epicenter than a shallow quake of the same size.

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 3 M5.0+ earthquakes within 300 km before this one (catalog from 1900; older records are less complete). The strongest:

  1. 7.2Ryukyu Islands, JapanJune 24, 1901 · 173 km SE of this epicenter
  2. 6.546 km SE of Koshima, JapanMarch 10, 1909 · 219 km NE of this epicenter
  3. 5.868 km N of Naze, JapanSeptember 10, 1909 · 60 km E of this epicenter

History · NOAA

Deadliest earthquakes in this area

NOAA’s significant-earthquake database lists 3 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700, which together caused about 12 recorded deaths. The most severe:

  1. 1911M8.0

    Ryukyu Islands

    15 Jun 1911 · 173 km away

    12 deathsSevere damage ($5–24M)tsunami

  2. 1901M7.9

    Ryukyu Islands

    24 Jun 1901 · 265 km away

    Limited damage (under $1M)tsunami

  3. 1904M7.9

    Kyushu

    24 Aug 1904 · 150 km away

NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.

Nearby trackers

Closest city pages