QuakeScout
Magnitude6.7

Reviewed by USGSJapan104y ago

M6.7 earthquake 60 km ENE of Hasaki, Japan

Friday, June 1, 1923, 20:15:46 UTC · 35.885°N, 141.473°E

A magnitude 6.7 earthquake struck 60 km ENE of Hasaki, Japan on Friday, June 1, 1923, 20:15:46 UTC, at a depth of 35.0 km (shallow). It is the strongest earthquake within 300 km since an M7.2 on June 1, 1923.

Magnitude
6.7
Strong · mw
Depth
35 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

194 kilotons of TNT

That is about 13 times the Hiroshima bomb. It released about 407 times the energy of a magnitude 5.0.

Tectonic setting

87 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

35 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 28 M5.0+ earthquakes within 300 km before this one (catalog from 1900; older records are less complete). The strongest:

  1. 7.3190 km SE of Hasaki, JapanSeptember 7, 1906 · 160 km SE of this epicenter
  2. 7.264 km ENE of Hasaki, JapanJune 1, 1923 · 6 km NE of this epicenter
  3. 7.238 km SSW of Shimoda, JapanOctober 24, 1905 · 294 km SW of this epicenter
  4. 7.1150 km ESE of Hasaki, JapanMarch 13, 1909 · 107 km SE of this epicenter
  5. 7.082 km ENE of Hasaki, JapanMarch 12, 1909 · 22 km E of this epicenter
  6. 7.0208 km SE of Katsuura, JapanApril 21, 1916 · 244 km S of this epicenter
  7. 6.870 km E of Namie, JapanJanuary 15, 1908 · 191 km N of this epicenter
  8. 6.7136 km SSE of Katsuura, JapanSeptember 15, 1916 · 219 km S of this epicenter

History · NOAA

Deadliest earthquakes in this area

NOAA’s significant-earthquake database lists 21 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700, which together caused about 118,978 recorded deaths. The most severe:

  1. 1923M7.9

    Tokyo, Yokohama

    1 Sep 1923 · 199 km away

    105,385 deaths$600 million damagetsunami

  2. 1855M7.0

    Tokyo

    11 Nov 1855 · 153 km away

    6,757 deathsExtreme damage ($25M+)tsunami

  3. 1703M8.2

    Off Sw Boso Peninsula

    30 Dec 1703 · 166 km away

    5,233 deathsExtreme damage ($25M+)tsunami

  4. 1828

    Sandyo In Etigo

    18 Dec 1828 · 251 km away

    1,443 deathsExtreme damage ($25M+)tsunami

  5. 1853

    Odawara

    11 Mar 1853 · 183 km away

    79 deathsSevere damage ($5–24M)

  6. 1905M7.0

    Off Fukushima

    6 Jul 1905 · 196 km away

    57 deathstsunami

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

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