QuakeScout
Magnitude4.3

Reviewed by USGSJapan34y ago

M4.3 earthquake 51 km SE of Shizunai-furukawachō, Japan

Thursday, February 11, 1993, 03:47:54 UTC · 41.963°N, 142.745°E

A magnitude 4.3 earthquake struck 51 km SE of Shizunai-furukawachō, Japan on Thursday, February 11, 1993, 03:47:54 UTC, at a depth of 67.6 km (shallow).

Magnitude
4.3
Light · mb
Depth
68 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

43 tons of TNT

That is about 1/354 of the Hiroshima bomb. A magnitude 5.0 releases about 11 times more energy.

Tectonic setting

187 km

from the nearest mapped plate boundary, between the Pacific and Okhotsk plates. Earthquakes this far from a boundary happen on faults inside a plate, often less frequently but sometimes strongly.

Depth: shallow

68 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 50 km

USGS has not published any M2.5+ earthquake within 50 km in the 30 days after this event.

Regional history

Past M5+ earthquakes within 300 km

USGS lists 841 M5.0+ earthquakes within 300 km before this one (catalog from 1900; older records are less complete). The strongest:

  1. 8.21968 Tokachi-Oki EarthquakeMay 16, 1968 · 130 km SE of this epicenter
  2. 8.11952 Tokachi-Oki EarthquakeMarch 4, 1952 · 96 km E of this epicenter
  3. 8.0113 km ENE of Miyako, JapanMarch 20, 1960 · 236 km S of this epicenter
  4. 7.978 km E of Hachinohe, JapanMarch 9, 1931 · 155 km S of this epicenter
  5. 7.970 km S of Honchō, JapanMay 16, 1968 · 53 km S of this epicenter
  6. 7.7277 km SSE of Kushiro, JapanMay 3, 1919 · 281 km SE of this epicenter
  7. 7.719 km ESE of Nemuro, JapanJune 17, 1973 · 286 km NE of this epicenter
  8. 7.652 km NE of Otofuke, JapanJanuary 15, 1993 · 168 km NE of this epicenter

History · NOAA

Deadliest earthquakes in this area

NOAA’s significant-earthquake database lists 56 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700, which together caused about 29,413 recorded deaths. The most severe:

  1. 1896M8.3

    Sanriku

    15 Jun 1896 · 294 km away

    27,122 deathsExtreme damage ($25M+)tsunami

  2. 1766M6.9

    Hirosaki

    8 Mar 1766 · 207 km away

    1,700 deathsSevere damage ($5–24M)tsunami

  3. 1896

    Senhoku, Ugo

    31 Aug 1896 · 263 km away

    206 deathsExtreme damage ($25M+)

  4. 1982M6.7

    Hokkaido, Urakawa, Hiroo

    21 Mar 1982 · 38 km away · intensity X

    110 deaths$1 million damagetsunami

  5. 1704

    N Of Nosiro

    27 May 1704 · 291 km away

    58 deathsSevere damage ($5–24M)

  6. 1968M8.2

    Off East Coast Of Honshu Island

    16 May 1968 · 135 km away · intensity VI

    52 deaths$131 million damagetsunami

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

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