QuakeScout
Magnitude7.5

Reviewed by USGSTurkey84y ago

M7.5 earthquake 6 km SSE of Ilgaz, Turkey

Friday, November 26, 1943, 22:20:48 UTC · 40.867°N, 33.651°E

A magnitude 7.5 earthquake struck 6 km SSE of Ilgaz, Turkey on Friday, November 26, 1943, 22:20:48 UTC, at a depth of 20.0 km (shallow). No earthquake of this size or larger appears within 300 km in the USGS catalog since 1900.

Magnitude
7.5
Major · mw
Depth
20 km
Shallow
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

2.7 megatons of TNT

That is about 178 times the Hiroshima bomb. It released about 5,623 times the energy of a magnitude 5.0.

Tectonic setting

21 km

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

Depth: shallow

20 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 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 46 M5.0+ earthquakes within 300 km before this one (catalog from 1900; older records are less complete). The strongest:

  1. 7.013 km SE of Ayvacık, TurkeyDecember 20, 1942 · 260 km E of this epicenter
  2. 6.626 km NE of Kaman, TurkeyApril 19, 1938 · 149 km S of this epicenter
  3. 6.515 km ENE of İskilip, TurkeyJune 25, 1910 · 83 km E of this epicenter
  4. 6.4TurkeyJune 20, 1943 · 267 km W of this epicenter
  5. 6.215 km N of Saraykent, TurkeyJuly 30, 1940 · 193 km SE of this epicenter
  6. 6.125 km ESE of Safranbolu, TurkeyJune 9, 1919 · 66 km NW of this epicenter
  7. 6.015 km S of Kulu, TurkeySeptember 26, 1921 · 219 km S of this epicenter
  8. 6.0TurkeyDecember 11, 1942 · 120 km E of this epicenter

History · NOAA

Deadliest earthquakes in this area

NOAA’s significant-earthquake database lists 15 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700, which together caused about 6,441 recorded deaths. The most severe:

  1. 1943M7.5

    Ladik, Samsun, Havza

    26 Nov 1943 · 0 km away · intensity XI

    4,020 deathsExtreme damage ($25M+)

  2. 1942M7.0

    Niksar, Erbaa

    20 Dec 1942 · 260 km away · intensity X

    1,000 deathsExtreme damage ($25M+)

  3. 1866M7.2

    Goynuk

    12 May 1866 · 247 km away · intensity IX

    675 deathsSevere damage ($5–24M)

  4. 1943M6.4

    Hendek, Adapazari

    20 Jun 1943 · 267 km away · intensity X

    285 deathsSevere damage ($5–24M)

  5. 1938M6.6

    Kirsehir

    19 Apr 1938 · 149 km away · intensity X

    224 deathsSevere damage ($5–24M)

  6. 1844

    Osmancik, Ankara

    12 May 1844 · 97 km away · intensity IX

    200 deathsSevere damage ($5–24M)

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

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