QuakeScout
Magnitude4.7

Reviewed by USGSGreece43y ago

M4.7 earthquake 8 km E of Stratónion, Greece

Friday, August 26, 1983, 12:52:09 UTC · 40.507°N, 23.921°E

A magnitude 4.7 earthquake struck 8 km E of Stratónion, Greece on Friday, August 26, 1983, 12:52:09 UTC, at a depth of 14.3 km (shallow). It is the strongest earthquake within 300 km since an M6.8 on August 6, 1983.

Magnitude
4.7
Light · mb
Depth
14 km
Shallow
Felt reports
0
Did You Feel It?
Est. shaking
IV
Light (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

169 tons of TNT

That is about 1/89 of the Hiroshima bomb. A magnitude 5.0 releases about 3 times more energy.

Tectonic setting

64 km

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

Depth: shallow

14 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 270 M5.0+ earthquakes within 300 km before this one (catalog from 1900; older records are less complete). The strongest:

  1. 7.2Aegean SeaNovember 8, 1905 · 76 km SE of this epicenter
  2. 7.225 km SE of Malkara, TurkeyAugust 9, 1912 · 271 km E of this epicenter
  3. 7.261 km W of Eresós, GreeceDecember 19, 1981 · 179 km SE of this epicenter
  4. 7.29 km NNW of Karaburun, TurkeyJuly 23, 1949 · 296 km SE of this epicenter
  5. 7.19 km S of Stara Zagora, BulgariaApril 14, 1928 · 250 km NE of this epicenter
  6. 7.13 km W of Brezovo, BulgariaApril 18, 1928 · 225 km NE of this epicenter
  7. 7.07 km SE of Stara Kresna, BulgariaApril 4, 1904 · 150 km N of this epicenter
  8. 7.055 km S of Mýrina, GreeceFebruary 19, 1968 · 154 km SE of this epicenter

History · NOAA

Deadliest earthquakes in this area

NOAA’s significant-earthquake database lists 96 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700, which together caused about 5,889 recorded deaths. The most severe:

  1. 1912M7.2

    Marmara Sea

    9 Aug 1912 · 271 km away

    2,800 deathsExtreme damage ($25M+)tsunami

  2. 1963M6.0

    Macedonia: Skopje

    26 Jul 1963 · 282 km away · intensity X

    1,070 deaths$1.0 billion damage

  3. 1867M7.0

    Mitilini; Turkey: Izmir

    7 Mar 1867 · 257 km away

    563 deathsSevere damage ($5–24M)tsunami

  4. 1894M6.7

    Locride, Malesina-Martinon (Lokris)

    20 Apr 1894 · 221 km away · intensity X

    255 deathsSevere damage ($5–24M)

  5. 1932M6.9

    Hierissos-Strantonion (Chalkidiki)

    26 Sep 1932 · 2 km away · intensity X

    161 deathsExtreme damage ($25M+)tsunami

  6. 1817M6.6

    Achaia: Aeghion

    23 Aug 1817 · 289 km away · intensity X

    128 deathsSevere damage ($5–24M)tsunami

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

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