QuakeScout
Magnitude2.7

Reviewed by USGSGreece45y ago

M2.7 earthquake 7 km ENE of Erythrés, Greece

Thursday, October 22, 1981, 22:08:02 UTC · 38.251°N, 23.401°E

A magnitude 2.7 earthquake struck 7 km ENE of Erythrés, Greece on Thursday, October 22, 1981, 22:08:02 UTC, at a depth of 33.0 km (shallow).

Magnitude
2.7
Minor · ml
Depth
33 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

169 kg of TNT

That is about 1/88,990 of the Hiroshima bomb. A magnitude 5.0 releases about 2,818 times more energy.

Tectonic setting

53 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

33 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 418 M5.0+ earthquakes within 300 km before this one (catalog from 1900; older records are less complete). The strongest:

  1. 7.9Southern GreeceAugust 11, 1903 · 253 km S of this epicenter
  2. 7.719 km SSE of Amorgós, GreeceJuly 9, 1956 · 286 km SE of this epicenter
  3. 7.34 km WNW of Koróni, GreeceOctober 6, 1947 · 207 km SW of this epicenter
  4. 7.2Aegean SeaNovember 8, 1905 · 230 km NE of this epicenter
  5. 7.29 km NNW of Karaburun, TurkeyJuly 23, 1949 · 273 km E of this epicenter
  6. 7.055 km S of Mýrina, GreeceFebruary 19, 1968 · 185 km NE of this epicenter
  7. 6.97 km NNE of Ágios Nikólaos, GreeceSeptember 26, 1932 · 231 km N of this epicenter
  8. 6.815 km ENE of Póros, GreeceAugust 12, 1953 · 215 km W of this epicenter

History · NOAA

Deadliest earthquakes in this area

NOAA’s significant-earthquake database lists 147 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700, which together caused about 28,877 recorded deaths. The most severe:

  1. 1883M7.3

    Ayvalik, Izmir, Cesme

    15 Oct 1883 · 244 km away · intensity X

    15,000 deathsExtreme damage ($25M+)

  2. 1881M7.3

    Khios; Turkey: Cesme

    3 Apr 1881 · 249 km away · intensity XI

    7,866 deathsExtreme damage ($25M+)tsunami

  3. 1750

    Morea,Cerigo

    7 Jun 1750 · 231 km away · intensity X

    2,000 deaths

  4. 1867M7.0

    Mitilini; Turkey: Izmir

    7 Mar 1867 · 281 km away

    563 deathsSevere damage ($5–24M)tsunami

  5. 1953M7.2

    Lixouri-Argostoli (Kephallenia)

    12 Aug 1953 · 227 km away · intensity X

    476 deaths$100 million damagetsunami

  6. 1820M6.9

    Zakinthos (Zante)

    29 Dec 1820 · 197 km away · intensity X

    388 deathsSevere damage ($5–24M)tsunami

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

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