QuakeScout
Magnitude3.6

Reviewed by USGSGreece43y ago

M3.6 earthquake 2 km W of Pátra, Greece

Sunday, August 7, 1983, 19:49:25 UTC · 38.240°N, 21.703°E

A magnitude 3.6 earthquake struck 2 km W of Pátra, Greece on Sunday, August 7, 1983, 19:49:25 UTC, at a depth of 33.0 km (shallow).

Magnitude
3.6
Minor · mb
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

4 tons of TNT

That is about 1/3,975 of the Hiroshima bomb. A magnitude 5.0 releases about 126 times more energy.

Tectonic setting

18 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 419 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 · 274 km SE of this epicenter
  2. 7.34 km WNW of Koróni, GreeceOctober 6, 1947 · 160 km S of this epicenter
  3. 7.026 km SW of Lixoúri, GreeceJanuary 17, 1983 · 131 km W of this epicenter
  4. 6.97 km NNE of Ágios Nikólaos, GreeceSeptember 26, 1932 · 289 km NE of this epicenter
  5. 6.815 km ENE of Póros, GreeceAugust 12, 1953 · 67 km W of this epicenter
  6. 6.86 km SW of Galaxídhion, GreeceMarch 31, 1965 · 55 km E of this epicenter
  7. 6.828 km SSE of Karyes, GreeceJanuary 18, 1982 · 299 km NE of this epicenter
  8. 6.7Ionian SeaNovember 15, 1959 · 109 km SW of this epicenter

History · NOAA

Deadliest earthquakes in this area

NOAA’s significant-earthquake database lists 141 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700, which together caused about 5,646 recorded deaths. The most severe:

  1. 1750

    Morea,Cerigo

    7 Jun 1750 · 254 km away · intensity X

    2,000 deaths

  2. 1953M7.2

    Lixouri-Argostoli (Kephallenia)

    12 Aug 1953 · 79 km away · intensity X

    476 deaths$100 million damagetsunami

  3. 1820M6.9

    Zakinthos (Zante)

    29 Dec 1820 · 67 km away · intensity X

    388 deathsSevere damage ($5–24M)tsunami

  4. 1886M6.8

    Triphylie (Peleponese), Philiatra

    27 Aug 1886 · 127 km away · intensity X

    326 deathsSevere damage ($5–24M)tsunami

  5. 1767M6.7

    Kefalonia

    11 Jul 1767 · 108 km away · intensity X

    303 deathsSevere damage ($5–24M)

  6. 1894M6.7

    Locride, Malesina-Martinon (Lokris)

    20 Apr 1894 · 136 km away · intensity X

    255 deathsSevere damage ($5–24M)

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

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