Reviewed by USGSGreece80y ago
M7.3 earthquake 4 km WNW of Koróni, Greece
Monday, October 6, 1947, 19:55:37 UTC · 36.808°N, 21.916°E
A magnitude 7.3 earthquake struck 4 km WNW of Koróni, Greece on Monday, October 6, 1947, 19:55:37 UTC, at a depth of 15.0 km (shallow). It is the strongest earthquake within 300 km since an M7.9 on August 11, 1903.
- Magnitude
- 7.3
- Major · mw
- Depth
- 15 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
1.3 megatons of TNT
That is about 89 times the Hiroshima bomb. It released about 2,818 times the energy of a magnitude 5.0.
Tectonic setting
55 km
from the nearest mapped plate boundary, between the Aegean Sea and African plates. Earthquakes cluster along boundaries like this one, where plates collide, pull apart or slide past each other.
Depth: shallow
15 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 128 M5.0+ earthquakes within 300 km before this one (catalog from 1900; older records are less complete). The strongest:
- 7.9Southern GreeceAugust 11, 1903 · 132 km SE of this epicenter
- 6.56 km N of Tríkeri, GreeceJanuary 20, 1905 · 280 km N of this epicenter
- 6.532 km NNW of Lixoúri, GreeceAugust 7, 1915 · 231 km NW of this epicenter
- 6.521 km SW of Lixoúri, GreeceJanuary 27, 1915 · 202 km NW of this epicenter
- 6.411 km W of Kyllíni, GreeceJanuary 24, 1912 · 148 km NW of this epicenter
- 6.334 km NW of Itháki, GreeceAugust 10, 1915 · 236 km NW of this epicenter
- 6.329 km SSW of Asopós, GreeceJuly 1, 1927 · 80 km SE of this epicenter
- 6.326 km NNW of Itháki, GreeceNovember 27, 1914 · 229 km NW of this epicenter
History · NOAA
Deadliest earthquakes in this area
NOAA’s significant-earthquake database lists 80 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700, which together caused about 4,429 recorded deaths. The most severe:
- 1750
Morea,Cerigo
7 Jun 1750 · 118 km away · intensity X
2,000 deaths
- 1820M6.9
Zakinthos (Zante)
29 Dec 1820 · 120 km away · intensity X
388 deathsSevere damage ($5–24M)tsunami
- 1886M6.8
Triphylie (Peleponese), Philiatra
27 Aug 1886 · 38 km away · intensity X
326 deathsSevere damage ($5–24M)tsunami
- 1767M6.7
Kefalonia
11 Jul 1767 · 207 km away · intensity X
303 deathsSevere damage ($5–24M)
- 1894M6.7
Locride, Malesina-Martinon (Lokris)
20 Apr 1894 · 229 km away · intensity X
255 deathsSevere damage ($5–24M)
- 1867M7.2
Cephalonia
4 Feb 1867 · 206 km away · intensity X
223 deathsSevere damage ($5–24M)tsunami
NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.