Reviewed by USGSGreece44y ago
M4.5 earthquake 61 km ENE of Skýros, Greece
Friday, July 23, 1982, 00:38:48 UTC · 39.054°N, 25.242°E
A magnitude 4.5 earthquake struck 61 km ENE of Skýros, Greece on Friday, July 23, 1982, 00:38:48 UTC, at a depth of 25.7 km (shallow). It is the strongest earthquake within 300 km since an M4.5 on July 8, 1982.
- Magnitude
- 4.5
- Light · mb
- Depth
- 26 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 earthquakeDashed circle: 50 km aftershock search area
In context
How big was it, and why here?
Energy released
85 tons of TNT
That is about 1/178 of the Hiroshima bomb. A magnitude 5.0 releases about 6 times more energy.
Tectonic setting
90 km
from the nearest mapped plate boundary, between the Aegean Sea and Anatolian plates. Earthquakes cluster along boundaries like this one, where plates collide, pull apart or slide past each other.
Depth: shallow
26 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 lists 7 M2.5+ earthquakes within 50 km in the following 30 days; the largest was M4.1 on August 6, 1982. Most nearby activity right after a large earthquake is aftershocks, which usually become less frequent over days and weeks.
- 3.753 km W of Eresós, Greece44y ago · 13 km NE of this epicenter
- 3.625 km WNW of Eresós, Greece44y ago · 44 km NE of this epicenter
- 3.527 km ESE of Skýros, Greece44y ago · 47 km SW of this epicenter
- 4.138 km WSW of Eresós, Greece44y ago · 23 km E of this epicenter
- 3.636 km ESE of Skýros, Greece44y ago · 36 km SW of this epicenter
- 3.143 km ESE of Skýros, Greece44y ago · 36 km SW of this epicenter
- 3.058 km ENE of Skýros, Greece44y ago · 4 km SW of this epicenter
Regional history
Past M5+ earthquakes within 300 km
USGS lists 284 M5.0+ earthquakes within 300 km before this one (catalog from 1900; older records are less complete). The strongest:
- 7.719 km SSE of Amorgós, GreeceJuly 9, 1956 · 273 km S of this epicenter
- 7.37 km N of Gönen, TurkeyMarch 18, 1953 · 241 km NE of this epicenter
- 7.2Aegean SeaNovember 8, 1905 · 127 km NW of this epicenter
- 7.225 km SE of Malkara, TurkeyAugust 9, 1912 · 246 km NE of this epicenter
- 7.261 km W of Eresós, GreeceDecember 19, 1981 · 21 km N of this epicenter
- 7.29 km NNW of Karaburun, TurkeyJuly 23, 1949 · 113 km E of this epicenter
- 7.03 km ESE of Soma, TurkeyNovember 18, 1919 · 208 km E of this epicenter
- 7.05 km NNW of Kéfalos, GreeceJune 26, 1926 · 292 km SE of this epicenter
History · NOAA
Deadliest earthquakes in this area
NOAA’s significant-earthquake database lists 104 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700, which together caused about 28,890 recorded deaths. The most severe:
- 1883M7.3
Ayvalik, Izmir, Cesme
15 Oct 1883 · 118 km away · intensity X
15,000 deathsExtreme damage ($25M+)
- 1881M7.3
Khios; Turkey: Cesme
3 Apr 1881 · 125 km away · intensity XI
7,866 deathsExtreme damage ($25M+)tsunami
- 1912M7.2
Marmara Sea
9 Aug 1912 · 246 km away
2,800 deathsExtreme damage ($25M+)tsunami
- 1953M7.3
Yenice, Onon
18 Mar 1953 · 241 km away
1,070 deaths$4 million damage
- 1867M7.0
Mitilini; Turkey: Izmir
7 Mar 1867 · 101 km away
563 deathsSevere damage ($5–24M)tsunami
- 1894M6.7
Locride, Malesina-Martinon (Lokris)
20 Apr 1894 · 184 km away · intensity X
255 deathsSevere damage ($5–24M)
NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.