Reviewed by USGSGreece43y ago
M4.5 earthquake 34 km NW of Mýrina, Greece
Sunday, October 30, 1983, 03:50:56 UTC · 40.110°N, 24.808°E
A magnitude 4.5 earthquake struck 34 km NW of Mýrina, Greece on Sunday, October 30, 1983, 03:50:56 UTC, at a depth of 11.6 km (shallow). It is the strongest earthquake within 300 km since an M4.6 on October 28, 1983.
- Magnitude
- 4.5
- Light · mb
- Depth
- 12 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
3 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
12 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 6 M2.5+ earthquakes within 50 km in the following 30 days; the largest was M4.4 on October 31, 1983. Most nearby activity right after a large earthquake is aftershocks, which usually become less frequent over days and weeks.
- 3.733 km NW of Mýrina, Greece43y ago · 1 km NE of this epicenter
- 3.536 km NNW of Mýrina, Greece43y ago · 17 km NE of this epicenter
- 4.341 km ESE of Sykiá, Greece43y ago · 45 km SW of this epicenter
- 4.444 km ESE of Sykiá, Greece43y ago · 48 km SW of this epicenter
- 3.543 km SSE of Karyes, Greece43y ago · 42 km SW of this epicenter
- 4.346 km SSE of Karyes, Greece43y ago · 41 km SW of this epicenter
Regional history
Past M5+ earthquakes within 300 km
USGS lists 271 M5.0+ earthquakes within 300 km before this one (catalog from 1900; older records are less complete). The strongest:
- 7.37 km N of Gönen, TurkeyMarch 18, 1953 · 242 km E of this epicenter
- 7.2Aegean SeaNovember 8, 1905 · 16 km W of this epicenter
- 7.225 km SE of Malkara, TurkeyAugust 9, 1912 · 208 km E of this epicenter
- 7.261 km W of Eresós, GreeceDecember 19, 1981 · 103 km S of this epicenter
- 7.29 km NNW of Karaburun, TurkeyJuly 23, 1949 · 211 km SE of this epicenter
- 7.19 km S of Stara Zagora, BulgariaApril 14, 1928 · 259 km N of this epicenter
- 7.13 km W of Brezovo, BulgariaApril 18, 1928 · 250 km N of this epicenter
- 7.07 km SE of Stara Kresna, BulgariaApril 4, 1904 · 225 km NW of this epicenter
History · NOAA
Deadliest earthquakes in this area
NOAA’s significant-earthquake database lists 88 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700, which together caused about 28,571 recorded deaths. The most severe:
- 1883M7.3
Ayvalik, Izmir, Cesme
15 Oct 1883 · 234 km away · intensity X
15,000 deathsExtreme damage ($25M+)
- 1881M7.3
Khios; Turkey: Cesme
3 Apr 1881 · 241 km away · intensity XI
7,866 deathsExtreme damage ($25M+)tsunami
- 1912M7.2
Marmara Sea
9 Aug 1912 · 208 km away
2,800 deathsExtreme damage ($25M+)tsunami
- 1953M7.3
Yenice, Onon
18 Mar 1953 · 242 km away
1,070 deaths$4 million damage
- 1867M7.0
Mitilini; Turkey: Izmir
7 Mar 1867 · 170 km away
563 deathsSevere damage ($5–24M)tsunami
- 1894M6.7
Locride, Malesina-Martinon (Lokris)
20 Apr 1894 · 217 km away · intensity X
255 deathsSevere damage ($5–24M)
NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.