Reviewed by USGSGreece22y ago
M2.8 earthquake 1 km NE of Megalochóri, Greece
Thursday, September 30, 2004, 14:37:59 UTC · 37.720°N, 23.360°E
A magnitude 2.8 earthquake struck 1 km NE of Megalochóri, Greece on Thursday, September 30, 2004, 14:37:59 UTC, at a depth of 48.0 km (shallow).
- Magnitude
- 2.8
- Minor · md
- Depth
- 48 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
239 kg of TNT
That is about 1/63,000 of the Hiroshima bomb. A magnitude 5.0 releases about 1,995 times more energy.
Tectonic setting
82 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
48 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 M2.8 on October 23, 2004. Most nearby activity right after a large earthquake is aftershocks, which usually become less frequent over days and weeks.
- 2.610 km E of Vathý, Greece22y ago · 22 km E of this epicenter
- 2.76 km E of Vathý, Greece22y ago · 17 km E of this epicenter
- 2.84 km NNW of Vlycháda, Greece22y ago · 38 km N of this epicenter
- 2.57 km WSW of Vouliagméni, Greece22y ago · 31 km E of this epicenter
- 2.56 km NNE of Póros, Greece22y ago · 22 km SE of this epicenter
- 2.85 km SSE of Athíkia, Greece22y ago · 36 km W of this epicenter
Regional history
Past M5+ earthquakes within 300 km
USGS lists 520 M5.0+ earthquakes within 300 km before this one (catalog from 1900; older records are less complete). The strongest:
- 7.9Southern GreeceAugust 11, 1903 · 194 km S of this epicenter
- 7.719 km SSE of Amorgós, GreeceJuly 9, 1956 · 258 km SE of this epicenter
- 7.34 km WNW of Koróni, GreeceOctober 6, 1947 · 163 km SW of this epicenter
- 7.2Aegean SeaNovember 8, 1905 · 286 km N of this epicenter
- 7.261 km W of Eresós, GreeceDecember 19, 1981 · 235 km NE of this epicenter
- 7.29 km NNW of Karaburun, TurkeyJuly 23, 1949 · 294 km NE of this epicenter
- 7.026 km SW of Lixoúri, GreeceJanuary 17, 1983 · 277 km W of this epicenter
- 7.055 km S of Mýrina, GreeceFebruary 19, 1968 · 232 km NE of this epicenter
History · NOAA
Deadliest earthquakes in this area
NOAA’s significant-earthquake database lists 155 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700, which together caused about 31,284 recorded deaths. The most severe:
- 1883M7.3
Ayvalik, Izmir, Cesme
15 Oct 1883 · 257 km away · intensity X
15,000 deathsExtreme damage ($25M+)
- 1881M7.3
Khios; Turkey: Cesme
3 Apr 1881 · 260 km away · intensity XI
7,866 deathsExtreme damage ($25M+)tsunami
- 1810
Crete: Iraklion (Candia)
16 Feb 1810 · 287 km away · intensity X
3,000 deathsSevere damage ($5–24M)tsunami
- 1750
Morea,Cerigo
7 Jun 1750 · 172 km away · intensity X
2,000 deaths
- 1953M7.2
Lixouri-Argostoli (Kephallenia)
12 Aug 1953 · 233 km away · intensity X
476 deaths$100 million damagetsunami
- 1820M6.9
Zakinthos (Zante)
29 Dec 1820 · 186 km away · intensity X
388 deathsSevere damage ($5–24M)tsunami
NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.