Reviewed by USGSGreece22y ago
M2.5 earthquake 6 km NNE of Póros, Greece
Tuesday, October 19, 2004, 21:35:53 UTC · 37.550°N, 23.480°E
A magnitude 2.5 earthquake struck 6 km NNE of Póros, Greece on Tuesday, October 19, 2004, 21:35:53 UTC, at a depth of 19.0 km (shallow).
- Magnitude
- 2.5
- Minor · ml
- Depth
- 19 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 kg of TNT
That is about 1/177,558 of the Hiroshima bomb. A magnitude 5.0 releases about 5,623 times more energy.
Tectonic setting
104 km
from the nearest mapped plate boundary, between the Aegean Sea and Eurasian plates. Earthquakes this far from a boundary happen on faults inside a plate, often less frequently but sometimes strongly.
Depth: shallow
19 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 M2.8 on November 3, 2004. Most nearby activity right after a large earthquake is aftershocks, which usually become less frequent over days and weeks.
- 2.70 km ESE of Keratsíni, Greece22y ago · 47 km N of this epicenter
- 2.66 km WSW of Glyfáda, Greece22y ago · 38 km NE of this epicenter
- 2.86 km WSW of Glyfáda, Greece22y ago · 38 km NE of this epicenter
- 2.65 km SSW of Palaió Fáliro, Greece22y ago · 41 km NE of this epicenter
- 2.610 km E of Vathý, Greece22y ago · 28 km N of this epicenter
- 2.76 km E of Vathý, Greece22y ago · 24 km N of this epicenter
- 2.57 km WSW of Vouliagméni, Greece22y ago · 32 km NE of this epicenter
Regional history
Past M5+ earthquakes within 300 km
USGS lists 504 M5.0+ earthquakes within 300 km before this one (catalog from 1900; older records are less complete). The strongest:
- 7.9Southern GreeceAugust 11, 1903 · 178 km S of this epicenter
- 7.719 km SSE of Amorgós, GreeceJuly 9, 1956 · 241 km SE of this epicenter
- 7.34 km WNW of Koróni, GreeceOctober 6, 1947 · 161 km SW of this epicenter
- 7.2Aegean SeaNovember 8, 1905 · 300 km N of this epicenter
- 7.261 km W of Eresós, GreeceDecember 19, 1981 · 242 km NE of this epicenter
- 7.29 km NNW of Karaburun, TurkeyJuly 23, 1949 · 293 km NE of this epicenter
- 7.026 km SW of Lixoúri, GreeceJanuary 17, 1983 · 291 km W of this epicenter
- 7.055 km S of Mýrina, GreeceFebruary 19, 1968 · 242 km NE of this epicenter
History · NOAA
Deadliest earthquakes in this area
NOAA’s significant-earthquake database lists 152 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 · 253 km away · intensity X
15,000 deathsExtreme damage ($25M+)
- 1881M7.3
Khios; Turkey: Cesme
3 Apr 1881 · 255 km away · intensity XI
7,866 deathsExtreme damage ($25M+)tsunami
- 1810
Crete: Iraklion (Candia)
16 Feb 1810 · 265 km away · intensity X
3,000 deathsSevere damage ($5–24M)tsunami
- 1750
Morea,Cerigo
7 Jun 1750 · 156 km away · intensity X
2,000 deaths
- 1953M7.2
Lixouri-Argostoli (Kephallenia)
12 Aug 1953 · 249 km away · intensity X
476 deaths$100 million damagetsunami
- 1820M6.9
Zakinthos (Zante)
29 Dec 1820 · 198 km away · intensity X
388 deathsSevere damage ($5–24M)tsunami
NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.