Reviewed by USGSGreece22y ago
M2.8 earthquake 13 km NNE of Istiaía, Greece
Sunday, July 11, 2004, 00:18:36 UTC · 39.060°N, 23.230°E
A magnitude 2.8 earthquake struck 13 km NNE of Istiaía, Greece on Sunday, July 11, 2004, 00:18:36 UTC, at a depth of 35.0 km (shallow).
- Magnitude
- 2.8
- Minor · md
- Depth
- 35 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
5 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
35 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 5 M2.5+ earthquakes within 50 km in the following 30 days; the largest was M3.2 on July 22, 2004. Most nearby activity right after a large earthquake is aftershocks, which usually become less frequent over days and weeks.
- 3.019 km N of Mantoúdi, Greece22y ago · 21 km SE of this epicenter
- 2.515 km SSW of Skiáthos, Greece22y ago · 19 km E of this epicenter
- 3.28 km ENE of Prokópi, Greece22y ago · 44 km SE of this epicenter
- 2.66 km WSW of Argalastí, Greece22y ago · 17 km NW of this epicenter
- 3.05 km NNE of Límni, Greece22y ago · 30 km S of this epicenter
Regional history
Past M5+ earthquakes within 300 km
USGS lists 531 M5.0+ earthquakes within 300 km before this one (catalog from 1900; older records are less complete). The strongest:
- 7.34 km WNW of Koróni, GreeceOctober 6, 1947 · 276 km SW of this epicenter
- 7.2Aegean SeaNovember 8, 1905 · 166 km NE of this epicenter
- 7.261 km W of Eresós, GreeceDecember 19, 1981 · 173 km E of this epicenter
- 7.29 km NNW of Karaburun, TurkeyJuly 23, 1949 · 284 km E of this epicenter
- 7.07 km SE of Stara Kresna, BulgariaApril 4, 1904 · 300 km N of this epicenter
- 7.026 km SW of Lixoúri, GreeceJanuary 17, 1983 · 285 km SW of this epicenter
- 7.055 km S of Mýrina, GreeceFebruary 19, 1968 · 154 km E of this epicenter
- 6.97 km NNE of Ágios Nikólaos, GreeceSeptember 26, 1932 · 146 km N of this epicenter
History · NOAA
Deadliest earthquakes in this area
NOAA’s significant-earthquake database lists 181 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700, which together caused about 27,150 recorded deaths. The most severe:
- 1883M7.3
Ayvalik, Izmir, Cesme
15 Oct 1883 · 271 km away · intensity X
15,000 deathsExtreme damage ($25M+)
- 1881M7.3
Khios; Turkey: Cesme
3 Apr 1881 · 277 km away · intensity XI
7,866 deathsExtreme damage ($25M+)tsunami
- 1867M7.0
Mitilini; Turkey: Izmir
7 Mar 1867 · 274 km away
563 deathsSevere damage ($5–24M)tsunami
- 1953M7.2
Lixouri-Argostoli (Kephallenia)
12 Aug 1953 · 227 km away · intensity X
476 deaths$100 million damagetsunami
- 1820M6.9
Zakinthos (Zante)
29 Dec 1820 · 226 km away · intensity X
388 deathsSevere damage ($5–24M)tsunami
- 1886M6.8
Triphylie (Peleponese), Philiatra
27 Aug 1886 · 256 km away · intensity X
326 deathsSevere damage ($5–24M)tsunami
NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.