Reviewed by USGSGreece105y ago
M6.4 earthquake 52 km SSE of Fry, Greece
Friday, August 11, 1922, 08:19:41 UTC · 34.988°N, 27.158°E
A magnitude 6.4 earthquake struck 52 km SSE of Fry, Greece on Friday, August 11, 1922, 08:19:41 UTC, at a depth of 20.0 km (shallow). No earthquake of this size or larger appears within 300 km in the USGS catalog since 1900.
- Magnitude
- 6.4
- Strong · mw
- Depth
- 20 km
- Shallow
- Felt reports
- 0
- Did You Feel It?
- Est. shaking
- V
- Moderate (ShakeMap)
- PAGER alert
- None
- Not issued
- Tsunami
- No flag
- USGS feed
Outlined circle: this earthquakeDashed circle: 100 km aftershock search areaColoured lines: estimated shaking intensity (USGS ShakeMap)
In context
How big was it, and why here?
Energy released
54 kilotons of TNT
That is about 4 times the Hiroshima bomb. It released about 114 times the energy of a magnitude 5.0.
Tectonic setting
56 km
from the nearest mapped plate boundary, between the Aegean Sea and African plates. Earthquakes cluster along boundaries like this one, where plates collide, pull apart or slide past each other.
Depth: shallow
20 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 100 km
USGS lists 2 M2.5+ earthquakes within 100 km in the following 30 days; the largest was M6.7 on August 13, 1922. Most nearby activity right after a large earthquake is aftershocks, which usually become less frequent over days and weeks.
Regional history
Past M5+ earthquakes within 300 km
USGS lists 22 M5.0+ earthquakes within 300 km before this one (catalog from 1900; older records are less complete). The strongest:
- 6.14 km SE of Megálo Chorió, GreeceAugust 11, 1904 · 271 km N of this epicenter
- 6.129 km ENE of Mesariá, GreeceApril 4, 1911 · 214 km NW of this epicenter
- 6.125 km NW of Kastrí, GreeceMay 17, 1908 · 298 km W of this epicenter
- 6.035 km S of Amorgós, GreeceOctober 25, 1919 · 205 km NW of this epicenter
- 5.98 km WSW of Mandráki, GreeceJuly 16, 1918 · 179 km N of this epicenter
- 5.825 km SSE of Kastrí, GreeceSeptember 30, 1913 · 272 km W of this epicenter
- 5.8174 km SE of Karpathos, GreeceSeptember 30, 1918 · 146 km SE of this epicenter
- 5.729 km SSE of Karpathos, GreeceMarch 17, 1918 · 33 km NE of this epicenter
History · NOAA
Deadliest earthquakes in this area
NOAA’s significant-earthquake database lists 13 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700, which together caused about 3,903 recorded deaths. The most severe:
- 1810
Crete: Iraklion (Candia)
16 Feb 1810 · 204 km away · intensity X
3,000 deathsSevere damage ($5–24M)tsunami
- 1856
Crete; Egypt
12 Oct 1856 · 120 km away · intensity XI
600 deathsSevere damage ($5–24M)tsunami
- 1863M7.8
Rhodes, Kos
22 Apr 1863 · 184 km away · intensity XI
300 deathsSevere damage ($5–24M)tsunami
- 1869M7.5
Gulf Of Keramos, Mentese
1 Dec 1869 · 236 km away · intensity X
3 deathsSevere damage ($5–24M)
- 1741M7.3
Dodecanese; Crete; Cyprus; Egypt
31 Jan 1741 · 181 km away · intensity VIII
Severe damage ($5–24M)tsunami
- 1815
Crete
Dec 1815 · 128 km away · intensity IX
Severe damage ($5–24M)
NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.