M3.4 earthquake 4 km SSW of Sochós, Greece

Sunday, July 9, 1978, 04:01:59 UTC · 40.783°N, 23.335°E

A magnitude 3.4 earthquake struck 4 km SSW of Sochós, Greece on Sunday, July 9, 1978, 04:01:59 UTC, at a depth of 10.0 km (shallow).

Magnitude: 3.4; Minor · ml
Depth: 10 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

2 tons of TNT

That is about 1/7,931 of the Hiroshima bomb. A magnitude 5.0 releases about 251 times more energy.

Tectonic setting

111 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

10 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 8 M2.5+ earthquakes within 50 km in the following 30 days; the largest was M3.9 on July 13, 1978. Most nearby activity right after a large earthquake is aftershocks, which usually become less frequent over days and weeks.

Time after the mainshock on a logarithmic scale (first hours stretched), magnitude on the vertical axis. M2.5+ events from USGS.

Regional history

Past M5+ earthquakes within 300 km

USGS lists 276 M5.0+ earthquakes within 300 km before this one (catalog from 1900; older records are less complete). The strongest:

History · NOAA

Deadliest earthquakes in this area

NOAA’s significant-earthquake database lists 90 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700, which together caused about 2,724 recorded deaths. The most severe:

1963M6.0
Macedonia: Skopje
26 Jul 1963 · 224 km away · intensity X
1,070 deaths$1.0 billion damage
1894M6.7
Locride, Malesina-Martinon (Lokris)
20 Apr 1894 · 243 km away · intensity X
255 deathsSevere damage ($5–24M)
1920M6.2
Tepelene, Dragoti, Peshtani, Maricaj
26 Nov 1920 · 289 km away · intensity XI
200 deathsSevere damage ($5–24M)
1932M6.9
Hierissos-Strantonion (Chalkidiki)
26 Sep 1932 · 57 km away · intensity X
161 deathsExtreme damage ($25M+)tsunami
1817M6.6
Achaia: Aeghion
23 Aug 1817 · 297 km away · intensity X
128 deathsSevere damage ($5–24M)tsunami
1928M6.8
Chirpan
14 Apr 1928 · 227 km away · intensity X
127 deathsExtreme damage ($25M+)

NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.

Nearby trackers