Significant earthquakes of 1978

June 20, 1978 Earthquake: Thessaloniki, Greece

June 20, 1978 · M6.4 · 50 deaths · $250 million

A magnitude 6.4 earthquake struck Thessaloniki, Greece on June 20, 1978 at 20:03:21 UTC, 3 km below the surface. It killed 50 people.

Map

Where it struck, with the other significant earthquakes within 200 km. Circles are sized and colored by magnitude; select one for its page.

The earthquake

Date
June 20, 1978
Time
20:03:21 UTC
Place
Thessaloniki, Greece
Magnitude
6.4 (Ms)
Focal depth
3 km (2 mi)
Intensity
8 on the Modified Mercalli scale
Epicenter
40.739° N, 23.229° E
Country
Greece

The toll

Deaths
50
Injuries
Many (about 101 to 1,000)
Damage
$250 million

Where the literature gives no number, NCEI records a description on a scale of 1 to 4, printed here in its words. Damage is in millions of US dollars of the year of the event, not adjusted for inflation.

What the record says

NCEI’s account, from the sources it cites.

June 20, 1978, 20:03:21.0 UTC, 40.739 N, 23.229 E, depth 3 km, magnitude 6.1 mb, 6.4 MS. 50 persons killed, many injured and considerable damage in the Thessaloniki area, felt throughout Bulgaria, and in southern Yugoslavia. (reference #1053)

June 20, 1978. Salonica, Greece, 50 killed, $250 million damage. (reference #1250)

June 20, 1978. The earthquake, caused considerable damage, including the total collapse of an 8-story residential building; 50 lives were lost. In general, we find a large city [Thessaloniki] of 700,000 persons that has been shaken by a magnitude 6.5 earthquake, whose hypocenter is 20 to 30 km away and 22 km deep, to cause a peak recorded acceleration of about 0.159 and the total collapse of one tall (8-story) building from among thousands. Most of the deaths from the earthquake occurred in that one building. The tragedy would have been greater if many residents of the building had not been away on vacation on June 20. In the official report of losses resulting from the June 20 earthquakes, initial loss is estimated to be about $200 million (1978 U.S. dollars), and losses during the first few weeks after the earthquake are estimated to be about $10 million per day. It is not entirely clear whether losses in Thessaloniki Prefecture outside the city were included in these figures. (reference #3662)

Other significant earthquakes nearby

Within 200 km, the deadliest first.

More

Significant earthquakes of 1978The 1900sEvery quake the USGS located in 1978Recent earthquakes near hereThis day in weather history

Sources

Significant earthquakes from NOAA’s National Centers for Environmental Information, Global Historical Hazard Database, cited as NCEI/WDS, doi:10.7289/V5PN93H7. Public domain. Read 2026-09-24. NCEI earthquake 4808.