November 368 Earthquake: Marmara Sea, Turkey
A magnitude 6.4 earthquake struck Marmara Sea, Turkey in November 368. It caused a tsunami.
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
- November 368
- Place
- Marmara Sea, Turkey
- Magnitude
- 6.4 (Ms)
- Intensity
- 8 on the Modified Mercalli scale
- Tsunami
- Yes: the tsunami it caused
- Epicenter
- 40.500° N, 29.600° E
- Country
- Turkey
The toll
- Damage
- Moderate (about $1 to $5 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.
368, 40o48'N, 29o12'E, earthquake magnitude 6.4, intensity VIII. Sea wave in Bithynia. (reference #2427)
368 ...somewhat later [after October 11, 368] another earthquake caused destruction in Hellespontus. (reference #1149)
368, after October 11. Earthquake in The Hellespont. (reference #521)
368 Nov. The greater part of Germa in the Hellespont was destroyed by an earthquake. This was most probably a large aftershock of the earthquake in October, confirming that the centre of activity in 368 was between Nicaea and Germa. (reference #14000)
368 Nov (?), Germe. The greater part of Germe in Mysia was destroyed by an earthquake. Nothing else is known about this event. Socrates Scholasticus says that shortly after the Nicaea earthquake of 11 October 368, the greater part of Germe was destroyed by another earthquake. Socrates is the only near-contemporary source, but Georgios Monachos also alludes to this event, which he wrongly associates with the AD 365 earthquake (reference #9116)
Other significant earthquakes nearby
Within 200 km, the deadliest first.
- August 17, 1999, Istanbul, Kocaeli, Sakarya, Turkey
- May 25, 1719, Turkey
- September 10, 1509, Istanbul, Turkey
- May 22, 1766, Turkey
- February 28, 1855, Tayabas, Bursa, Turkey
- September 2, 1754, Izmit, Turkey
- July 10, 1894, Turkey
- April 29, 1855, Bursa, Turkey
- March 28, 1970, Gediz, Turkey
- March 18, 1953, Yenice, Onon, Turkey
- October 11, 367, Iznik,nicaea, Turkey
- November 12, 1999, Bolu-Duzce-Kaynasli, Adapazari, Zonguldak, Turkey
- May 12, 1866, Goynuk, Turkey
- April 11, 1855, Bursa, Turkey
- June 20, 1943, Hendek, Adapazari, Turkey
More
Significant earthquakes of 368The 300sRecent earthquakes near here
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 8239.