543 Earthquake: Cyzicus (Erdek), Turkey
A magnitude 6.8 earthquake struck Cyzicus (Erdek), Turkey in 543. 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
- 543
- Place
- Cyzicus (Erdek), Turkey
- Magnitude
- 6.8 (Ms)
- Intensity
- 10 on the Modified Mercalli scale
- Tsunami
- Yes: the tsunami it caused
- Epicenter
- 40.400° N, 27.800° E
- Country
- Turkey
The toll
- Deaths
- Many (about 101 to 1,000) with its tsunami and other effects
- Damage
- Severe (about $5 to $25 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.
In AD 544 an earthquake-induced destructive inundation hit the coast of Thrace facing the North Aegean Sea. However, its origin remains questionable since strangely enough it was reported that it inundated also the Bulgarian coast of the Black Sea (Papadopoulos et al., 2011, and references therein).
From Byzantine historical sources, it appears that a strong sea wave, very likely a tsunami, that hit coastal settlements of Bulgaria, was caused by a very strong earthquake occurring on AD 544 or 545 offshore modern Varna (Figure 2.2). Ranguelov et al. (2008a) presented field evidence from an archeological site in Balchik city, situated ∼20 km north of Varna. Namely, the Cybele Temple was affected by fire and roof collapse, very possibly due to that earthquake. The floor was flooded by seawater, which left behind a layer of sand and shells. The Temple is of the Hellenistic period and located about 180 m inland from the present shoreline (Figure 2.14).
(above from reference #11868)
Many sources report a strong earthquake affecting the town of Cyzicus (Asia Minor), destroying the city. The date of occuurence is uncertain: some authors date the event in 542 B.C. (Ambraseys, r391), some others in 543 B.C.or in 544/545 (Guidoboni, r379, r572). According to Giudoboni, the description of anomalous sea behaviour in Thrace is dated in 544/545 B.C. (reference #4139)
542 (possibly 543, September 6), winter. Region of the Sea of Marmara. An earthquake. Cyzicus was destroyed. In some places, the shore of Thrace was flooded for 3 - 4 km including Odessus, (i = 4). The sea returned to its normal state after many people were killed and much damage done. Waves were observed in Dionysioupolis, Aphrodesion, in the Gulf of Edremit, in Asia Minor where many towns were flooded. There exists no reliable information on the preceding earthquake, but the values of its parameters are available: 40.3 N, 27.8 E, M = 6.8. (reference #2130)
Many sources report a strong earthquake affecting the town of Cyzicus (Asia Minor), destroying the city.
The date of occurrence is uncertain: some authors date the event in 542 B.C. (Ambraseys, 1962.), some
others in 543 B.C.or in 544/545 (Guidoboni, 1989, Guidoboni et al., 1994). According to Guidoboni, the
description of anomalous sea behaviour in Thrace is dated in 544/545 B.C. (reference #11164)
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
- August 9, 1912, Marmara Sea, Turkey
- February 28, 1855, Tayabas, Bursa, Turkey
- September 2, 1754, Izmit, Turkey
- July 10, 1894, Turkey
- April 29, 1855, Bursa, Turkey
- March 18, 1953, Yenice, Onon, Turkey
- October 11, 367, Iznik,nicaea, Turkey
- March 7, 1867, Izmir, Mitilini, Turkey, Greece
- August 6, 1384, Lesbos, Greece
- April 11, 1855, Bursa, Turkey
- September 21, 1939, Turkey
More
Significant earthquakes of 543The 500sRecent 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 5889.