The 1904 Samos earthquake struck Greece on August 11 with moment magnitude of 6.8 and a maximum Mercalli intensity of X (Extreme).

[2] Between the main shock and an aftershock that followed three days later, 540 houses were destroyed on Samos, then an autonomous part of the Ottoman Empire.

[3] Damage extended to Patmos and Anatolia, while shaking from the earthquake reached from offshore Chios and Santorini to Ödemiş and Aydın in Turkey.

[3] Along its source fault, the earthquake created 46 km (29 mi) of ruptured rock and had an average displacement of 1.2 m (3 ft 11 in).

[4] Within the last two centuries, Samos has experienced multiple powerful earthquakes registering above magnitude 6.0.