A very shallow magnitude 4.8 earthquake was reported early morning near Oia, Kykládes, South Aegean, Greece.According to the European-Mediterranean Seismological Centre (EMSC), the quake hit on Thursday, July 3rd, 2025, at 2:25 am local time at a very shallow depth of 8. km. Shallow earthquakes are felt more strongly than deeper ones as they are closer to the surface. The exact magnitude, epicenter, and depth of the quake might be revised within the next few hours or minutes as seismologists review data and refine their calculations, or as other agencies issue their report.Our monitoring service identified a second report from the German Research Centre for Geosciences (GFZ) which listed the quake at magnitude 4.3. Other agencies reporting the same quake include The Aristotle University of Thessaloniki Geophysical Lab. (AUTH) at magnitude 4.0, The Seismological Laboratory of the University of Athens (UOA) at magnitude 4.2, and the citizen-seismograph network of RaspberryShake at magnitude 4.1.Based on the preliminary seismic data, the quake was probably felt by many people in the area of the epicenter. It should not have caused significant damage, other than objects falling from shelves, broken windows, etc. In Arkesini (pop. 110) located 14 km from the epicenter, the quake should have been felt as light shaking.Weak shaking might have been felt in Fira (pop. 2,400) located 39 km from the epicenter, Oia (pop. 3,400) 40 km away, Messaria (pop. 1,200) 40 km away, Ios (pop. 2,000) 41 km away, Emporeio (pop. 1,900) 44 km away, Filotion (pop. 1,500) 48 km away, and Naxos (pop. 7,100) 58 km away.VolcanoDiscovery will automatically update magnitude and depth if these change and follow up if other significant news about the quake become available. If you’re in the area, please send us your experience through our reporting mechanism, either online or via our mobile app. This will help us provide more first-hand updates to anyone around the globe who wants to know more about this quake.Earthquake data: Date & time: Jul 3, 2025 02:25 am (GMT +3) local time (2 Jul 2025 23:25 GMT)Magnitude: 4.1Depth: 5.30 kmEpicenter latitude / longitude: 36.67°N / 25.75°E (Greece)Primary data source: NOA