An earthquake of magnitude 4.0 occurred in the evening on Monday, May 25th, 2026, at 9:50 pm local time near Pátrai, Achaea, West Greece, Greece, as reported by the European-Mediterranean Seismological Centre (EMSC).According to preliminary data, the quake was located at a very shallow depth of 5. 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.A second report was later issued by the German Research Centre for Geosciences (GFZ), which listed it as a magnitude 4.2 earthquake. Other agencies reporting the same quake include The Seismological Survey of Serbia (SSS) at magnitude 4.0, the citizen-seismograph network of RaspberryShake at magnitude 4.2, the National Observatory of Athens (NOA) at magnitude 3.9, The Aristotle University of Thessaloniki Geophysical Lab. (AUTH) at magnitude 3.9, and The Seismological Laboratory of the University of Athens (UOA) at magnitude 3.9.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 Agios Dimitrios (pop. 230) located 5 km from the epicenter, the quake should have been felt as light shaking.Weak shaking might have been felt in Andravida (pop. 3,600) located 13 km from the epicenter, Lechaina (pop. 3,700) 14 km away, Amaliada (pop. 16,800) 14 km away, Gastouni (pop. 8,100) 16 km away, and Pyrgos (pop. 22,400) 26 km away.Other towns or cities near the epicenter where the quake might have been felt as very weak shaking include Pátrai (pop. 168,000) located 46 km from the epicenter, Aigio (pop. 20,400) 69 km away, and Agrinio (pop. 46,900) 79 km away.Earthquake data: Date & time: May 25, 2026 09:50 pm (Athens time) local time (25 May 2026 18:50 GMT)Magnitude: 4.0Depth: 5.00 kmEpicenter latitude / longitude: 37.91°N / 21.42°E (Dimos Ilida (Dimos Ilidas), West Greece, Greece)Primary data source: EMSC