Magnitude 4.1 earthquake strikes Achaea in western Greece at depth of 5 kilometres

Magnitude and detection parameters

A magnitude 4.1 earthquake occurred in the regional unit of Achaea in western Greece on Friday, 2 October 2026. Automated seismic monitoring stations registered the event during the late afternoon, with time measurements recorded at 18:25 and 18:26 local time. The Geodynamic Institute of the National Observatory of Athens released an automated solution calculating the tremor at 4.1 on the Richter scale. An early report published by SKAI listed the magnitude at 4.0 before comprehensive readings settled at 4.1. The European-Mediterranean Seismological Centre also reported a magnitude measurement of 4.1 on the Richter scale. Seismologists from the Geodynamic Institute determined that the earthquake had a focal depth of 5.0 kilometres beneath the surface.

Epicentre coordinates and distances

Seismological institutions documented the epicentre location using distinct regional reference points across western Greece. The Geodynamic Institute of the National Observatory of Athens placed the epicentre 3 kilometres northwest of Chalandritsa. Chalandritsa is a settlement located within the Municipality of Erymanthos in Achaea. The European-Mediterranean Seismological Centre calculated the epicentre location at 13 kilometres south-southeast of Patras. Both institutes identified the event as an inland tremor occurring within the administrative borders of the prefecture of Achaea. The combination of an epicentre near Chalandritsa and a shallow depth of 5.0 kilometres allowed vibrations to travel directly into nearby population centres.

Felt reports across Achaea and Kalavryta

The earthquake produced ground vibrations that were felt across multiple areas of Achaea and the northern Peloponnese. In Patras, the regional urban hub situated north of the epicentre, residents reported feeling noticeable shaking in multi-storey buildings and private residences. Shaking was also documented in the mountainous community of Kalavryta, located to the southeast. Regional Greek media reported that the tremor was felt across numerous rural districts and surrounding settlements in the prefecture. The Geodynamic Institute observed that the shallow focal depth of 5 kilometres was the primary factor that caused the tremor to be felt strongly across the wider region.

Assessment of structural damage and injuries

Municipal services and civil authorities conducted immediate reviews across the affected areas following the earthquake. Official reports confirmed that no injuries or casualties occurred among citizens in Chalandritsa, Patras, Kalavryta, or neighbouring villages. Authorities likewise verified that the tremor caused no structural damage to residential housing, commercial buildings, or regional infrastructure. Emergency responders in the Municipality of Erymanthos received no emergency calls requesting rescue assistance or structural inspections. The Geodynamic Institute of the National Observatory of Athens and the European-Mediterranean Seismological Centre continued automated seismic tracking across western Greece following the event.