# Seismic activity in Greek waters

> Live situation record from CLSTR: https://clstr.news/situations/seismic-activity-in-greek-waters
> Updated: 2026-10-17T00:16:00.000Z. Sources: 6. Developments: 2.

In early October 2026, a series of earthquakes struck the maritime area between the Greek islands of Kasos and Crete. The Geodynamic Institute recorded an initial 4.1 magnitude tremor at 02:43, followed by a 3.9 magnitude earthquake at 02:50 and a third tremor of 3.3 magnitude at 03:18.

On October 17, 2026, another earthquake occurred in the Ionian Sea near Cephalonia. The tremor, measuring 4.2 magnitude, was recorded at 02:57. While the Geodynamic Institute of the National Observatory of Athens placed the epicenter 4 kilometers east-northeast of Sami, the Euro-Mediterranean Seismological Centre reported it 11 kilometers south of Ithaca. No material damage was reported following this event.

## Timeline

### 2026-10-17: Earthquake hits Ionian Sea near Cephalonia

A 4.2 magnitude earthquake struck the Ionian Sea near Cephalonia and Ithaca in the early hours of Saturday. No damage has been reported.

2 sources. https://clstr.news/cluster/earthquake-hits-ionian-sea-near-cephalonia

### 2026-10-07: Earthquakes strike maritime area between Kasos and Crete

A series of earthquakes, including tremors of 4.1 and 3.9 magnitude, occurred in the sea between Kasos and Crete in the early hours of Wednesday.

4 sources. https://clstr.news/cluster/earthquakes-strike-maritime-area-between-kasos-and-crete

---
Cite as: Seismic activity in Greek waters. CLSTR, https://clstr.news/situations/seismic-activity-in-greek-waters