M4.6 Earthquake Hits Greece — What We Know

Seismologists have recorded a magnitude 4.6 earthquake in Greece, with the epicentre located 1 km NNW of Katochí, Greece. The event occurred at 07:46 UTC on Tuesday, September 8, 2026 and originated at a depth of 10.0 km.

Seismic Context for Greece

Greece and the broader Aegean region are among the most seismically active areas in Europe, positioned along the Hellenic Arc where the African Plate subducts beneath the Eurasian Plate.

Greece accounts for approximately 50% of all seismic energy released in Europe. The Ionian Islands, Crete, and the North Aegean are historically the most active zones, though significant earthquakes can and do occur across the entire country.

About This Event

At a focal depth of 10.0 km, this is classified as a shallow earthquake (0–70 km). Shallow events are typically the most damaging: the seismic energy has less distance to travel before reaching the surface, resulting in stronger and more abrupt ground shaking at the epicentre.

In terms of felt effects, a magnitude 4.6 earthquake is typically felt strongly by everyone; minor to moderate damage possible in vulnerable buildings. Moderate earthquakes are felt by virtually everyone near the epicentre. Strong shaking lasting 10–30 seconds can topple unsecured items, crack plaster, and cause poorly anchored objects to fall. Aftershocks are common following moderate events.

Understanding the Magnitude Scale

Earthquake magnitude is measured on a logarithmic scale — meaning each whole-number increase corresponds to roughly 32 times more energy released and approximately 10 times greater ground motion amplitude. A magnitude 4.6 event therefore releases significantly more energy than its number alone might suggest to the casual observer.

A magnitude 4.6 earthquake releases approximately roughly 500 tonnes of TNT of energy. For comparison, this exceeds the energy released by most conventional explosive events and is sufficient to shift tectonic stress in measurable ways across a wide region.

Significant damage can occur to vulnerable structures — particularly unreinforced masonry, old adobe buildings, and poorly maintained older construction. Well-engineered modern buildings are designed to withstand this level of shaking with minimal structural impact, though contents may shift and non-structural elements (ceilings, partitions) can be damaged.

What to Do After an Earthquake

If you are on or near a coast and experience strong or prolonged earthquake shaking, treat it as a potential tsunami warning and move immediately to high ground. Do not wait for an official alert — natural warning signs (severe shaking, unusual sea withdrawal) are your first alert.

Fasten heavy furniture — bookshelves, water heaters, cabinets — to walls using earthquake straps. Store breakable items on lower shelves and heavy items closest to the floor. These simple steps significantly reduce the risk of injury from falling objects.

Staying Informed

The Greek Earthquake Planning and Protection Organisation (OASP/EPPO) provides guidance and resources for residents. Standard Drop, Cover, Hold On procedures apply, and coastal residents should move inland immediately after strong shaking.

QuakeWatch publishes real-time earthquake data sourced from the USGS global catalog — covering every detected seismic event worldwide, 24 hours a day. Visit our live map to see this and all other recent earthquakes, or explore our guide to earthquake magnitude for a deeper understanding of what these numbers mean in practice.

Community Felt Reports

If you felt this earthquake, your experience contributes to an important scientific dataset. The USGS "Did You Feel It?" (DYFI) system and QuakeWatch's own community reports platform collect first-hand accounts of shaking intensity from people across the affected region. These reports — describing where people were, what they felt, and what moved or was damaged — help seismologists map shaking intensity across an area much larger than any single seismograph can cover. Visit the earthquake's detail page on our live map to submit your own report.