Greece Earthquakes – Across the Aegean and Ionian Seas

No M1.5+ Greece earthquakes have been recorded in the past 24 hours.

Recent Earthquake Activity Around Greece

Monitor up-to-date earthquake activity in mainland Greece, the Greek islands, and the surrounding waters. One of Europe’s most seismically active countries. This interactive map displays all earthquakes of magnitude 1.5 and above. Choose the last hour, 24 hours, 7 days, or 30 days, then select a marker for the reported magnitude, location, UTC, and depth. Refreshing the page loads the latest available cached dataset.

greece earthquakes (map loads with JavaScript)

Regional coverage: This page uses geographical bounds and catalogue location descriptions to select Greek events. It is not a complete catalogue of the Aegean or eastern Mediterranean. Some border and offshore earthquakes, including events labelled as Turkey, may appear on neighbouring regional pages even when shaking is felt in Greece.

A Country Shaped by Subduction and Stretching

Greece sits in a complicated part of the Mediterranean where the crust is being compressed, stretched and displaced sideways. South of the country, African lithosphere descends beneath the Aegean region along the Hellenic subduction system. Farther north, much of the overriding crust is extending. Those processes produce different earthquake sources within a relatively small area.

The result is more varied than a single plate boundary drawn across a map. A shallow fault beneath a town, a rupture offshore near an island and an earthquake deep within the descending slab can all occur in Greece’s wider seismic setting. Their consequences depend on depth, distance, rupture characteristics and the vulnerability of buildings, as well as magnitude.

Greece also connects several wider earthquake regions. The northern Aegean links eastward with the fault systems of Turkey, while western Greece lies beside the Ionian Sea and the southern Balkans. The Europe earthquake map puts those connections into a broader geographical context.

The Hellenic Arc: Crete, Rhodes and the Sea to the South

The curved subduction system south of Greece is often called the Hellenic arc. Crete and Rhodes lie near its outer part, with the trench system farther offshore. Earthquakes occur both near the plate interface and within the descending plate, while faults in the upper plate add other sources of shallow shaking.

This distinction matters around Crete. An earthquake beneath or near the island is not automatically a rupture of the main subduction interface. The damaging 2021 Arkalochori earthquake, for example, was a shallow local event. Deeper offshore earthquakes belong to a different setting, even if their markers appear close together on a national map.

The arc also has a history of destructive tsunamis, but an offshore epicentre alone does not establish a tsunami threat. Magnitude, depth, the way the fault moves and whether the seabed is displaced all affect the outcome. Official tsunami information and local instructions provide the relevant assessment during an event.

Western Greece: More Than One Kind of Ionian Fault

Kefalonia, Lefkada and Zakynthos lie in a particularly active part of western Greece. Here, the transition between the Hellenic subduction system and the Adriatic region creates a complex arrangement of faults. Describing all Ionian earthquakes as thrust earthquakes misses an important part of the picture.

The Kefalonia–Lefkada transform fault zone accommodates substantial right-lateral motion: the blocks on opposite sides move sideways relative to one another. Compression and extension also occur within the broader region. Research on the evolution of the Kefalonia–Lefkada fault zone explains how different styles of deformation share the movement near this changing plate margin.

For island communities, shallow shaking is only part of the concern. Steep slopes, coastal cliffs, roads and older buildings may be vulnerable during strong earthquakes. The history of the Ionian islands therefore includes both the immediate effects of shaking and the practical challenge of restoring access and housing after a sequence.

The Gulf of Corinth Is an Active Rift

Between the Peloponnese and central Greece, the Gulf of Corinth marks a region where the crust is pulling apart. Normal faults accommodate that extension as blocks move downward relative to their neighbours. Many important structures lie along the gulf’s margins or continue beneath the water.

The gulf is a major natural laboratory for understanding continental rifting. The International Ocean Discovery Program’s Corinth expedition investigated its sedimentary record to study how the basin and its fault systems developed. That geological history helps explain why earthquakes recur in the region, without providing a timetable for the next damaging rupture.

The 1981 sequence demonstrated that the effects can extend well beyond the immediate epicentral area. Modern assessment must consider buildings, slopes and local ground conditions around the gulf, rather than treating distance from the nearest visible fault as a complete measure of safety.

Northern Aegean Faults and Mainland Cities

In the northern Aegean, strike-slip faulting forms part of the westward continuation of the deformation associated with the North Anatolian fault system. Other parts of northern and central Greece contain active normal faults. National borders and coastlines do not divide those geological systems into separate hazards.

Athens and Thessaloniki also sit within a country with a long record of damaging earthquakes. It is misleading to rank a city’s safety simply by comparing the magnitude of its most famous earthquake with another city’s. The distance to a rupture, the ground beneath a neighbourhood and the design and condition of its buildings can change the effects considerably.

The 1999 Athens disaster is an important example: a moderate-magnitude earthquake close to the metropolitan area caused severe losses. A smaller nearby event can be more damaging locally than a larger earthquake far offshore. Our guide to earthquake magnitude explains why magnitude and the intensity of shaking at a particular location are different measures.

Santorini, Kolumbo and the 2025 Seismic Crisis

The volcanic arc lies behind the outer Hellenic arc and includes Santorini and the nearby submarine volcano Kolumbo. Earthquakes here can involve regional faults, movement of magma and changes in pressure within the crust. Monitoring must therefore combine seismic observations with measurements of ground deformation and other volcanic indicators.

The 2025 Santorini–Amorgos crisis brought an intense offshore earthquake sequence and considerable disruption. Later analysis provided a more detailed explanation than the early debate over whether the activity was simply tectonic or volcanic. A 2025 study in Nature linked the crisis to a magma intrusion beneath the sea that also activated regional faults, using earthquake recordings and deformation measurements.

The study interpreted the intrusion as stopping below the seabed. Magma movement underground is not the same as an eruption at the surface, and an earthquake swarm alone does not demonstrate that an eruption is imminent. The episode remains important because it showed how volcanic and fault processes can interact, and why scientific interpretations develop as better observations become available.

Earthquakes That Changed Communities in Greece

These selected events illustrate different parts of Greece’s earthquake history. Historical magnitude estimates carry greater uncertainty than modern instrumental measurements, and agencies may report different magnitude types for the same event. This is a selection of consequential earthquakes and episodes, rather than a complete list of the country’s largest events.

365 CE – Crete and the eastern Mediterranean

A major earthquake and tsunami affected the eastern Mediterranean. Western Crete’s raised coast has often been associated with this event, but the earthquake source and the timing of all the uplift remain debated. Research reassessing the 365 CE earthquake cautions against treating every geological observation as evidence of one precisely known rupture.

1953 – The Ionian Islands

The August sequence devastated Kefalonia, Zakynthos and Ithaca. Greece’s Earthquake Planning and Protection Organization records the 12 August mainshock as M7.2, following damaging earlier shocks. The destruction and subsequent rebuilding remain central to the islands’ modern history. See OASP’s account of the 1953 earthquakes.

1956 – Amorgos and a destructive tsunami

The 9 July offshore earthquake generated a tsunami that struck islands in the southern Aegean. Its effects show why a nearby tsunami can matter even within an enclosed sea. INGV’s historical account documents the earthquake and the coastal impacts.

1981 – The Gulf of Corinth sequence

Strong earthquakes in February and March damaged communities across central Greece. OASP records an M6.7 event on 24 February and another damaging M6.4 event on 4 March. Surface ruptures and ground failures accompanied the sequence; OASP’s anniversary account describes the wider effects.

1999 – Athens and Parnitha

The 7 September earthquake caused severe destruction in parts of the Athens metropolitan area. OASP’s account gives its magnitude as 5.9 and records 143 deaths. Its consequences underline the importance of a shallow source close to vulnerable buildings.

2020 – Samos and the eastern Aegean

The 30 October Mw7.0 earthquake affected Samos and western Turkey, with destructive shaking and a tsunami on both sides of the Aegean. UNESCO’s report describes the rapid coastal impacts. The event is a reminder that an earthquake’s consequences can span more than one national map.

2021 – Arkalochori, Crete

The 27 September earthquake damaged buildings and displaced residents in central Crete. OASP records a magnitude of 5.8 and documents the damaging sequence, including a strong aftershock the next day. The event illustrates local shallow-fault hazard away from a simple picture of one offshore plate boundary.

2025 – Santorini–Amorgos unrest

A sustained offshore earthquake crisis prompted intensive investigation of the relationship between faults and the Santorini–Kolumbo volcanic system. It belongs in Greece’s recent seismic history as a major episode of unrest, rather than as a single mainshock or evidence that future swarms will follow the same course.

Coastal Greece and Tsunami Awareness

Greece’s islands and long coastline mean that earthquake preparedness sometimes needs a coastal component. The 1956 Amorgos and 2020 Samos events show that locally generated waves can reach nearby shores quickly. A tsunami is a series of waves, and the first arrival does not necessarily mark the end of the danger.

If strong or prolonged shaking occurs near the coast, or the sea suddenly withdraws or rises unusually, move away from the waterfront towards higher ground or inland and follow local evacuation guidance. Do not go to a beach or harbour to watch. Consult the Hellenic National Tsunami Warning Center for official tsunami information; a global earthquake listing is not a warning service.

Preparing at Home, on an Island or While Travelling

A practical plan should fit where you are staying. An apartment in Athens, an older village house and accommodation beside a harbour present different surroundings, but all benefit from clear exits, secured heavy furniture and an agreed way to contact others. Travellers should learn the local address and evacuation arrangements rather than relying only on a phone map.

• Before an earthquake: secure tall furniture and heavy objects, and keep shoes, a torch, essential medication and basic supplies accessible.
• During indoor shaking: take shelter beneath a sturdy table where possible, protect your head and neck, and stay away from windows. Avoid rushing to stairs or lifts.
• Outdoors: move clear of buildings, walls, overhead lines and other falling hazards where it is safe to do so.
• Afterwards: expect aftershocks, avoid damaged structures and follow instructions from emergency services. Leave coastal danger areas when natural warning signs or official advice require it.

Read the Greek Civil Protection earthquake instructions for national guidance. Our earthquake safety guide and preparedness checklist can help turn those steps into a household plan. For immediate danger in Greece, contact the emergency services through 112.

How Greek Earthquakes Are Monitored

The National Observatory of Athens operates the Hellenic Seismic Network. Its stations form part of a wider national monitoring effort alongside university and other institutional networks. Records from multiple stations allow specialists to estimate where an earthquake occurred and how large it was.

An automatic solution is useful quickly, but it is not always the final result. Analysts may revise an earthquake’s location, depth and magnitude as more signals are examined. A shallow offshore event can be especially difficult to locate precisely when the closest stations are on land. Differences between a national catalogue and a global feed do not automatically mean that either service has failed.

Seismic monitoring is complemented by other observations. Strong-motion instruments help measure the shaking relevant to structures; tide gauges support tsunami assessment; and volcanic areas require deformation and other specialist measurements. OASP and Civil Protection provide preparedness and public-protection information alongside the scientific work of the monitoring institutions.

Global catalogues do not include every small earthquake recorded by Greece’s local networks. For a more detailed national view, compare this page with the Institute of Geodynamics at the National Observatory of Athens. Initial locations, depths and magnitudes may change after analysts review additional recordings.

🗺️ Related Maps

Explore the Surrounding Earthquake Regions and continue with the Europe earthquake overview, or compare Greece with nearby regions whose faults form part of the same broader Mediterranean setting.

• Turkey earthquakes – the Anatolian fault systems and the eastern side of the Aegean.
• Balkans earthquakes – active faults across southeastern Europe.
• Italy earthquakes – the Apennines, southern Italy and neighbouring seas.
• Recent earthquakes worldwide – available global records beyond the Mediterranean.