M4.9 earthquake 20 km SE of Zakynthos, Ionian Islands, Greece
A magnitude 4.9 earthquake struck 20 km SE of Zakynthos, Ionian Islands, Greece at 07:15 local time (05:15 UTC) on 25 Oct 2026, at a depth of 10 km, according to USGS, GFZ and INGV.
Reported by 3 agencies · revised from M4.7 · 7 reports to USGS “Did You Feel It?”
Data: USGS, GFZ, INGV · updated 2026-11-07 11:47 UTC · reviewed
- Magnitude
- 4.9light
body-wave magnitude (mb)
revised from 4.7 - Depth
- 10 km
- Status
- Reviewed
- Origin time
- 2026-10-25 05:15:44 UTC
- Local: 25 Oct 2026, 07:15:44 (Europe/Athens)
- Epicentre
- 37.649° N, 21.059° E
Circles show this event and others within 36 km from 7 days before to 30 days after. Lines: plate boundaries and GEM active faults. Open on the live map
Nearby places
| Place | Distance | Est. shaking |
|---|---|---|
| ZakynthosIonian Islands, Greece · pop. 11,541 | 20 km | VModerate |
| VartholomióWest Greece, Greece · pop. 6,145 | 27 km | IVLight |
| PýrgosWest Greece, Greece · pop. 22,399 | 34 km | IVLight |
| PátraWest Greece, Greece · pop. 168,034 | 90 km | IIIWeak |
| AígioWest Greece, Greece · pop. 20,422 | 112 km | IIIWeak |
| AgrínioWest Greece, Greece · pop. 46,899 | 112 km | IIIWeak |
| AthensAttica, Greece · pop. 664,046 | 237 km | IIWeak |
| ThessaloníkiCentral Macedonia, Greece · pop. 317,778 | 370 km | INot felt |
Shaking is an estimate from the intensity prediction equation of Allen, Wald & Worden (2012), not an observation. Local ground and buildings can change it by a level or more. Likely felt out to about 114 km.
Every agency's solution
Agencies locate earthquakes with their own stations and methods, so their numbers differ. We match reports of the same event by time, distance and magnitude and show them side by side. The headline uses USGS, which has been reviewed by an analyst.
| Agency | Magnitude | Depth | Epicentre | Time offset | Status |
|---|---|---|---|---|---|
| GFZGFZ via GEOFON, GFZ Helmholtz Centre for Geosciences | 4.7 Mw | 10 km | 37.59° N, 20.93° E | +0.8 s | Automatic · 1 revision |
| USGSheadlineUSGS NEIC via U.S. Geological Survey | 4.9 mb | 10 km | 37.65° N, 21.06° E | – | Reviewed · 1 revision |
| INGVSURVEY-INGV-A via Istituto Nazionale di Geofisica e Vulcanologia | 4.9 mb | 14.6 km | 37.65° N, 21.12° E | +2.4 s | Automatic |
How big was it?
Widely felt near the epicentre: rattling windows and objects. Significant damage is unlikely.
It released roughly the energy of 338 t of TNT. Magnitude is logarithmic: each whole step means about 32 times more energy and 10 times larger waves on a seismogram. Depth matters too: at 10 km this was a shallow earthquake, which is felt more strongly at the surface than a deeper one of the same size.
M4.9 releases about 32× the energy of M3.9, and its waves are about 10× taller on a seismogram. Energy: 338 t of TNT vs 11 t of TNT.
Each square is the energy of one M3.9. Energy from log₁₀E = 1.5M + 4.8.
Aftershocks and nearby activity
No later earthquakes have been recorded within 36 km so far. 1 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.
Did you feel it?
Reports from people help show where shaking was strong. They are anonymous and shown here in aggregate.
Reports close 14 days after an earthquake.
Event id gfz2026uxav. First recorded here 25 Oct 2026, 05:22:35 UTC. Solutions: GFZ (geofon:gfz2026uxav); USGS (usgs:us6000u4sm); INGV (ingv:47627402). Cite as: SeismoAtlas, “M4.9 earthquake 20 km SE of Zakynthos, Ionian Islands, Greece”, https://seismoatlas.com/earthquake/gfz2026uxav-m4-9-earthquake-20-km-se-of-zakynthos-ionian-islands-greece, data from USGS, GFZ, INGV.
JSON: /api/v1/events/gfz2026uxav. SeismoAtlas is not an official warning service.