M4.8 Earthquake 17 km NNE of Náfpaktos, Greece — July 8, 2023
2023-07-08 14:02:51 UTC (2023-07-08) · approx. 3:02 PM UTC+1 local
On July 8, 2023 at 14:02 UTC, a magnitude 4.8 shallow crustal earthquake struck 17 km NNE of Náfpaktos, Greece, at a depth of 10.0 km and coordinates 38.5479°, 21.8696°. This earthquake was detected by 56 seismic stations with good location accuracy and was assigned a USGS significance rating of 354, placing it among routine seismic activity.
Physical scale: An earthquake of magnitude 4.8 releases seismic energy equivalent to roughly 239 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 1.2 km — a useful intuition for the size of the slip patch on the fault.
The epicenter is located in Greece, a region characterized by the Hellenic subduction zone, where the African Plate subducts northward beneath the Aegean at roughly 35 mm per year. The nearest mapped fault system is the Hellenic Trench. View all earthquakes in Greece.
Learn more: Magnitude scale · Aftershock sequences
Earthquake Details
21.8696°E
Technical Information
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Common Questions
How strong was the magnitude 4.8 earthquake near Náfpaktos, Greece?
The magnitude 4.8 earthquake that struck 17 km NNE of Náfpaktos, Greece on July 8, 2023 at 14:02 UTC had a depth of 10.0 km. For context, this was a light earthquake commonly felt near the epicenter.
Where did the earthquake occur?
The earthquake epicenter was located at 38.5479°, 21.8696°, which is 17 km NNE of Náfpaktos, Greece. View all earthquakes in Greece.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.8 earthquakes can continue for several days and gradually diminish over time.
Has Greece had earthquakes this big before?
The largest recorded earthquake in Greece was the M8.5 Crete earthquake of June 29, 1303. Today's magnitude 4.8 event is significantly smaller than that historical record.
Authoritative source: USGS event page (event ID: us6000kqz4). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, July 8, 2023). M4.8 Earthquake 17 km NNE of Náfpaktos, Greece — July 8, 2023. Retrieved September 9, 2023 from https://www.earthquaketracker.org/earthquakes/event/us6000kqz4/