M4.5 Earthquake 66 km SSW of Kastrí, Greece — July 8, 2023
2023-07-08 19:29:32 UTC (2023-07-08) · approx. 9:29 PM UTC+2 local
On July 8, 2023 at 19:29 UTC, a magnitude 4.5 shallow crustal earthquake struck 66 km SSW of Kastrí, Greece, at a depth of 44.7 km and coordinates 34.2882°, 23.7772°. This earthquake was detected by 41 seismic stations with excellent location accuracy and was assigned a USGS significance rating of 312, placing it among routine seismic activity.
Physical scale: An earthquake of magnitude 4.5 releases seismic energy equivalent to roughly 85 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 767 m — 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
23.7772°E
Technical Information
Common Questions
How strong was the magnitude 4.5 earthquake near Kastrí, Greece?
The magnitude 4.5 earthquake that struck 66 km SSW of Kastrí, Greece on July 8, 2023 at 19:29 UTC had a depth of 44.7 km. For context, this was a light earthquake commonly felt near the epicenter.
Where did the earthquake occur?
The earthquake epicenter was located at 34.2882°, 23.7772°, which is 66 km SSW of Kastrí, Greece. View all earthquakes in Greece.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.5 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 4.5 event is significantly smaller than that historical record.
Authoritative source: USGS event page (event ID: us6000kr09). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, July 8, 2023). M4.5 Earthquake 66 km SSW of Kastrí, Greece — July 8, 2023. Retrieved September 9, 2023 from https://www.earthquaketracker.org/earthquakes/event/us6000kr09/