M4.0 Earthquake 18 km N of Simav, Turkey — April 21, 2025
2025-04-21 17:24:40 UTC (2025-04-21) · approx. 7:24 PM UTC+2 local
On April 21, 2025 at 17:24 UTC, a magnitude 4.0 shallow crustal earthquake struck 18 km N of Simav, Turkey, at a depth of 9.3 km and coordinates 39.2490°, 29.0164°.
Physical scale: An earthquake of magnitude 4.0 releases seismic energy equivalent to roughly 15 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 347 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
29.0164°E
Technical Information
Common Questions
How strong was the magnitude 4.0 earthquake near Simav, Turkey?
The magnitude 4.0 earthquake that struck 18 km N of Simav, Turkey on April 21, 2025 at 17:24 UTC had a depth of 9.3 km. For context, this was a light earthquake commonly felt near the epicenter.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.0 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 4.0 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us7000pu1f). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2025, April 21, 2025). M4.0 Earthquake 18 km N of Simav, Turkey — April 21, 2025. Retrieved June 27, 2025 from https://www.earthquaketracker.org/earthquakes/event/us7000pu1f/