M4.2 Earthquake 51 km NNE of Calama, Chile — September 29, 2025
2025-09-29 17:40:17 UTC (2025-09-29) · approx. 12:40 PM UTC-5 local
On September 29, 2025 at 17:40 UTC, a magnitude 4.2 intermediate depth earthquake struck 51 km NNE of Calama, Chile, at a depth of 108.2 km and coordinates -22.0099°, -68.7948°.
Physical scale: An earthquake of magnitude 4.2 releases seismic energy equivalent to roughly 30 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 476 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-68.7948°E
Technical Information
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Common Questions
How strong was the magnitude 4.2 earthquake near Calama, Chile?
The magnitude 4.2 earthquake that struck 51 km NNE of Calama, Chile on September 29, 2025 at 17:40 UTC had a depth of 108.2 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 4.2 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 4.2 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us6000rdma). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2025, September 29, 2025). M4.2 Earthquake 51 km NNE of Calama, Chile — September 29, 2025. Retrieved December 11, 2025 from https://www.earthquaketracker.org/earthquakes/event/us6000rdma/