M4.3 Earthquake 23 km NNE of San Martín, Argentina — May 31, 2026
2026-05-31 22:18:34 UTC (2026-05-31) · approx. 5:18 PM UTC-5 local
On May 31, 2026 at 22:18 UTC, a magnitude 4.3 intermediate depth earthquake struck 23 km NNE of San Martín, Argentina, at a depth of 114.5 km and coordinates -31.2313°, -68.4022°.
Physical scale: An earthquake of magnitude 4.3 releases seismic energy equivalent to roughly 43 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 558 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-68.4022°E
Technical Information
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Common Questions
How strong was the magnitude 4.3 earthquake near San Martín, Argentina?
The magnitude 4.3 earthquake that struck 23 km NNE of San Martín, Argentina on May 31, 2026 at 22:18 UTC had a depth of 114.5 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 4.3 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 4.3 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us7000spqp). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, May 31, 2026). M4.3 Earthquake 23 km NNE of San Martín, Argentina — May 31, 2026. Retrieved June 25, 2026 from https://www.earthquaketracker.org/earthquakes/event/us7000spqp/