M4.3 Earthquake 21 km NNE of San Martín, Argentina — August 7, 2021
2021-08-07 22:30:04 UTC (2021-08-07) · approx. 5:30 PM UTC-5 local
On August 7, 2021 at 22:30 UTC, a magnitude 4.3 intermediate depth earthquake struck 21 km NNE of San Martín, Argentina, at a depth of 108.9 km and coordinates -31.2504°, -68.4161°.0
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.
Did You Feel It? — community-reported shaking
Aggregated felt-report intensity from submitted citizen responses to the USGS Did You Feel It? system. Each colored zone represents the average MMI from reports in that area.
Source: U.S. Geological Survey Did You Feel It?. View on USGS · submit your own report
Earthquake Details
-68.4161°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 4.3 earthquake near San Martín, Argentina?
The magnitude 4.3 earthquake that struck 21 km NNE of San Martín, Argentina on August 7, 2021 at 22:30 UTC had a depth of 108.9 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: us6000f38v). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, August 7, 2021). M4.3 Earthquake 21 km NNE of San Martín, Argentina — August 7, 2021. Retrieved October 23, 2021 from https://www.earthquaketracker.org/earthquakes/event/us6000f38v/