M4.8 Earthquake 27 km S of San Martín, Argentina — March 18, 2023
2023-03-18 15:41:44 UTC (2023-03-18) · approx. 10:41 AM UTC-5 local
Felt by 3 people across nearby locations.
On March 18, 2023 at 15:41 UTC, a magnitude 4.8 shallow crustal earthquake struck 27 km S of San Martín, Argentina, at a depth of 37.4 km and coordinates -33.3296°, -68.4268°. This earthquake was detected by 38 seismic stations with excellent location accuracy and was assigned a USGS significance rating of 355, placing it among routine seismic activity.
Physical scale: An earthquake of magnitude 4.8 releases seismic energy equivalent to roughly 239 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 1.2 km — 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 3 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
-68.4268°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 4.8 earthquake near San Martín, Argentina?
The magnitude 4.8 earthquake that struck 27 km S of San Martín, Argentina on March 18, 2023 at 15:41 UTC had a depth of 37.4 km. For context, this was a light earthquake commonly felt near the epicenter.
Where did the earthquake occur?
The earthquake epicenter was located at -33.3296°, -68.4268°, which is 27 km S of San Martín, Argentina.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.8 earthquakes can continue for several days and gradually diminish over time.
Authoritative source: USGS event page (event ID: us7000jl36). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, March 18, 2023). M4.8 Earthquake 27 km S of San Martín, Argentina — March 18, 2023. Retrieved May 20, 2023 from https://www.earthquaketracker.org/earthquakes/event/us7000jl36/