M4.7 Earthquake 77 km WNW of San Antonio de los Cobres, Argentina — November 26, 2023
2023-11-26 20:44:32 UTC (2023-11-26) · approx. 4:44 PM UTC-4 local
Aftershock of the M5.3 mainshock.
On November 26, 2023 at 20:44 UTC, a magnitude 4.7 intermediate depth earthquake struck 77 km WNW of San Antonio de los Cobres, Argentina, at a depth of 169.4 km and coordinates -23.9830°, -67.0408°. This earthquake was detected by 141 seismic stations with excellent location accuracy and was assigned a USGS significance rating of 340, placing it among routine seismic activity.
Physical scale: An earthquake of magnitude 4.7 releases seismic energy equivalent to roughly 169 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 1.1 km — a useful intuition for the size of the slip patch on the fault.
This earthquake is part of an ongoing aftershock sequence following the magnitude 5.3 mainshock that occurred 28 days ago 43 km NW of San Antonio de los Cobres, Argentina. Since the mainshock, the USGS has recorded 1 aftershocks in this area. Aftershock activity is expected to continue for days to weeks as stresses on surrounding faults redistribute.
Earthquake Details
-67.0408°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 4.7 earthquake near San Antonio de los Cobres, Argentina?
The magnitude 4.7 earthquake that struck 77 km WNW of San Antonio de los Cobres, Argentina on November 26, 2023 at 20:44 UTC had a depth of 169.4 km. For context, this was a light earthquake commonly felt near the epicenter.
Where did the earthquake occur?
The earthquake epicenter was located at -23.9830°, -67.0408°, which is 77 km WNW of San Antonio de los Cobres, Argentina.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.7 earthquakes can continue for several days and gradually diminish over time.
Is this the same earthquake as the M5.3 one earlier?
No. This magnitude 4.7 earthquake is an aftershock of the larger magnitude 5.3 mainshock that occurred earlier 43 km NW of San Antonio de los Cobres, Argentina. Aftershocks are smaller earthquakes triggered by stress changes from the mainshock.
Authoritative source: USGS event page (event ID: us6000lqx4). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, November 26, 2023). M4.7 Earthquake 77 km WNW of San Antonio de los Cobres, Argentina — November 26, 2023. Retrieved February 6, 2024 from https://www.earthquaketracker.org/earthquakes/event/us6000lqx4/