M4.3 Earthquake 19 km NNE of Fiambalá, Argentina — July 21, 2026
2026-07-21 14:55:25 UTC (7 hours ago) · approx. 9:55 AM UTC-5 local
On July 21, 2026 at 14:55 UTC, a magnitude 4.3 intermediate depth earthquake struck 19 km NNE of Fiambalá, Argentina, at a depth of 172.8 km and coordinates -27.5175°, -67.5165°.
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
-67.5165°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 4.3 earthquake near Fiambalá, Argentina?
The magnitude 4.3 earthquake that struck 19 km NNE of Fiambalá, Argentina on July 21, 2026 at 14:55 UTC had a depth of 172.8 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.
Actions
Understanding This Data
Magnitude 4.3 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us7000t26m). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, July 21, 2026). M4.3 Earthquake 19 km NNE of Fiambalá, Argentina — July 21, 2026. Retrieved July 21, 2026 from https://www.earthquaketracker.org/earthquakes/event/us7000t26m/