M4.2 Earthquake 37 km S of San Alejandro, Peru — September 14, 2025
2025-09-14 19:56:47 UTC (2025-09-14) · approx. 2:56 PM UTC-5 local
On September 14, 2025 at 19:56 UTC, a magnitude 4.2 intermediate depth earthquake struck 37 km S of San Alejandro, Peru, at a depth of 109.6 km and coordinates -9.1674°, -75.1848°.
Physical scale: An earthquake of magnitude 4.2 releases seismic energy equivalent to roughly 30 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 476 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-75.1848°E
Technical Information
Common Questions
How strong was the magnitude 4.2 earthquake near San Alejandro, Peru?
The magnitude 4.2 earthquake that struck 37 km S of San Alejandro, Peru on September 14, 2025 at 19:56 UTC had a depth of 109.6 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 4.2 earthquakes can continue for several days and gradually diminish over time.
What should I do after an earthquake?
If you were in the affected area: check yourself and others for injuries, inspect your home for damage, and be prepared for aftershocks. For detailed guidance, see our earthquake safety guide and emergency planning resources.
Actions
Location
Understanding This Data
Magnitude 4.2 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us6000rfeq). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2025, September 14, 2025). M4.2 Earthquake 37 km S of San Alejandro, Peru — September 14, 2025. Retrieved May 28, 2026 from https://www.earthquaketracker.org/earthquakes/event/us6000rfeq/