M4.7 Earthquake near southern East Pacific Rise — September 24, 2025
2025-09-24 09:19:54 UTC (2025-09-24) · approx. 1:19 AM UTC-8 local
Aftershock of the M5.0 mainshock.
On September 24, 2025 at 09:19 UTC, a magnitude 4.7 shallow crustal earthquake struck near southern East Pacific Rise, at a depth of 10.0 km and coordinates -54.5726°, -118.9566°. This earthquake was detected by 36 seismic stations with good 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 5.0 mainshock that occurred 7 days ago near southern East Pacific Rise. Since the mainshock, the USGS has recorded 0 aftershocks in this area. Aftershock activity is expected to continue for days to weeks as stresses on surrounding faults redistribute.
Earthquake Details
-118.9566°E
Technical Information
Common Questions
How strong was the magnitude 4.7 earthquake near southern East Pacific Rise?
The magnitude 4.7 earthquake that struck near southern East Pacific Rise on September 24, 2025 at 09:19 UTC had a depth of 10.0 km. For context, this was a light earthquake commonly felt near the epicenter.
Where did the earthquake occur?
The earthquake epicenter was located at -54.5726°, -118.9566°, which is near southern East Pacific Rise.
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 M5.0 one earlier?
No. This magnitude 4.7 earthquake is an aftershock of the larger magnitude 5.0 mainshock that occurred earlier near southern East Pacific Rise. Aftershocks are smaller earthquakes triggered by stress changes from the mainshock.
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.
Authoritative source: USGS event page (event ID: us6000rhky). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2025, September 24, 2025). M4.7 Earthquake near southern East Pacific Rise — September 24, 2025. Retrieved May 28, 2026 from https://www.earthquaketracker.org/earthquakes/event/us6000rhky/