M4.7 Earthquake near northern East Pacific Rise — October 11, 2021
2021-10-11 20:23:49 UTC (2021-10-11) · approx. 1:23 PM UTC-7 local
On October 11, 2021 at 20:23 UTC, a magnitude 4.7 shallow crustal earthquake struck near northern East Pacific Rise, at a depth of 10.0 km and coordinates 10.0966°, -103.9716°.
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.
Earthquake Details
-103.9716°E
Technical Information
Common Questions
How strong was the magnitude 4.7 earthquake near northern East Pacific Rise?
The magnitude 4.7 earthquake that struck near northern East Pacific Rise on October 11, 2021 at 20:23 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 10.0966°, -103.9716°, which is near northern 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.
Actions
Authoritative source: USGS event page (event ID: us6000ftsu). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, October 11, 2021). M4.7 Earthquake near northern East Pacific Rise — October 11, 2021. Retrieved December 22, 2025 from https://www.earthquaketracker.org/earthquakes/event/us6000ftsu/