M4.8 Earthquake near southern East Pacific Rise — September 3, 2021
2021-09-03 05:40:10 UTC (2021-09-03) · approx. 9:40 PM UTC-8 local
Felt by 1 person across nearby locations. Aftershock of the M5.2 mainshock.
On September 3, 2021 at 05:40 UTC, a magnitude 4.8 shallow crustal earthquake struck near southern East Pacific Rise, at a depth of 10.0 km and coordinates -24.4598°, -116.0568°.
Physical scale: An earthquake of magnitude 4.8 releases seismic energy equivalent to roughly 239 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 1.2 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 5.2 mainshock that occurred 16 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.
Did You Feel It? — community-reported shaking
Aggregated felt-report intensity from 1 citizen response to the USGS Did You Feel It? system. Each colored zone represents the average MMI from reports in that area.
Source: U.S. Geological Survey Did You Feel It?. View on USGS · submit your own report
Earthquake Details
-116.0568°E
Technical Information
Common Questions
How strong was the magnitude 4.8 earthquake near southern East Pacific Rise?
The magnitude 4.8 earthquake that struck near southern East Pacific Rise on September 3, 2021 at 05:40 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 -24.4598°, -116.0568°, which is near southern East Pacific Rise.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.8 earthquakes can continue for several days and gradually diminish over time.
Is this the same earthquake as the M5.2 one earlier?
No. This magnitude 4.8 earthquake is an aftershock of the larger magnitude 5.2 mainshock that occurred earlier near southern East Pacific Rise. Aftershocks are smaller earthquakes triggered by stress changes from the mainshock.
Actions
Authoritative source: USGS event page (event ID: us7000f7cy). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, September 3, 2021). M4.8 Earthquake near southern East Pacific Rise — September 3, 2021. Retrieved November 17, 2021 from https://www.earthquaketracker.org/earthquakes/event/us7000f7cy/