M4.7 Earthquake 25 km N of Arica, Chile — August 21, 2021
2021-08-21 22:07:50 UTC (2021-08-21) · approx. 5:07 PM UTC-5 local
Felt by 2 people across nearby locations.
On August 21, 2021 at 22:07 UTC, a magnitude 4.7 intermediate depth earthquake struck 25 km N of Arica, Chile, at a depth of 83.5 km and coordinates -18.2480°, -70.2872°.
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.
The epicenter is located in Chile, a region characterized by the Peru-Chile Trench, where the Nazca Plate subducts beneath South America at 65-80 mm per year. The nearest mapped fault system is the Peru-Chile Trench. View all earthquakes in Chile.
Learn more: Magnitude scale · Aftershock sequences
Did You Feel It? — community-reported shaking
Aggregated felt-report intensity from 2 citizen responses 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
-70.2872°E
Technical Information
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Common Questions
How strong was the magnitude 4.7 earthquake near Arica, Chile?
The magnitude 4.7 earthquake that struck 25 km N of Arica, Chile on August 21, 2021 at 22:07 UTC had a depth of 83.5 km. For context, this was a light earthquake commonly felt near the epicenter.
Where did the earthquake occur?
The earthquake epicenter was located at -18.2480°, -70.2872°, which is 25 km N of Arica, Chile. View all earthquakes in Chile.
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.
Has Chile had earthquakes this big before?
The largest recorded earthquake in Chile was the M9.5 Great Chilean earthquake of May 22, 1960. Today's magnitude 4.7 event is significantly smaller than that historical record.
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Location
Authoritative source: USGS event page (event ID: us6000f9ff). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, August 21, 2021). M4.7 Earthquake 25 km N of Arica, Chile — August 21, 2021. Retrieved November 2, 2021 from https://www.earthquaketracker.org/earthquakes/event/us6000f9ff/