M4.5 Earthquake in the Falkland Islands region — September 23, 2021
2021-09-23 20:47:34 UTC (2021-09-23) · approx. 4:47 PM UTC-4 local
Felt by 1 person across nearby locations.
On September 23, 2021 at 20:47 UTC, a magnitude 4.5 shallow crustal earthquake struck in the Falkland Islands region, at a depth of 10.0 km and coordinates -54.4209°, -56.9881°.
Physical scale: An earthquake of magnitude 4.5 releases seismic energy equivalent to roughly 85 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 767 m — a useful intuition for the size of the slip patch on the fault.
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
-56.9881°E
Technical Information
Common Questions
How strong was the magnitude 4.5 earthquake in the Falkland Islands region?
The magnitude 4.5 earthquake that struck in the Falkland Islands region on September 23, 2021 at 20:47 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 -54.4209°, -56.9881°, which is in the Falkland Islands region.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.5 earthquakes can continue for several days and gradually diminish over time.
Actions
Authoritative source: USGS event page (event ID: us7000ff7z). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, September 23, 2021). M4.5 Earthquake in the Falkland Islands region — September 23, 2021. Retrieved December 3, 2021 from https://www.earthquaketracker.org/earthquakes/event/us7000ff7z/