M4.7 Earthquake near western Indian-Antarctic Ridge — December 11, 2021
2021-12-11 16:48:07 UTC (2021-12-11) · approx. 1:48 AM UTC+9 local
On December 11, 2021 at 16:48 UTC, a magnitude 4.7 shallow crustal earthquake struck near western Indian-Antarctic Ridge, at a depth of 10.0 km and coordinates -50.1370°, 127.6198°.
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
127.6198°E
Technical Information
Common Questions
How strong was the magnitude 4.7 earthquake near western Indian-Antarctic Ridge?
The magnitude 4.7 earthquake that struck near western Indian-Antarctic Ridge on December 11, 2021 at 16:48 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 -50.1370°, 127.6198°, which is near western Indian-Antarctic Ridge.
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.
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Location
Authoritative source: USGS event page (event ID: us6000gbg6). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, December 11, 2021). M4.7 Earthquake near western Indian-Antarctic Ridge — December 11, 2021. Retrieved February 24, 2022 from https://www.earthquaketracker.org/earthquakes/event/us6000gbg6/