M4.9 Earthquake near Mid-Indian Ridge — May 20, 2021
2021-05-20 22:25:39 UTC (2021-05-20) · approx. 3:25 AM UTC+5 local
On May 20, 2021 at 22:25 UTC, a magnitude 4.9 shallow crustal earthquake struck near Mid-Indian Ridge, at a depth of 10.0 km and coordinates -33.4429°, 77.8786°.
Physical scale: An earthquake of magnitude 4.9 releases seismic energy equivalent to roughly 338 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 1.4 km — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
77.8786°E
Technical Information
Common Questions
How strong was the magnitude 4.9 earthquake near Mid-Indian Ridge?
The magnitude 4.9 earthquake that struck near Mid-Indian Ridge on May 20, 2021 at 22:25 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 -33.4429°, 77.8786°, which is near Mid-Indian Ridge.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.9 earthquakes can continue for several days and gradually diminish over time.
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Location
Authoritative source: USGS event page (event ID: us6000eeuk). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, May 20, 2021). M4.9 Earthquake near Mid-Indian Ridge — May 20, 2021. Retrieved December 22, 2025 from https://www.earthquaketracker.org/earthquakes/event/us6000eeuk/