M4.3 Earthquake 178 km SE of Port Blair, India — April 21, 2021
2021-04-21 19:45:11 UTC (2021-04-21) · approx. 1:45 AM UTC+6 local
On April 21, 2021 at 19:45 UTC, a magnitude 4.3 shallow crustal earthquake struck 178 km SE of Port Blair, India, at a depth of 10.0 km and coordinates 10.4547°, 93.8204°.
Physical scale: An earthquake of magnitude 4.3 releases seismic energy equivalent to roughly 43 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 558 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
93.8204°E
Technical Information
Common Questions
How strong was the magnitude 4.3 earthquake near Port Blair, India?
The magnitude 4.3 earthquake that struck 178 km SE of Port Blair, India on April 21, 2021 at 19:45 UTC had a depth of 10.0 km. For context, this was a light earthquake commonly felt near the epicenter.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.3 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 4.3 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us7000dxx5). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, April 21, 2021). M4.3 Earthquake 178 km SE of Port Blair, India — April 21, 2021. Retrieved July 3, 2021 from https://www.earthquaketracker.org/earthquakes/event/us7000dxx5/