M4.5 Earthquake 120 km S of Port Blair, India — October 4, 2025
2025-10-04 20:31:03 UTC (2025-10-04) · approx. 2:31 AM UTC+6 local
On October 4, 2025 at 20:31 UTC, a magnitude 4.5 shallow crustal earthquake struck 120 km S of Port Blair, India, at a depth of 58.5 km and coordinates 10.5750°, 92.8178°. This earthquake was detected by 26 seismic stations with excellent location accuracy and was assigned a USGS significance rating of 312, placing it among routine seismic activity.
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.
Earthquake Details
92.8178°E
Technical Information
Common Questions
How strong was the magnitude 4.5 earthquake near Port Blair, India?
The magnitude 4.5 earthquake that struck 120 km S of Port Blair, India on October 4, 2025 at 20:31 UTC had a depth of 58.5 km. For context, this was a light earthquake commonly felt near the epicenter.
Where did the earthquake occur?
The earthquake epicenter was located at 10.5750°, 92.8178°, which is 120 km S of Port Blair, India.
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.
What should I do after an earthquake?
If you were in the affected area: check yourself and others for injuries, inspect your home for damage, and be prepared for aftershocks. For detailed guidance, see our earthquake safety guide and emergency planning resources.
Authoritative source: USGS event page (event ID: us6000rj7d). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2025, October 4, 2025). M4.5 Earthquake 120 km S of Port Blair, India — October 4, 2025. Retrieved May 27, 2026 from https://www.earthquaketracker.org/earthquakes/event/us6000rj7d/