M4.7 Earthquake in the Nicobar Islands, India region — November 9, 2022
2022-11-09 20:59:12 UTC (2022-11-09) · approx. 2:59 AM UTC+6 local
Aftershock of the M5.0 mainshock.
On November 9, 2022 at 20:59 UTC, a magnitude 4.7 shallow crustal earthquake struck in the Nicobar Islands, India region, at a depth of 9.3 km and coordinates 7.3617°, 94.2277°. This earthquake was detected by 73 seismic stations with excellent location accuracy and was assigned a USGS significance rating of 340, placing it among routine seismic activity.
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.
This earthquake is part of an ongoing aftershock sequence following the magnitude 5.0 mainshock that occurred 28 days ago 180 km NW of Sabang, Indonesia. Since the mainshock, the USGS has recorded 0 aftershocks in this area. Aftershock activity is expected to continue for days to weeks as stresses on surrounding faults redistribute.
Earthquake Details
94.2277°E
Technical Information
Common Questions
How strong was the magnitude 4.7 earthquake in the Nicobar Islands, India region?
The magnitude 4.7 earthquake that struck in the Nicobar Islands, India region on November 9, 2022 at 20:59 UTC had a depth of 9.3 km. For context, this was a light earthquake commonly felt near the epicenter.
Where did the earthquake occur?
The earthquake epicenter was located at 7.3617°, 94.2277°, which is in the Nicobar Islands, India region.
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.
Is this the same earthquake as the M5.0 one earlier?
No. This magnitude 4.7 earthquake is an aftershock of the larger magnitude 5.0 mainshock that occurred earlier 180 km NW of Sabang, Indonesia. Aftershocks are smaller earthquakes triggered by stress changes from the mainshock.
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Location
Authoritative source: USGS event page (event ID: us7000inn2). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2022, November 9, 2022). M4.7 Earthquake in the Nicobar Islands, India region — November 9, 2022. Retrieved January 21, 2023 from https://www.earthquaketracker.org/earthquakes/event/us7000inn2/