M4.9 Earthquake in the Kermadec Islands region — October 31, 2021
2021-10-31 00:48:34 UTC (2021-10-31) · approx. 12:48 PM UTC-12 local
On October 31, 2021 at 00:48 UTC, a magnitude 4.9 shallow crustal earthquake struck in the Kermadec Islands region, at a depth of 10.0 km and coordinates -29.2333°, -176.8065°.
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
-176.8065°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 4.9 earthquake in the Kermadec Islands region?
The magnitude 4.9 earthquake that struck in the Kermadec Islands region on October 31, 2021 at 00:48 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 -29.2333°, -176.8065°, which is in the Kermadec Islands region.
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.
Actions
Authoritative source: USGS event page (event ID: us7000fq73). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, October 31, 2021). M4.9 Earthquake in the Kermadec Islands region — October 31, 2021. Retrieved December 22, 2025 from https://www.earthquaketracker.org/earthquakes/event/us7000fq73/