M4.9 Earthquake southeast of the Loyalty Islands — October 31, 2021
2021-10-31 12:32:03 UTC (2021-10-31) · approx. 11:32 PM UTC+11 local
On October 31, 2021 at 12:32 UTC, a magnitude 4.9 intermediate depth earthquake struck southeast of the Loyalty Islands, at a depth of 121.1 km and coordinates -21.8434°, 170.8849°.
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
170.8849°E
Technical Information
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Common Questions
How strong was the magnitude 4.9 earthquake southeast of the Loyalty Islands?
The magnitude 4.9 earthquake that struck southeast of the Loyalty Islands on October 31, 2021 at 12:32 UTC had a depth of 121.1 km. For context, this was a light earthquake commonly felt near the epicenter.
Where did the earthquake occur?
The earthquake epicenter was located at -21.8434°, 170.8849°, which is southeast of the Loyalty Islands.
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: us7000fq9s). 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 southeast of the Loyalty Islands — October 31, 2021. Retrieved January 14, 2022 from https://www.earthquaketracker.org/earthquakes/event/us7000fq9s/