M4.1 Earthquake 106 km W of Riverton, New Zealand — August 22, 2021
2021-08-22 22:46:22 UTC (2021-08-22) · approx. 9:46 AM UTC+11 local
On August 22, 2021 at 22:46 UTC, a magnitude 4.1 intermediate depth earthquake struck 106 km W of Riverton, New Zealand, at a depth of 123.1 km and coordinates -46.2696°, 166.6387°.
Physical scale: An earthquake of magnitude 4.1 releases seismic energy equivalent to roughly 21 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 406 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
166.6387°E
Technical Information
Common Questions
How strong was the magnitude 4.1 earthquake near Riverton, New Zealand?
The magnitude 4.1 earthquake that struck 106 km W of Riverton, New Zealand on August 22, 2021 at 22:46 UTC had a depth of 123.1 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 4.1 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 4.1 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us6000f9v2). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, August 22, 2021). M4.1 Earthquake 106 km W of Riverton, New Zealand — August 22, 2021. Retrieved November 2, 2021 from https://www.earthquaketracker.org/earthquakes/event/us6000f9v2/