M4.7 Earthquake south of the Kermadec Islands — July 20, 2021
2021-07-20 14:41:26 UTC (2021-07-20) · approx. 2:41 AM UTC-12 local
On July 20, 2021 at 14:41 UTC, a magnitude 4.7 shallow crustal earthquake struck south of the Kermadec Islands, at a depth of 38.6 km and coordinates -33.0085°, -179.0381°.
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.
Earthquake Details
-179.0381°E
Technical Information
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Common Questions
How strong was the magnitude 4.7 earthquake south of the Kermadec Islands?
The magnitude 4.7 earthquake that struck south of the Kermadec Islands on July 20, 2021 at 14:41 UTC had a depth of 38.6 km. For context, this was a light earthquake commonly felt near the epicenter.
Where did the earthquake occur?
The earthquake epicenter was located at -33.0085°, -179.0381°, which is south of the Kermadec Islands.
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.
Actions
Authoritative source: USGS event page (event ID: us7000enqm). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, July 20, 2021). M4.7 Earthquake south of the Kermadec Islands — July 20, 2021. Retrieved September 25, 2021 from https://www.earthquaketracker.org/earthquakes/event/us7000enqm/