M4.3 Earthquake near Kermadec Islands, New Zealand — July 24, 2021
2021-07-24 18:28:11 UTC (2021-07-24) · approx. 6:28 AM UTC-12 local
On July 24, 2021 at 18:28 UTC, a magnitude 4.3 shallow crustal earthquake struck near Kermadec Islands, New Zealand, at a depth of 10.0 km and coordinates -30.1490°, -177.5079°.
Physical scale: An earthquake of magnitude 4.3 releases seismic energy equivalent to roughly 43 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 558 m — 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 5.5 mainshock that occurred 26 days ago near Kermadec Islands, New Zealand. Since the mainshock, the USGS has recorded 2 aftershocks in this area. Aftershock activity is expected to continue for days to weeks as stresses on surrounding faults redistribute.
Earthquake Details
-177.5079°E
Technical Information
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Common Questions
How strong was the magnitude 4.3 earthquake near Kermadec Islands, New Zealand?
The magnitude 4.3 earthquake that struck near Kermadec Islands, New Zealand on July 24, 2021 at 18:28 UTC had a depth of 10.0 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 4.3 earthquakes can continue for several days and gradually diminish over time.
Is this the same earthquake as the M5.5 one earlier?
No. This magnitude 4.3 earthquake is an aftershock of the larger magnitude 5.5 mainshock that occurred earlier near Kermadec Islands, New Zealand. Aftershocks are smaller earthquakes triggered by stress changes from the mainshock.
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Understanding This Data
Magnitude 4.3 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us6000f0dm). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, July 24, 2021). M4.3 Earthquake near Kermadec Islands, New Zealand — July 24, 2021. Retrieved October 3, 2021 from https://www.earthquaketracker.org/earthquakes/event/us6000f0dm/