M4.8 Earthquake near Kermadec Islands, New Zealand — August 11, 2022
2022-08-11 22:44:41 UTC (2022-08-11) · approx. 10:44 AM UTC-12 local
Aftershock of the M5.8 mainshock.
On August 11, 2022 at 22:44 UTC, a magnitude 4.8 shallow crustal earthquake struck near Kermadec Islands, New Zealand, at a depth of 32.8 km and coordinates -30.4982°, -177.6443°. The USGS PAGER system issued a green alert level for this event, indicating no significant casualties or damage expected. This earthquake was detected by 13 seismic stations with good location accuracy and was assigned a USGS significance rating of 354, placing it among routine seismic activity.
Physical scale: An earthquake of magnitude 4.8 releases seismic energy equivalent to roughly 239 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 1.2 km — 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 5.8 mainshock that occurred 10 days ago near Kermadec Islands, New Zealand. Since the mainshock, the USGS has recorded 0 aftershocks in this area. Aftershock activity is expected to continue for days to weeks as stresses on surrounding faults redistribute.
The epicenter is located in New Zealand, a region characterized by the Hikurangi subduction zone in the North Island and the Alpine Fault in the South Island. The nearest mapped fault system is the Alpine Fault. View all earthquakes in New Zealand.
Learn more: Magnitude scale · Aftershock sequences
ShakeMap — predicted shaking intensity
Modeled ground-motion intensity contoured on the Modified Mercalli scale (MMI). Computed by the USGS from the moment-tensor solution and regional ground-motion prediction equations.
Source: U.S. Geological Survey ShakeMap. View interactive ShakeMap on USGS
Earthquake Details
-177.6443°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 4.8 earthquake near Kermadec Islands, New Zealand?
The magnitude 4.8 earthquake that struck near Kermadec Islands, New Zealand on August 11, 2022 at 22:44 UTC had a depth of 32.8 km. For context, this was a light earthquake commonly felt near the epicenter.
Where did the earthquake occur?
The earthquake epicenter was located at -30.4982°, -177.6443°, which is near Kermadec Islands, New Zealand. View all earthquakes in New Zealand.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.8 earthquakes can continue for several days and gradually diminish over time.
Is this the same earthquake as the M5.8 one earlier?
No. This magnitude 4.8 earthquake is an aftershock of the larger magnitude 5.8 mainshock that occurred earlier near Kermadec Islands, New Zealand. Aftershocks are smaller earthquakes triggered by stress changes from the mainshock.
Has New Zealand had earthquakes this big before?
The largest recorded earthquake in New Zealand was the M8.2 Wairarapa earthquake of January 23, 1855. Today's magnitude 4.8 event is significantly smaller than that historical record.
Authoritative source: USGS event page (event ID: us6000ic5w). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2022, August 11, 2022). M4.8 Earthquake near Kermadec Islands, New Zealand — August 11, 2022. Retrieved October 21, 2022 from https://www.earthquaketracker.org/earthquakes/event/us6000ic5w/