M4.5 Earthquake 241 km NE of Hicks Bay, New Zealand — April 6, 2023
2023-04-06 22:46:59 UTC (2023-04-06) · approx. 10:46 AM UTC+12 local
On April 6, 2023 at 22:46 UTC, a magnitude 4.5 shallow crustal earthquake struck 241 km NE of Hicks Bay, New Zealand, at a depth of 34.9 km and coordinates -35.9024°, 179.9898°. This earthquake was detected by 17 seismic stations with moderate location accuracy and was assigned a USGS significance rating of 312, placing it among routine seismic activity.
Physical scale: An earthquake of magnitude 4.5 releases seismic energy equivalent to roughly 85 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 767 m — a useful intuition for the size of the slip patch on the fault.
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
Earthquake Details
179.9898°E
Technical Information
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Common Questions
How strong was the magnitude 4.5 earthquake near Hicks Bay, New Zealand?
The magnitude 4.5 earthquake that struck 241 km NE of Hicks Bay, New Zealand on April 6, 2023 at 22:46 UTC had a depth of 34.9 km. For context, this was a light earthquake commonly felt near the epicenter.
Where did the earthquake occur?
The earthquake epicenter was located at -35.9024°, 179.9898°, which is 241 km NE of Hicks Bay, New Zealand. View all earthquakes in New Zealand.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.5 earthquakes can continue for several days and gradually diminish over time.
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 4.5 event is significantly smaller than that historical record.
Authoritative source: USGS event page (event ID: us6000k41n). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, April 6, 2023). M4.5 Earthquake 241 km NE of Hicks Bay, New Zealand — April 6, 2023. Retrieved January 18, 2024 from https://www.earthquaketracker.org/earthquakes/event/us6000k41n/