M4.5 Earthquake 133 km SSE of Alo, Wallis and Futuna — June 21, 2023
2023-06-21 23:57:02 UTC (2023-06-21) · approx. 11:57 AM UTC-12 local
On June 21, 2023 at 23:57 UTC, a magnitude 4.5 shallow crustal earthquake struck 133 km SSE of Alo, Wallis and Futuna, at a depth of 9.5 km and coordinates -15.3390°, -177.4629°. This earthquake was detected by 10 seismic stations with good 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.
Earthquake Details
-177.4629°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 4.5 earthquake near Alo, Wallis and Futuna?
The magnitude 4.5 earthquake that struck 133 km SSE of Alo, Wallis and Futuna on June 21, 2023 at 23:57 UTC had a depth of 9.5 km. For context, this was a light earthquake commonly felt near the epicenter.
Where did the earthquake occur?
The earthquake epicenter was located at -15.3390°, -177.4629°, which is 133 km SSE of Alo, Wallis and Futuna.
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.
Actions
Authoritative source: USGS event page (event ID: us6000kp5g). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, June 21, 2023). M4.5 Earthquake 133 km SSE of Alo, Wallis and Futuna — June 21, 2023. Retrieved August 26, 2023 from https://www.earthquaketracker.org/earthquakes/event/us6000kp5g/