M4.5 Earthquake 119 km SE of Alo, Wallis and Futuna — September 9, 2023
2023-09-09 21:57:49 UTC (2023-09-09) · approx. 9:57 AM UTC-12 local
On September 9, 2023 at 21:57 UTC, a magnitude 4.5 deep-focus earthquake struck 119 km SE of Alo, Wallis and Futuna, at a depth of 377.7 km and coordinates -15.1298°, -177.3867°. This earthquake was detected by 31 seismic stations with excellent 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
-177.3867°E
Technical Information
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Common Questions
How strong was the magnitude 4.5 earthquake near Alo, Wallis and Futuna?
The magnitude 4.5 earthquake that struck 119 km SE of Alo, Wallis and Futuna on September 9, 2023 at 21:57 UTC had a depth of 377.7 km. For context, this was a light earthquake commonly felt near the epicenter.
Where did the earthquake occur?
The earthquake epicenter was located at -15.1298°, -177.3867°, which is 119 km SE 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: us7000kvqx). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, September 9, 2023). M4.5 Earthquake 119 km SE of Alo, Wallis and Futuna — September 9, 2023. Retrieved November 17, 2023 from https://www.earthquaketracker.org/earthquakes/event/us7000kvqx/