M4.4 Earthquake west of Macquarie Island — September 11, 2023
2023-09-11 20:04:08 UTC (2023-09-11) · approx. 5:04 AM UTC+9 local
On September 11, 2023 at 20:04 UTC, a magnitude 4.4 shallow crustal earthquake struck west of Macquarie Island, at a depth of 10.0 km and coordinates -53.9949°, 140.2234°.
Physical scale: An earthquake of magnitude 4.4 releases seismic energy equivalent to roughly 60 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 655 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
140.2234°E
Technical Information
Common Questions
How strong was the magnitude 4.4 earthquake west of Macquarie Island?
The magnitude 4.4 earthquake that struck west of Macquarie Island on September 11, 2023 at 20:04 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 4.4 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 4.4 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us7000kvyb). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, September 11, 2023). M4.4 Earthquake west of Macquarie Island — September 11, 2023. Retrieved November 18, 2023 from https://www.earthquaketracker.org/earthquakes/event/us7000kvyb/