M4.3 Earthquake west of Macquarie Island — November 12, 2022
2022-11-12 18:59:49 UTC (2022-11-12) · approx. 4:59 AM UTC+10 local
On November 12, 2022 at 18:59 UTC, a magnitude 4.3 shallow crustal earthquake struck west of Macquarie Island, at a depth of 10.0 km and coordinates -56.6019°, 147.8464°.
Physical scale: An earthquake of magnitude 4.3 releases seismic energy equivalent to roughly 43 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 558 m — 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 5.1 mainshock that occurred 23 days ago west of Macquarie Island. 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.
Earthquake Details
147.8464°E
Technical Information
Common Questions
How strong was the magnitude 4.3 earthquake west of Macquarie Island?
The magnitude 4.3 earthquake that struck west of Macquarie Island on November 12, 2022 at 18:59 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 4.3 earthquakes can continue for several days and gradually diminish over time.
Is this the same earthquake as the M5.1 one earlier?
No. This magnitude 4.3 earthquake is an aftershock of the larger magnitude 5.1 mainshock that occurred earlier west of Macquarie Island. Aftershocks are smaller earthquakes triggered by stress changes from the mainshock.
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Understanding This Data
Magnitude 4.3 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us7000iqg9). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2022, November 12, 2022). M4.3 Earthquake west of Macquarie Island — November 12, 2022. Retrieved January 28, 2023 from https://www.earthquaketracker.org/earthquakes/event/us7000iqg9/