M4.3 Earthquake 76 km SW of Yonakuni, Japan — December 4, 2021
2021-12-04 20:24:36 UTC (2021-12-04) · approx. 4:24 AM UTC+8 local
On December 4, 2021 at 20:24 UTC, a magnitude 4.3 shallow crustal earthquake struck 76 km SW of Yonakuni, Japan, at a depth of 25.3 km and coordinates 23.9689°, 122.4801°.
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.
Earthquake Details
122.4801°E
Technical Information
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Common Questions
How strong was the magnitude 4.3 earthquake near Yonakuni, Japan?
The magnitude 4.3 earthquake that struck 76 km SW of Yonakuni, Japan on December 4, 2021 at 20:24 UTC had a depth of 25.3 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.
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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: us6000gakc). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, December 4, 2021). M4.3 Earthquake 76 km SW of Yonakuni, Japan — December 4, 2021. Retrieved February 12, 2022 from https://www.earthquaketracker.org/earthquakes/event/us6000gakc/