M4.3 Earthquake 66 km NE of Mutsu, Japan — December 7, 2021
2021-12-07 20:50:16 UTC (2021-12-07) · approx. 5:50 AM UTC+9 local
On December 7, 2021 at 20:50 UTC, a magnitude 4.3 shallow crustal earthquake struck 66 km NE of Mutsu, Japan, at a depth of 56.6 km and coordinates 41.6372°, 141.8613°.
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
141.8613°E
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Common Questions
How strong was the magnitude 4.3 earthquake near Mutsu, Japan?
The magnitude 4.3 earthquake that struck 66 km NE of Mutsu, Japan on December 7, 2021 at 20:50 UTC had a depth of 56.6 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: us6000ga80). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, December 7, 2021). M4.3 Earthquake 66 km NE of Mutsu, Japan — December 7, 2021. Retrieved February 12, 2022 from https://www.earthquaketracker.org/earthquakes/event/us6000ga80/