M4.3 Earthquake 272 km SSE of Shimoda, Japan — December 26, 2021
2021-12-26 22:26:37 UTC (2021-12-26) · approx. 7:26 AM UTC+9 local
On December 26, 2021 at 22:26 UTC, a magnitude 4.3 shallow crustal earthquake struck 272 km SSE of Shimoda, Japan, at a depth of 10.0 km and coordinates 32.2820°, 139.5904°.
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
139.5904°E
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Common Questions
How strong was the magnitude 4.3 earthquake near Shimoda, Japan?
The magnitude 4.3 earthquake that struck 272 km SSE of Shimoda, Japan on December 26, 2021 at 22:26 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.
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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: us7000g9mx). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, December 26, 2021). M4.3 Earthquake 272 km SSE of Shimoda, Japan — December 26, 2021. Retrieved March 5, 2022 from https://www.earthquaketracker.org/earthquakes/event/us7000g9mx/