M4.3 Earthquake 37 km SSE of Shizunai-furukawach?, Japan — December 28, 2021
2021-12-28 20:47:37 UTC (2021-12-28) · approx. 6:47 AM UTC+10 local
On December 28, 2021 at 20:47 UTC, a magnitude 4.3 shallow crustal earthquake struck 37 km SSE of Shizunai-furukawach?, Japan, at a depth of 62.6 km and coordinates 42.0397°, 142.5941°.
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 6.0 mainshock that occurred 24 days ago 32 km SSW of Honchō, Japan. Since the mainshock, the USGS has recorded 0 aftershocks in this area. Aftershock activity is expected to continue for weeks to months as stresses on surrounding faults redistribute.
Did You Feel It? — community-reported shaking
Aggregated felt-report intensity from 1 citizen response to the USGS Did You Feel It? system. Each colored zone represents the average MMI from reports in that area.
Source: U.S. Geological Survey Did You Feel It?. View on USGS · submit your own report
Earthquake Details
142.5941°E
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Common Questions
How strong was the magnitude 4.3 earthquake near Shizunai-furukawach?, Japan?
The magnitude 4.3 earthquake that struck 37 km SSE of Shizunai-furukawach?, Japan on December 28, 2021 at 20:47 UTC had a depth of 62.6 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.
Is this the same earthquake as the M6.0 one earlier?
No. This magnitude 4.3 earthquake is an aftershock of the larger magnitude 6.0 mainshock that occurred earlier 32 km SSW of Honchō, Japan. 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: us6000gfxq). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, December 28, 2021). M4.3 Earthquake 37 km SSE of Shizunai-furukawach?, Japan — December 28, 2021. Retrieved March 5, 2022 from https://www.earthquaketracker.org/earthquakes/event/us6000gfxq/