M4.3 Earthquake 47 km SSE of Nemuro, Japan — November 3, 2021
2021-11-03 15:58:11 UTC (2021-11-03) · approx. 1:58 AM UTC+10 local
On November 3, 2021 at 15:58 UTC, a magnitude 4.3 shallow crustal earthquake struck 47 km SSE of Nemuro, Japan, at a depth of 43.9 km and coordinates 42.9402°, 145.8427°.
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 5.0 mainshock that occurred 24 days ago 27 km SSE of Nemuro, Japan. 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
145.8427°E
Technical Information
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Common Questions
How strong was the magnitude 4.3 earthquake near Nemuro, Japan?
The magnitude 4.3 earthquake that struck 47 km SSE of Nemuro, Japan on November 3, 2021 at 15:58 UTC had a depth of 43.9 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 M5.0 one earlier?
No. This magnitude 4.3 earthquake is an aftershock of the larger magnitude 5.0 mainshock that occurred earlier 27 km SSE of Nemuro, 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: us7000fsmh). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, November 3, 2021). M4.3 Earthquake 47 km SSE of Nemuro, Japan — November 3, 2021. Retrieved January 14, 2022 from https://www.earthquaketracker.org/earthquakes/event/us7000fsmh/