M4.3 Earthquake 57 km SE of Nemuro, Japan — February 22, 2026
2026-02-22 16:37:47 UTC (2026-02-22) · approx. 2:37 AM UTC+10 local
On February 22, 2026 at 16:37 UTC, a magnitude 4.3 shallow crustal earthquake struck 57 km SE of Nemuro, Japan, at a depth of 67.9 km and coordinates 42.9509°, 146.0595°.
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 1 day ago 31 km S 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.
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
146.0595°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 57 km SE of Nemuro, Japan on February 22, 2026 at 16:37 UTC had a depth of 67.9 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 31 km S 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: us6000sasy). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, February 22, 2026). M4.3 Earthquake 57 km SE of Nemuro, Japan — February 22, 2026. Retrieved May 12, 2026 from https://www.earthquaketracker.org/earthquakes/event/us6000sasy/