M4.0 Earthquake 66 km NW of Yonakuni, Japan — January 25, 2021
2021-01-25 20:34:06 UTC (2021-01-25) · approx. 4:34 AM UTC+8 local
On January 25, 2021 at 20:34 UTC, a magnitude 4.0 shallow crustal earthquake struck 66 km NW of Yonakuni, Japan, at a depth of 10.0 km and coordinates 24.9570°, 122.6254°.
Physical scale: An earthquake of magnitude 4.0 releases seismic energy equivalent to roughly 15 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 347 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
122.6254°E
Technical Information
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Common Questions
How strong was the magnitude 4.0 earthquake near Yonakuni, Japan?
The magnitude 4.0 earthquake that struck 66 km NW of Yonakuni, Japan on January 25, 2021 at 20:34 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 4.0 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 4.0 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us6000ddwq). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, January 25, 2021). M4.0 Earthquake 66 km NW of Yonakuni, Japan — January 25, 2021. Retrieved April 13, 2021 from https://www.earthquaketracker.org/earthquakes/event/us6000ddwq/