M4.1 Earthquake 166 km SE of Shima, Japan — February 21, 2024
2024-02-21 21:44:03 UTC (2024-02-21) · approx. 6:44 AM UTC+9 local
On February 21, 2024 at 21:44 UTC, a magnitude 4.1 deep-focus earthquake struck 166 km SE of Shima, Japan, at a depth of 322.8 km and coordinates 33.1212°, 137.8965°.
Physical scale: An earthquake of magnitude 4.1 releases seismic energy equivalent to roughly 21 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 406 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
137.8965°E
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Common Questions
How strong was the magnitude 4.1 earthquake near Shima, Japan?
The magnitude 4.1 earthquake that struck 166 km SE of Shima, Japan on February 21, 2024 at 21:44 UTC had a depth of 322.8 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 4.1 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 4.1 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us7000m0mu). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2024, February 21, 2024). M4.1 Earthquake 166 km SE of Shima, Japan — February 21, 2024. Retrieved May 2, 2024 from https://www.earthquaketracker.org/earthquakes/event/us7000m0mu/