M4.2 Earthquake 89 km ENE of Namie, Japan — April 2, 2021
2021-04-02 16:36:30 UTC (2021-04-02) · approx. 1:36 AM UTC+9 local
On April 2, 2021 at 16:36 UTC, a magnitude 4.2 shallow crustal earthquake struck 89 km ENE of Namie, Japan, at a depth of 51.6 km and coordinates 37.6834°, 141.9822°.
Physical scale: An earthquake of magnitude 4.2 releases seismic energy equivalent to roughly 30 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 476 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
141.9822°E
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Common Questions
How strong was the magnitude 4.2 earthquake near Namie, Japan?
The magnitude 4.2 earthquake that struck 89 km ENE of Namie, Japan on April 2, 2021 at 16:36 UTC had a depth of 51.6 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 4.2 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 4.2 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us6000dyk9). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, April 2, 2021). M4.2 Earthquake 89 km ENE of Namie, Japan — April 2, 2021. Retrieved June 12, 2021 from https://www.earthquaketracker.org/earthquakes/event/us6000dyk9/