M4.3 Earthquake 211 km SSE of Katsuura, Japan — April 1, 2021
2021-04-01 21:51:16 UTC (2021-04-01) · approx. 6:51 AM UTC+9 local
On April 1, 2021 at 21:51 UTC, a magnitude 4.3 shallow crustal earthquake struck 211 km SSE of Katsuura, Japan, at a depth of 29.5 km and coordinates 33.4136°, 141.2818°.
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.
Earthquake Details
141.2818°E
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Common Questions
How strong was the magnitude 4.3 earthquake near Katsuura, Japan?
The magnitude 4.3 earthquake that struck 211 km SSE of Katsuura, Japan on April 1, 2021 at 21:51 UTC had a depth of 29.5 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.
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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: us6000e09s). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, April 1, 2021). M4.3 Earthquake 211 km SSE of Katsuura, Japan — April 1, 2021. Retrieved June 8, 2021 from https://www.earthquaketracker.org/earthquakes/event/us6000e09s/