M4.1 Earthquake 229 km SSE of Katsuura, Japan — December 23, 2023
2023-12-23 20:38:24 UTC (2023-12-23) · approx. 5:38 AM UTC+9 local
On December 23, 2023 at 20:38 UTC, a magnitude 4.1 shallow crustal earthquake struck 229 km SSE of Katsuura, Japan, at a depth of 35.3 km and coordinates 33.2631°, 141.3365°.
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
141.3365°E
Technical Information
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Common Questions
How strong was the magnitude 4.1 earthquake near Katsuura, Japan?
The magnitude 4.1 earthquake that struck 229 km SSE of Katsuura, Japan on December 23, 2023 at 20:38 UTC had a depth of 35.3 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: us6000m1ph). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, December 23, 2023). M4.1 Earthquake 229 km SSE of Katsuura, Japan — December 23, 2023. Retrieved February 27, 2024 from https://www.earthquaketracker.org/earthquakes/event/us6000m1ph/