M4.0 Earthquake 56 km NNE of Nanao, Japan — January 12, 2023
2023-01-12 21:13:58 UTC (2023-01-12) · approx. 6:13 AM UTC+9 local
On January 12, 2023 at 21:13 UTC, a magnitude 4.0 shallow crustal earthquake struck 56 km NNE of Nanao, Japan, at a depth of 9.2 km and coordinates 37.4773°, 137.3197°.
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
137.3197°E
Technical Information
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Common Questions
How strong was the magnitude 4.0 earthquake near Nanao, Japan?
The magnitude 4.0 earthquake that struck 56 km NNE of Nanao, Japan on January 12, 2023 at 21:13 UTC had a depth of 9.2 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: us7000j5u4). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, January 12, 2023). M4.0 Earthquake 56 km NNE of Nanao, Japan — January 12, 2023. Retrieved March 20, 2023 from https://www.earthquaketracker.org/earthquakes/event/us7000j5u4/