M4.2 Earthquake near near the east coast of Honshu, Japan — March 12, 2023
2023-03-12 20:25:34 UTC (2023-03-12) · approx. 5:25 AM UTC+9 local
On March 12, 2023 at 20:25 UTC, a magnitude 4.2 intermediate depth earthquake struck near near the east coast of Honshu, Japan, at a depth of 88.6 km and coordinates 39.5736°, 142.3764°.
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
142.3764°E
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Common Questions
How strong was the magnitude 4.2 earthquake near near the east coast of Honshu, Japan?
The magnitude 4.2 earthquake that struck near near the east coast of Honshu, Japan on March 12, 2023 at 20:25 UTC had a depth of 88.6 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: us7000jjdw). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, March 12, 2023). M4.2 Earthquake near near the east coast of Honshu, Japan — March 12, 2023. Retrieved May 20, 2023 from https://www.earthquaketracker.org/earthquakes/event/us7000jjdw/