M3.9 Earthquake near near the west coast of Honshu, Japan — April 11, 2023
2023-04-11 20:35:20 UTC (2023-04-11) · approx. 5:35 AM UTC+9 local
On April 11, 2023 at 20:35 UTC, a magnitude 3.9 intermediate depth earthquake struck near near the west coast of Honshu, Japan, at a depth of 265.2 km and coordinates 37.0589°, 137.1531°.
Physical scale: An earthquake of magnitude 3.9 releases seismic energy equivalent to roughly 11 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 296 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
137.1531°E
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Common Questions
How strong was the magnitude 3.9 earthquake near near the west coast of Honshu, Japan?
The magnitude 3.9 earthquake that struck near near the west coast of Honshu, Japan on April 11, 2023 at 20:35 UTC had a depth of 265.2 km. For context, this was a minor earthquake typically detected only by instruments.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 3.9 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 3.9 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: us6000k3m1). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, April 11, 2023). M3.9 Earthquake near near the west coast of Honshu, Japan — April 11, 2023. Retrieved June 17, 2023 from https://www.earthquaketracker.org/earthquakes/event/us6000k3m1/