M3.9 Earthquake 3 km WNW of Sano, Japan — March 28, 2023
2023-03-28 23:48:45 UTC (2023-03-28) · approx. 8:48 AM UTC+9 local
On March 28, 2023 at 23:48 UTC, a magnitude 3.9 intermediate depth earthquake struck 3 km WNW of Sano, Japan, at a depth of 133.6 km and coordinates 36.3306°, 139.5527°.
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
139.5527°E
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Common Questions
How strong was the magnitude 3.9 earthquake near Sano, Japan?
The magnitude 3.9 earthquake that struck 3 km WNW of Sano, Japan on March 28, 2023 at 23:48 UTC had a depth of 133.6 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: us6000k0ga). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, March 28, 2023). M3.9 Earthquake 3 km WNW of Sano, Japan — March 28, 2023. Retrieved June 3, 2023 from https://www.earthquaketracker.org/earthquakes/event/us6000k0ga/