M4.0 Earthquake 30 km E of Gojōnome, Japan — May 9, 2023
2023-05-09 23:42:02 UTC (2023-05-09) · approx. 8:42 AM UTC+9 local
On May 9, 2023 at 23:42 UTC, a magnitude 4.0 intermediate depth earthquake struck 30 km E of Gojōnome, Japan, at a depth of 154.7 km and coordinates 39.9027°, 140.4653°.
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
140.4653°E
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Common Questions
How strong was the magnitude 4.0 earthquake near Gojōnome, Japan?
The magnitude 4.0 earthquake that struck 30 km E of Gojōnome, Japan on May 9, 2023 at 23:42 UTC had a depth of 154.7 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: us6000karh). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, May 9, 2023). M4.0 Earthquake 30 km E of Gojōnome, Japan — May 9, 2023. Retrieved July 22, 2023 from https://www.earthquaketracker.org/earthquakes/event/us6000karh/