M4.2 Earthquake 120 km S of Koshima, Japan — June 14, 2023
2023-06-14 14:28:32 UTC (2023-06-14) · approx. 11:28 PM UTC+9 local
On June 14, 2023 at 14:28 UTC, a magnitude 4.2 shallow crustal earthquake struck 120 km S of Koshima, Japan, at a depth of 35.0 km and coordinates 29.1514°, 130.5682°.
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
130.5682°E
Technical Information
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Common Questions
How strong was the magnitude 4.2 earthquake near Koshima, Japan?
The magnitude 4.2 earthquake that struck 120 km S of Koshima, Japan on June 14, 2023 at 14:28 UTC had a depth of 35.0 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: us7000ka49). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, June 14, 2023). M4.2 Earthquake 120 km S of Koshima, Japan — June 14, 2023. Retrieved August 21, 2023 from https://www.earthquaketracker.org/earthquakes/event/us7000ka49/