M4.3 Earthquake 48 km ESE of Yonakuni, Japan — July 9, 2023
2023-07-09 19:20:14 UTC (2023-07-09) · approx. 3:20 AM UTC+8 local
On July 9, 2023 at 19:20 UTC, a magnitude 4.3 shallow crustal earthquake struck 48 km ESE of Yonakuni, Japan, at a depth of 48.8 km and coordinates 24.2262°, 123.4016°.
Physical scale: An earthquake of magnitude 4.3 releases seismic energy equivalent to roughly 43 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 558 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
123.4016°E
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Common Questions
How strong was the magnitude 4.3 earthquake near Yonakuni, Japan?
The magnitude 4.3 earthquake that struck 48 km ESE of Yonakuni, Japan on July 9, 2023 at 19:20 UTC had a depth of 48.8 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 4.3 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 4.3 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us7000kgea). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, July 9, 2023). M4.3 Earthquake 48 km ESE of Yonakuni, Japan — July 9, 2023. Retrieved September 16, 2023 from https://www.earthquaketracker.org/earthquakes/event/us7000kgea/