M4.3 Earthquake 12 km E of Miyako, Japan — February 23, 2023
2023-02-23 19:23:38 UTC (2023-02-23) · approx. 4:23 AM UTC+9 local
On February 23, 2023 at 19:23 UTC, a magnitude 4.3 shallow crustal earthquake struck 12 km E of Miyako, Japan, at a depth of 55.0 km and coordinates 39.6657°, 142.0799°.
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
142.0799°E
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Common Questions
How strong was the magnitude 4.3 earthquake near Miyako, Japan?
The magnitude 4.3 earthquake that struck 12 km E of Miyako, Japan on February 23, 2023 at 19:23 UTC had a depth of 55.0 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 4.3 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: us6000jr2v). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, February 23, 2023). M4.3 Earthquake 12 km E of Miyako, Japan — February 23, 2023. Retrieved April 29, 2023 from https://www.earthquaketracker.org/earthquakes/event/us6000jr2v/