M4.3 Earthquake 288 km E of Miyako, Japan — July 20, 2025
2025-07-20 22:59:44 UTC (2025-07-20) · approx. 8:59 AM UTC+10 local
On July 20, 2025 at 22:59 UTC, a magnitude 4.3 shallow crustal earthquake struck 288 km E of Miyako, Japan, at a depth of 10.0 km and coordinates 40.0496°, 145.2750°.
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
145.2750°E
Technical Information
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Common Questions
How strong was the magnitude 4.3 earthquake near Miyako, Japan?
The magnitude 4.3 earthquake that struck 288 km E of Miyako, Japan on July 20, 2025 at 22:59 UTC had a depth of 10.0 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: us6000qxf9). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2025, July 20, 2025). M4.3 Earthquake 288 km E of Miyako, Japan — July 20, 2025. Retrieved October 3, 2025 from https://www.earthquaketracker.org/earthquakes/event/us6000qxf9/