M4.8 Earthquake 111 km E of Miyako, Japan — August 28, 2026
2026-08-28 23:10:35 UTC (2026-08-28) · approx. 9:10 AM UTC+10 local
On August 28, 2026 at 23:10 UTC, a magnitude 4.8 shallow crustal earthquake struck 111 km E of Miyako, Japan, at a depth of 29.2 km and coordinates 39.6595°, 143.2392°. This earthquake was detected by 67 seismic stations with good location accuracy and was assigned a USGS significance rating of 354, placing it among routine seismic activity.
Physical scale: An earthquake of magnitude 4.8 releases seismic energy equivalent to roughly 239 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 1.2 km — a useful intuition for the size of the slip patch on the fault.
The epicenter is located in Japan, a region characterized by the intersection of four tectonic plates — Pacific, Philippine Sea, Eurasian, and North American — creating multiple subduction zones. The nearest mapped fault system is the Japan Trench. View all earthquakes in Japan.
Learn more: Magnitude scale · Aftershock sequences
Earthquake Details
143.2392°E
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Common Questions
How strong was the magnitude 4.8 earthquake near Miyako, Japan?
The magnitude 4.8 earthquake that struck 111 km E of Miyako, Japan on August 28, 2026 at 23:10 UTC had a depth of 29.2 km. For context, this was a light earthquake commonly felt near the epicenter.
Where did the earthquake occur?
The earthquake epicenter was located at 39.6595°, 143.2392°, which is 111 km E of Miyako, Japan. View all earthquakes in Japan.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.8 earthquakes can continue for several days and gradually diminish over time.
Has Japan had earthquakes this big before?
The largest recorded earthquake in Japan was the M9.1 Tohoku earthquake of March 11, 2011. Today's magnitude 4.8 event is significantly smaller than that historical record.
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Location
Authoritative source: USGS event page (event ID: us7000tcqg). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, August 28, 2026). M4.8 Earthquake 111 km E of Miyako, Japan — August 28, 2026. Retrieved September 15, 2026 from https://www.earthquaketracker.org/earthquakes/event/us7000tcqg/