M4.9 Earthquake 103 km ESE of Nemuro, Japan — June 21, 2025
2025-06-21 15:05:22 UTC (2025-06-21) · approx. 1:05 AM UTC+10 local
On June 21, 2025 at 15:05 UTC, a magnitude 4.9 shallow crustal earthquake struck 103 km ESE of Nemuro, Japan, at a depth of 19.5 km and coordinates 42.8497°, 146.6636°. This earthquake was detected by 153 seismic stations with good location accuracy and was assigned a USGS significance rating of 369, placing it among routine seismic activity.
Physical scale: An earthquake of magnitude 4.9 releases seismic energy equivalent to roughly 338 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 1.4 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
146.6636°E
Technical Information
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Common Questions
How strong was the magnitude 4.9 earthquake near Nemuro, Japan?
The magnitude 4.9 earthquake that struck 103 km ESE of Nemuro, Japan on June 21, 2025 at 15:05 UTC had a depth of 19.5 km. For context, this was a light earthquake commonly felt near the epicenter.
Where did the earthquake occur?
The earthquake epicenter was located at 42.8497°, 146.6636°, which is 103 km ESE of Nemuro, Japan. View all earthquakes in Japan.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.9 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 4.9 event is significantly smaller than that historical record.
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Location
Authoritative source: USGS event page (event ID: us6000qlmq). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2025, June 21, 2025). M4.9 Earthquake 103 km ESE of Nemuro, Japan — June 21, 2025. Retrieved September 2, 2025 from https://www.earthquaketracker.org/earthquakes/event/us6000qlmq/