M4.5 Earthquake 198 km W of Naze, Japan — June 21, 2021
2021-06-21 20:55:26 UTC (2021-06-21) · approx. 4:55 AM UTC+8 local
On June 21, 2021 at 20:55 UTC, a magnitude 4.5 intermediate depth earthquake struck 198 km W of Naze, Japan, at a depth of 239.5 km and coordinates 28.3661°, 127.4566°.
Physical scale: An earthquake of magnitude 4.5 releases seismic energy equivalent to roughly 85 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 767 m — 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
127.4566°E
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Common Questions
How strong was the magnitude 4.5 earthquake near Naze, Japan?
The magnitude 4.5 earthquake that struck 198 km W of Naze, Japan on June 21, 2021 at 20:55 UTC had a depth of 239.5 km. For context, this was a light earthquake commonly felt near the epicenter.
Where did the earthquake occur?
The earthquake epicenter was located at 28.3661°, 127.4566°, which is 198 km W of Naze, Japan. View all earthquakes in Japan.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.5 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 4.5 event is significantly smaller than that historical record.
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Location
Authoritative source: USGS event page (event ID: us7000ef14). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, June 21, 2021). M4.5 Earthquake 198 km W of Naze, Japan — June 21, 2021. Retrieved August 27, 2021 from https://www.earthquaketracker.org/earthquakes/event/us7000ef14/