M4.5 Earthquake 52 km SSE of Hasaki, Japan — July 28, 2021
2021-07-28 18:19:52 UTC (2021-07-28) · approx. 3:19 AM UTC+9 local
On July 28, 2021 at 18:19 UTC, a magnitude 4.5 shallow crustal earthquake struck 52 km SSE of Hasaki, Japan, at a depth of 37.5 km and coordinates 35.3003°, 141.0774°.
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
141.0774°E
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Common Questions
How strong was the magnitude 4.5 earthquake near Hasaki, Japan?
The magnitude 4.5 earthquake that struck 52 km SSE of Hasaki, Japan on July 28, 2021 at 18:19 UTC had a depth of 37.5 km. For context, this was a light earthquake commonly felt near the epicenter.
Where did the earthquake occur?
The earthquake epicenter was located at 35.3003°, 141.0774°, which is 52 km SSE of Hasaki, 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: us6000ezx7). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, July 28, 2021). M4.5 Earthquake 52 km SSE of Hasaki, Japan — July 28, 2021. Retrieved October 3, 2021 from https://www.earthquaketracker.org/earthquakes/event/us6000ezx7/