M4.8 Earthquake 45 km ESE of Hitachi, Japan — August 26, 2021
2021-08-26 20:46:07 UTC (2021-08-26) · approx. 5:46 AM UTC+9 local
Felt by 4 people across nearby locations.
On August 26, 2021 at 20:46 UTC, a magnitude 4.8 shallow crustal earthquake struck 45 km ESE of Hitachi, Japan, at a depth of 34.4 km and coordinates 36.4446°, 141.1201°.
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
Did You Feel It? — community-reported shaking
Aggregated felt-report intensity from 4 citizen responses to the USGS Did You Feel It? system. Each colored zone represents the average MMI from reports in that area.
Source: U.S. Geological Survey Did You Feel It?. View on USGS · submit your own report
Earthquake Details
141.1201°E
Technical Information
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Common Questions
How strong was the magnitude 4.8 earthquake near Hitachi, Japan?
The magnitude 4.8 earthquake that struck 45 km ESE of Hitachi, Japan on August 26, 2021 at 20:46 UTC had a depth of 34.4 km. For context, this was a light earthquake commonly felt near the epicenter.
Where did the earthquake occur?
The earthquake epicenter was located at 36.4446°, 141.1201°, which is 45 km ESE of Hitachi, 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: us7000f4eg). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, August 26, 2021). M4.8 Earthquake 45 km ESE of Hitachi, Japan — August 26, 2021. Retrieved November 8, 2021 from https://www.earthquaketracker.org/earthquakes/event/us7000f4eg/