M5.1 Earthquake 92 km NNW of Hirara, Japan — October 5, 2021
2021-10-05 18:03:42 UTC (2021-10-05) · approx. 2:03 AM UTC+8 local
Felt by 1 person across nearby locations.
On October 5, 2021 at 18:03 UTC, a magnitude 5.1 shallow crustal earthquake struck 92 km NNW of Hirara, Japan, at a depth of 10.0 km and coordinates 25.6166°, 125.0749°.
Physical scale: An earthquake of magnitude 5.1 releases seismic energy equivalent to roughly 674 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 2.0 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 1 citizen response 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
125.0749°E
Technical Information
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Common Questions
How strong was the magnitude 5.1 earthquake near Hirara, Japan?
The magnitude 5.1 earthquake that struck 92 km NNW of Hirara, Japan on October 5, 2021 at 18:03 UTC had a depth of 10.0 km. For context, this was a moderate earthquake that could be widely felt.
Where did the earthquake occur?
The earthquake epicenter was located at 25.6166°, 125.0749°, which is 92 km NNW of Hirara, Japan. View all earthquakes in Japan.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 5.1 earthquakes can continue for days to weeks 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 5.1 event is significantly smaller than that historical record.
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Location
Authoritative source: USGS event page (event ID: us6000frzp). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, October 5, 2021). M5.1 Earthquake 92 km NNW of Hirara, Japan — October 5, 2021. Retrieved December 22, 2025 from https://www.earthquaketracker.org/earthquakes/event/us6000frzp/