M5.0 Earthquake 51 km ESE of Koshima, Japan — February 9, 2021
2021-02-09 03:39:28 UTC (2021-02-09) · approx. 12:39 PM UTC+9 local
0
On February 9, 2021 at 03:39 UTC, a magnitude 5.0 shallow crustal earthquake struck 51 km ESE of Koshima, Japan, at a depth of 35.0 km and coordinates 30.0520°, 131.0214°.0
Physical scale: An earthquake of magnitude 5.0 releases seismic energy equivalent to roughly 477 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 1.7 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 submitted 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
131.0214°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 5.0 earthquake near Koshima, Japan?
The magnitude 5.0 earthquake that struck 51 km ESE of Koshima, Japan on February 9, 2021 at 03:39 UTC had a depth of 35.0 km. For context, this was a moderate earthquake that could be widely felt.
Where did the earthquake occur?
The earthquake epicenter was located at 30.0520°, 131.0214°, which is 51 km ESE of Koshima, Japan. View all earthquakes in Japan.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 5.0 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 5.0 event is significantly smaller than that historical record.
Actions
Location
Authoritative source: USGS event page (event ID: us6000dfsx). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, February 9, 2021). M5.0 Earthquake 51 km ESE of Koshima, Japan — February 9, 2021. Retrieved April 22, 2021 from https://www.earthquaketracker.org/earthquakes/event/us6000dfsx/