M5.1 Earthquake 113 km S of Koshima, Japan — February 18, 2026
2026-02-18 02:27:47 UTC (2026-02-18) · approx. 11:27 AM UTC+9 local
Felt by 1 person across nearby locations.
On February 18, 2026 at 02:27 UTC, a magnitude 5.1 shallow crustal earthquake struck 113 km S of Koshima, Japan, at a depth of 31.7 km and coordinates 29.2093°, 130.5899°. This earthquake was detected by 113 seismic stations with excellent location accuracy and was assigned a USGS significance rating of 400, placing it among routine seismic activity.
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
130.5899°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 5.1 earthquake near Koshima, Japan?
The magnitude 5.1 earthquake that struck 113 km S of Koshima, Japan on February 18, 2026 at 02:27 UTC had a depth of 31.7 km. For context, this was a moderate earthquake that could be widely felt.
Where did the earthquake occur?
The earthquake epicenter was located at 29.2093°, 130.5899°, which is 113 km S of Koshima, 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.
What should I do after an earthquake?
If you were in the affected area: check yourself and others for injuries, inspect your home for damage, and be prepared for aftershocks. For detailed guidance, see our earthquake safety guide and emergency planning resources.
Authoritative source: USGS event page (event ID: us6000s9wt). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, February 18, 2026). M5.1 Earthquake 113 km S of Koshima, Japan — February 18, 2026. Retrieved May 13, 2026 from https://www.earthquaketracker.org/earthquakes/event/us6000s9wt/