M4.3 Earthquake 6 km ENE of Ōtaki, Japan — March 27, 2025
2025-03-27 18:50:39 UTC (2025-03-27) · approx. 3:50 AM UTC+9 local
Felt by 20 people across nearby locations.
On March 27, 2025 at 18:50 UTC, a magnitude 4.3 shallow crustal earthquake struck 6 km ENE of Ōtaki, Japan, at a depth of 45.4 km and coordinates 35.3075°, 140.3116°. This earthquake was detected by 75 seismic stations with good location accuracy and was assigned a USGS significance rating of 291, placing it among routine seismic activity.
Physical scale: An earthquake of magnitude 4.3 releases seismic energy equivalent to roughly 43 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 558 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
Did You Feel It? — community-reported shaking
Aggregated felt-report intensity from 20 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
140.3116°E
Technical Information
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Common Questions
How strong was the magnitude 4.3 earthquake near Ōtaki, Japan?
The magnitude 4.3 earthquake that struck 6 km ENE of Ōtaki, Japan on March 27, 2025 at 18:50 UTC had a depth of 45.4 km. For context, this was a light earthquake commonly felt near the epicenter.
Where did the earthquake occur?
The earthquake epicenter was located at 35.3075°, 140.3116°, which is 6 km ENE of Ōtaki, Japan. View all earthquakes in Japan.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.3 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 4.3 event is significantly smaller than that historical record.
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Location
Authoritative source: USGS event page (event ID: us7000pn5c). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2025, March 27, 2025). M4.3 Earthquake 6 km ENE of Ōtaki, Japan — March 27, 2025. Retrieved September 6, 2025 from https://www.earthquaketracker.org/earthquakes/event/us7000pn5c/