M4.2 Earthquake 6 km SW of Onagawa Chō, Japan — April 29, 2025
2025-04-29 17:30:34 UTC (2025-04-29) · approx. 2:30 AM UTC+9 local
On April 29, 2025 at 17:30 UTC, a magnitude 4.2 shallow crustal earthquake struck 6 km SW of Onagawa Chō, Japan, at a depth of 63.3 km and coordinates 38.4027°, 141.3992°.
Physical scale: An earthquake of magnitude 4.2 releases seismic energy equivalent to roughly 30 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 476 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
141.3992°E
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Common Questions
How strong was the magnitude 4.2 earthquake near Onagawa Chō, Japan?
The magnitude 4.2 earthquake that struck 6 km SW of Onagawa Chō, Japan on April 29, 2025 at 17:30 UTC had a depth of 63.3 km. For context, this was a light earthquake commonly felt near the epicenter.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.2 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 4.2 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us7000pzdr). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2025, April 29, 2025). M4.2 Earthquake 6 km SW of Onagawa Chō, Japan — April 29, 2025. Retrieved July 11, 2025 from https://www.earthquaketracker.org/earthquakes/event/us7000pzdr/