M4.1 Earthquake 281 km N of Ama, Japan — July 19, 2026
2026-07-19 01:40:05 UTC (2 hours ago) · approx. 10:40 AM UTC+9 local
On July 19, 2026 at 01:40 UTC, a magnitude 4.1 deep-focus earthquake struck 281 km N of Ama, Japan, at a depth of 459.8 km and coordinates 38.6177°, 133.4192°.
Physical scale: An earthquake of magnitude 4.1 releases seismic energy equivalent to roughly 21 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 406 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
133.4192°E
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Common Questions
How strong was the magnitude 4.1 earthquake near Ama, Japan?
The magnitude 4.1 earthquake that struck 281 km N of Ama, Japan on July 19, 2026 at 01:40 UTC had a depth of 459.8 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 4.1 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 4.1 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us7000t1q1). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, July 19, 2026). M4.1 Earthquake 281 km N of Ama, Japan — July 19, 2026. Retrieved July 19, 2026 from https://www.earthquaketracker.org/earthquakes/event/us7000t1q1/