M4.3 Earthquake 16 km E of Amakusa, Japan — August 8, 2026
2026-08-08 23:02:07 UTC (1 hour ago) · approx. 8:02 AM UTC+9 local
On August 8, 2026 at 23:02 UTC, a magnitude 4.3 shallow crustal earthquake struck 16 km E of Amakusa, Japan, at a depth of 10.0 km and coordinates 32.4533°, 130.3704°.
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.
This earthquake is part of an ongoing aftershock sequence following the magnitude 5.0 mainshock that occurred 9 days ago 2 km WNW of Uto, Japan. Since the mainshock, the USGS has recorded 7 aftershocks in this area. Aftershock activity is expected to continue for days to weeks as stresses on surrounding faults redistribute.
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
130.3704°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 4.3 earthquake near Amakusa, Japan?
The magnitude 4.3 earthquake that struck 16 km E of Amakusa, Japan on August 8, 2026 at 23:02 UTC had a depth of 10.0 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 4.3 earthquakes can continue for several days and gradually diminish over time.
Is this the same earthquake as the M5.0 one earlier?
No. This magnitude 4.3 earthquake is an aftershock of the larger magnitude 5.0 mainshock that occurred earlier 2 km WNW of Uto, Japan. Aftershocks are smaller earthquakes triggered by stress changes from the mainshock.
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Understanding This Data
Magnitude 4.3 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us6000tjbm). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, August 8, 2026). M4.3 Earthquake 16 km E of Amakusa, Japan — August 8, 2026. Retrieved August 8, 2026 from https://www.earthquaketracker.org/earthquakes/event/us6000tjbm/