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M4.7 Earthquake
◍ 6 km W of Onna, Japan · · updated 8/21/2026, 9:21:42 AM
Severity score
51/100
Confidence
High
Why this matters
Aftershock sequence may follow a mainshock of this size.
Key stats
Magnitude
4.7
Depth
44 km
Severity over time
Timeline
- M4.7 recorded8/21/2026, 12:01:20 AM6 km W of Onna, Japan
Sources & attribution
ScientificUSGS Earthquake Hazardsupdated 8/21/2026, 9:21:42 AM
⚠This is an informational severity score, not an official warning. Follow guidance from NWS/NOAA, FEMA (ready.gov), and local emergency management.