Japan earthquakes

M4.6 earthquake 121 km E of Yamada, Japan

A magnitude 4.6 earthquake struck 121 km E of Yamada, Japan on Fri, Aug 20, 1982, 6:37 PM JST (09:37 UTC), 51 km (31 mi) below the surface.

A larger quake followed: M4.9 122 km E of Yamada, Japan. This one was a foreshock.

Yamada forecast More in Japan

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The earthquake

Magnitude: 4.6 (mb), light
Local time: Fri, Aug 20, 1982, 6:37 PM JST
UTC: 1982-08-20 09:37:20 UTC
Depth: 50.5 km (31.4 mi), shallow
Epicenter: 39.541° N, 143.362° E
Region: Japan
Tsunami flag: No
Status: Reviewed by a seismologist

Did you feel it?

No one has reported feeling this quake to the USGS.

Nearest places

Distance and direction from each place to the epicenter, with its forecast.

Nearby

Within 100 km, magnitude 1.6 and up: 3 in the 60 days after this one and 13 in the 30 days before it.

After

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp0001p5g (also filed as iscgemsup594078). Read Tue, Sep 22, 2026, 9:15 AM UTC.