Japan earthquakes

M4.9 earthquake 117 km E of Yamada, Japan

A magnitude 4.9 earthquake struck 117 km E of Yamada, Japan on Sat, Aug 14, 1982, 8:39 AM JST (23:39 UTC), 29 km (18 mi) below the surface.

A larger quake followed: M5.2 138 km E of Yamada, Japan. This one was a foreshock.

Yamada forecast More in Japan

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Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude: 4.9 (mb), light
Local time: Sat, Aug 14, 1982, 8:39 AM JST
UTC: 1982-08-13 23:39:19 UTC
Depth: 29.0 km (18.0 mi), shallow
Epicenter: 39.354° N, 143.302° 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.

How well it is located

Reviewed by a seismologist.

Depth from: CONSTRAINED_BY_DEPTH_PHASES

Nearest places

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

Nearby

Within 100 km, magnitude 1.9 and up: 9 in the 60 days after this one and 8 in the 30 days before it.

After

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp0001p13 (also filed as iscgemsup593712). Read Tue, Sep 22, 2026, 8:37 AM UTC.