Japan earthquakes

M3.9 earthquake 104 km E of Yamada, Japan

A magnitude 3.9 earthquake struck 104 km E of Yamada, Japan on Thu, Sep 6, 1973, 3:52 AM JST (18:52 UTC), 31 km (19 mi) below the surface.

A larger quake followed: M4.0 97 km E of Yamada, Japan. This one was a foreshock.

Yamada forecastMore 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
3.9 (mb), minor
Local time
UTC
1973-09-05 18:52:00 UTC
Depth
31.0 km (19.3 mi), shallow
Epicenter
39.488° N, 143.161° 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.

Stations used
11

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 19 in the 60 days after this one and 6 in the 30 days before it.

After

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp00003be. Read Tue, Sep 22, 2026, 9:58 AM UTC.