Japan earthquakes

M4.6 earthquake 117 km N of Naze, Japan

A magnitude 4.6 earthquake struck 117 km N of Naze, Japan on Mon, Mar 23, 1981, 3:19 PM JST (06:19 UTC), 33 km (21 mi) below the surface.

A larger quake followed: M5.0 108 km N of Naze, Japan. This one was a foreshock.

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The earthquake

Magnitude: 4.6 (mb), light
Local time: Mon, Mar 23, 1981, 3:19 PM JST
UTC: 1981-03-23 06:19:41 UTC
Depth: 33.0 km (20.5 mi), shallow
Epicenter: 29.424° N, 129.573° 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: OPERATOR_ASSIGNED

Nearest places

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

Nearby

Within 100 km, magnitude 1.6 and up: 2 in the 60 days after this one and 14 in the 30 days before it.

After

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp0001cub (also filed as iscgemsup630282). Read Mon, Sep 28, 2026, 9:57 PM UTC.