Japan earthquakes

M5.5 earthquake 107 km SSE of Shimoda, Japan

A magnitude 5.5 earthquake struck 107 km SSE of Shimoda, Japan on Tue, Dec 28, 1982, 10:52 AM JST (01:52 UTC), 20 km (12 mi) below the surface.

A larger quake followed: M6.3 104 km SSE of Shimoda, Japan. This one was a foreshock.

Shimoda forecast More in Japan

Map

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

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The earthquake

Magnitude: 5.5 (ms), moderate
Local time: Tue, Dec 28, 1982, 10:52 AM JST
UTC: 1982-12-28 01:52:31 UTC
Depth: 20.0 km (12.4 mi), shallow
Epicenter: 33.790° N, 139.413° E
Region: Japan
Strongest shaking: V, moderate shaking
Tsunami flag: No
Status: Reviewed by a seismologist

Shaking

The USGS ShakeMap: shaking estimated from seismic stations and the quake’s size, on the Modified Mercalli intensity scale.

Strongest estimated: V, moderate shaking
Peak ground acceleration: 9.7% of gravity
Peak ground velocity: 1.5 cm/s
Map: Automatic

USGS ShakeMap: estimated shaking intensity around the epicenter — Estimated shaking intensity. Map: USGS ShakeMap.

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 2.5 and up: 18 in the 60 days after this one and 6 in the 30 days before it.

After

Before

Earthquakes today Japan earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp0001rtc (also filed as gcmtb122882a, gcmt19821228015231, iscgem587743). Read Tue, Sep 22, 2026, 5:16 PM UTC.