Russia earthquakes

M6.6 earthquake 151 km SE of Kuril’sk, Russia

A magnitude 6.6 earthquake struck 151 km SE of Kuril’sk, Russia on Thu, Mar 23, 1978, 6:34 AM JST (21:34 UTC), 33 km (21 mi) below the surface.

A larger quake followed: M7.5 55 km SE of Kuril’sk, Russia. This one was a foreshock.

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Map

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

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The earthquake

Magnitude: 6.6 (ms), strong
Local time: Thu, Mar 23, 1978, 6:34 AM JST
UTC: 1978-03-22 21:34:33 UTC
Depth: 33.0 km (20.5 mi), shallow
Epicenter: 44.140° N, 149.029° E
Region: Russia
Strongest shaking: IV, light 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: IV, light shaking
Peak ground acceleration: 2.5% of gravity
Peak ground velocity: 1.3 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: OPERATOR_ASSIGNED
Stations used: 307

Nearest places

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

Nearby

Within 100 km, magnitude 2.5 and up: 200 in the 60 days after this one and 0 in the 30 days before it.

After

The first 60 of 200.

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp0000thy (also filed as gcmtc032278b, gcmt19780322213433, iscgem685303). Read Tue, Sep 22, 2026, 9:41 AM UTC.