Earthquake.now

M4.1 Earthquake near Kuril’sk, Russia — 27 March 2025

A light earthquake of magnitude 4.1 was recorded near Kuril’sk, Russia on , with an epicentre 170 km north of Kuril’sk, at a focal depth of 325.6 km. It ranked as the 14th strongest of 17 earthquakes recorded in Russia in the preceding 30 days.

4.1 Light

Time (UTC): 2025-03-27 18:12:38

Time (your timezone): —

Magnitude: 4.1 (light)

Focal depth: 325.6 km (deep)

Epicentre: 46.7515, 147.6530

Location: 170 km N of Kuril’sk, Russia

Country: Russia

USGS link to NOAA tsunami information: Not linked

Review status: Reviewed

Source: USGS event page

How strong was this earthquake?

Light earthquakes are widely felt near the epicentre and can rattle windows, dishes and hanging objects. Damage is uncommon and usually limited to cracked plaster or fallen loose items.

A magnitude 4.1 earthquake radiates roughly 21 tons of TNT equivalent in seismic energy.

The USGS assigns this earthquake a significance score of 259, which is below the USGS threshold of more than 600 for its significant-earthquake list. The ranking combines magnitude with available Did You Feel It responses and PAGER alert level; it is not a direct measurement of damage.

What the magnitude scale actually measures →

When it happened locally

That is about 04:03 local solar time at the epicentre, in the early hours of the morning.

This event was deeper than 99% of the 1,906 earthquakes recorded in Russia in our catalogue and stronger than 2% of them.

Where was the epicentre?

The epicentre was located at 46.7515, 147.6530 — 170 km north of Kuril’sk. The closest other recorded event was a magnitude 4.2 earthquake 48 km southwest of here on 29 August 2026.

The nearest other settlements in our records are Makarov (173 km northwest) and Poronaysk (185 km north-northwest).

Why the 326 km depth matters

At 326 km this was a deep-focus earthquake, occurring well inside the subducting slab rather than in the crust. Deep events are rarely damaging even at large magnitudes, though they can be felt over very long distances.

This catalogue does not ingest eyewitness responses, so it cannot confirm where this earthquake was felt. Based on magnitude alone, an event this size is often felt across the surrounding area. Its deep focus normally weakens surface shaking while spreading perceptible motion over a broad area.

Read more on how focal depth changes what you feel →

What does the tsunami information flag mean?

The USGS record does not carry a link to NOAA tsunami information. That field is not an all-clear and does not state whether a tsunami occurred. In this case, a damaging tsunami would be less likely because at M4.1 it falls below the magnitude 6.5 threshold that generally applies before a submarine earthquake displaces enough water to generate a damaging tsunami; its 326 km focal depth is too great to deform the sea floor significantly; it occurred inland rather than beneath the sea floor. For an active coastal alert, use tsunami.gov or your local warning authority.

How earthquakes generate tsunamis, and what the alert levels mean →

Aftershocks and local seismic history

1 further earthquakes have been recorded within about 150 km of the epicentre in the seven days after this event, the largest of them magnitude 4.9.

20 earthquakes of magnitude 4 or above have been logged within roughly 200 km of this epicentre in our catalogue. The strongest was a magnitude 5.6 event near Kuril’sk on 12 January 2026. This M4.1 event released about 178 times less energy than that event.

No other earthquakes have been recorded within 100 km of this epicentre in the past year, which makes this a genuinely isolated event.

How long aftershock sequences last, and how large they get →

Where this event sits in the record

This earthquake is part of the March 2025 worldwide record, and of earthquakes in Russia during March 2025. Browse the full monthly archive to compare periods.

Nearest recorded earthquakes to this epicentre

Other recent earthquakes in Russia

All recorded earthquakes in Russia →

Other magnitude 4 earthquakes worldwide

All magnitude 4 earthquakes →

Questions about this earthquake

How strong was the earthquake near Kuril’sk?

It measured magnitude 4.1 — a light earthquake. A magnitude 4.1 earthquake radiates roughly 21 tons of TNT equivalent in seismic energy.

How deep was the earthquake near Kuril’sk?

The focus was 326 km below the surface, which counts as deep.

Was the Kuril’sk earthquake felt at the surface?

At magnitude 4.1 and a focal depth of 326 km, the depth spreads the energy out, so shaking is weaker overhead but reaches further.

When did the earthquake near Kuril’sk happen?

27 March 2025 at 18:12 UTC.

Was there a tsunami?

No. The USGS record carries no tsunami-information link for this event.

Have there been aftershocks?

1 further earthquakes have been recorded within about 150 km of the epicentre in the seven days after this event, the largest of them magnitude 4.9.

How often do earthquakes happen near Kuril’sk?

20 earthquakes of magnitude 4 or above have been logged within roughly 200 km of this epicentre in our catalogue. The strongest was a magnitude 5.6 event near Kuril’sk on 12 January 2026. This M4.1 event released about 178 times less energy than that event.