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M4.2 Earthquake near Ozernovskiy, Russia — 09 August 2025

A light earthquake of magnitude 4.2 was recorded near Ozernovskiy, Russia on , with an epicentre 102 km east-southeast of Ozernovskiy, at a focal depth of 59.3 km. It ranked as the 686th strongest of 723 earthquakes recorded in Russia in the preceding 30 days.

4.2 Light

Time (UTC): 2025-08-09 13:47:05

Time (your timezone): —

Magnitude: 4.2 (light)

Focal depth: 59.3 km (shallow)

Epicentre: 51.0835, 157.8230

Location: 102 km ESE of Ozernovskiy, 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 4.2 earthquake radiates roughly 30 tons of TNT equivalent in seismic energy.

The USGS assigns this earthquake a significance score of 271, 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 00:18 local solar time at the epicentre, in the early hours of the morning.

This event was deeper than 81% of the 1,906 earthquakes recorded in Russia in our catalogue and stronger than 5% of them.

Where was the epicentre?

The epicentre was located at 51.0835, 157.8230 — 102 km east-southeast of Ozernovskiy. The closest other recorded event was a magnitude 4.3 earthquake 24 km southwest of here on 16 June 2026.

The nearest other settlements in our records are Petropavlovsk-Kamchatsky (184 km northeast), Paratunka (186 km north) and Severo-Kuril’sk (254 km south-southwest).

Why the 59 km depth matters

At 59 km this was a shallow earthquake. Shallow events release their energy close to the surface, so for a given magnitude they produce noticeably stronger shaking — and more damage — than deeper ones. Roughly three quarters of all earthquakes worldwide occur at shallow depths.

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 shallow focus makes stronger surface shaking more likely than for a deeper event of the same magnitude.

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 M4.2 it falls below the magnitude 6.5 threshold that generally applies before a submarine earthquake displaces enough water to generate a damaging tsunami; 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

31 further earthquakes have been recorded within about 150 km of the epicentre in the seven days after this event, the largest of them magnitude 5.3.

825 earthquakes of magnitude 4 or above have been logged within roughly 200 km of this epicentre in our catalogue. The strongest was a magnitude 7.0 event near Severo-Kuril’sk on 03 August 2025. This M4.2 event released about 15,849 times less energy than that event.

98 earthquakes have been recorded within 100 km of this epicentre in the past year, 97 of them in the past 30 days.

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

Where this event sits in the record

This earthquake is part of the August 2025 worldwide record, and of earthquakes in Russia during August 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 Ozernovskiy?

It measured magnitude 4.2 — a light earthquake. A magnitude 4.2 earthquake radiates roughly 30 tons of TNT equivalent in seismic energy.

How deep was the earthquake near Ozernovskiy?

The focus was 59 km below the surface, which counts as shallow.

Was the Ozernovskiy earthquake felt at the surface?

At magnitude 4.2 and a focal depth of 59 km, shaking would have been concentrated near the epicentre.

When did the earthquake near Ozernovskiy happen?

09 August 2025 at 13:47 UTC.

Was there a tsunami?

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

Have there been aftershocks?

31 further earthquakes have been recorded within about 150 km of the epicentre in the seven days after this event, the largest of them magnitude 5.3.

How often do earthquakes happen near Ozernovskiy?

825 earthquakes of magnitude 4 or above have been logged within roughly 200 km of this epicentre in our catalogue. The strongest was a magnitude 7.0 event near Severo-Kuril’sk on 03 August 2025. This M4.2 event released about 15,849 times less energy than that event.