M4.3 Earthquake near Ozernovskiy, Russia — 02 October 2025
A light earthquake of magnitude 4.3 was recorded near Ozernovskiy, Russia on , with an epicentre 286 km northwest of Ozernovskiy, at a focal depth of 476.5 km.
Time (UTC): 2025-10-02 10:30:30
Time (your timezone): —
Magnitude: 4.3 (light)
Focal depth: 476.5 km (deep)
Epicentre: 53.4952, 153.8490
Location: 286 km NW of Ozernovskiy, 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 4.3 earthquake radiates roughly 43 tons of TNT equivalent in seismic energy.
The USGS assigns this earthquake a significance score of 284, 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.
Where was the epicentre?
The epicentre was located at 53.4952, 153.8490 — 286 km northwest of Ozernovskiy. The closest other recorded event was a magnitude 4.1 earthquake 51 km northwest of here on 10 August 2025.
Why the 477 km depth matters
At 477 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.
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 M4.3 it falls below the magnitude 6.5 threshold that generally applies before a submarine earthquake displaces enough water to generate a damaging tsunami; its 477 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
No further earthquakes have been recorded within about 150 km of the epicentre in the seven days after this event.
4 earthquakes of magnitude 4 or above have been logged within roughly 200 km of this epicentre in our catalogue. The strongest was a magnitude 4.3 event near Ozernovskiy on 27 July 2025. This M4.3 event released a comparable amount of energy to that event.
How long aftershock sequences last, and how large they get →
Where this event sits in the record
This earthquake is part of the October 2025 worldwide record. Browse the full monthly archive to compare periods.
Nearest recorded earthquakes to this epicentre
- M4.1 earthquake near Sea of Okhotsk — (51 km NW)
- M3.9 earthquake near Ozernovskiy, Russia — (106 km SW)
- M4.3 earthquake near Ozernovskiy, Russia — (147 km SSW)
Other magnitude 4 earthquakes worldwide
- M4.2 earthquake near Bandar Abbas, Iran —
- M4.4 earthquake near Cartagena, Chile —
- M4.2 earthquake near El Arenal, Mexico —
- M4.4 earthquake near El Arenal, Mexico —
- M4.3 earthquake near Puerto Madero, Mexico —
- M4.4 earthquake near Fiji region —
- M4.5 earthquake near Abepura, Indonesia —
- M4.1 earthquake near Charlotte Amalie, U.S. Virgin Islands —
Questions about this earthquake
How strong is a magnitude 4.3 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 4.3 earthquake radiates roughly 43 tons of TNT equivalent in seismic energy.
How deep was the earthquake near Ozernovskiy?
At 477 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.
Was the M4.3 earthquake near Ozernovskiy felt?
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.
What does the USGS tsunami field mean for this event?
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 M4.3 it falls below the magnitude 6.5 threshold that generally applies before a submarine earthquake displaces enough water to generate a damaging tsunami; its 477 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.
Have there been aftershocks?
No further earthquakes have been recorded within about 150 km of the epicentre in the seven days after this event.
How often do earthquakes happen near Ozernovskiy?
4 earthquakes of magnitude 4 or above have been logged within roughly 200 km of this epicentre in our catalogue. The strongest was a magnitude 4.3 event near Ozernovskiy on 27 July 2025. This M4.3 event released a comparable amount of energy to that event.