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M3.9 Earthquake near Pedro Bay, United States — 27 July 2025, 13:09 UTC

A minor earthquake of magnitude 3.9 was recorded near Pedro Bay, United States on , with an epicentre 53 km east-southeast of Pedro Bay, at a focal depth of 106.4 km. It ranked as the 83rd strongest of 8051 earthquakes recorded in the United States in the preceding 30 days.

3.9 Minor

Time (UTC): 2025-07-27 13:09:23

Time (your timezone): —

Magnitude: 3.9 (minor)

Focal depth: 106.4 km (intermediate)

Epicentre: 59.5826, -153.2460

Location: 53 km ESE of Pedro Bay, Alaska

Country: United States

USGS link to NOAA tsunami information: Available

Review status: Reviewed

Source: USGS event page

How strong was this earthquake?

Minor earthquakes in this range are felt by people close to the epicentre as a brief jolt or rattle, but they very rarely cause any damage.

A magnitude 3.9 earthquake radiates roughly 11 tons of TNT equivalent in seismic energy.

The USGS assigns this earthquake a significance score of 234, 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 02:56 local solar time at the epicentre, in the early hours of the morning.

This event was deeper than 98% of the 157,460 earthquakes recorded in the United States in our catalogue and stronger than 99% of them.

Where was the epicentre?

The epicentre was located at 59.5826, -153.2460 — 53 km east-southeast of Pedro Bay. The closest other recorded event was a magnitude 2.8 earthquake 12 km southeast of here on 21 September 2026.

The nearest other settlements in our records are Aleneva (183 km south) and Alaska Peninsula National Wildlife Refuge (216 km south-southwest).

Why the 106 km depth matters

At 106 km this was an intermediate-depth earthquake. Energy from events at this depth spreads out before it reaches the surface, which usually means weaker shaking near the epicentre than a shallow quake of the same magnitude, but shaking felt across a wider area.

This catalogue does not ingest eyewitness responses, so it cannot confirm where this earthquake was felt. Based on magnitude alone, an event this size may be noticed locally, especially close to the epicentre. Its intermediate depth normally reduces peak shaking near the epicentre compared with a shallow event of the same magnitude.

Read more on how focal depth changes what you feel →

What does the tsunami information flag mean?

The USGS event record links to NOAA tsunami information because this was a large event in an oceanic region. That link flag does not mean a tsunami occurred or that a warning is active. Check tsunami.gov and instructions from your local authority for the current status of your coastline.

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

Aftershocks and local seismic history

105 further earthquakes have been recorded within about 150 km of the epicentre in the seven days after this event, the largest of them magnitude 2.8.

31 earthquakes of magnitude 4 or above have been logged within roughly 200 km of this epicentre in our catalogue. The strongest was a magnitude 4.9 event near Clam Gulch on 27 June 2026. This M3.9 event released about 32 times less energy than that event.

1378 earthquakes have been recorded within 100 km of this epicentre in the past year, 166 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 July 2025 worldwide record, and of earthquakes in the United States during July 2025. Browse the full monthly archive to compare periods.

Nearest recorded earthquakes to this epicentre

Other recent earthquakes in the United States

All recorded earthquakes in the United States →

Other magnitude 3 earthquakes worldwide

All magnitude 3 earthquakes →

Questions about this earthquake

How strong was the earthquake near Pedro Bay?

It measured magnitude 3.9 — a minor earthquake. A magnitude 3.9 earthquake radiates roughly 11 tons of TNT equivalent in seismic energy.

How deep was the earthquake near Pedro Bay?

The focus was 106 km below the surface, which counts as intermediate.

Was the Pedro Bay earthquake felt at the surface?

At magnitude 3.9 and a focal depth of 106 km, the depth spreads the energy out, so shaking is weaker overhead but reaches further.

When did the earthquake near Pedro Bay happen?

27 July 2025 at 13:09 UTC.

Was there a tsunami?

The USGS record carries a link to NOAA tsunami information for this event. That is not a warning: check your regional tsunami warning centre for any live alert.

Have there been aftershocks?

105 further earthquakes have been recorded within about 150 km of the epicentre in the seven days after this event, the largest of them magnitude 2.8.

How often do earthquakes happen near Pedro Bay?

31 earthquakes of magnitude 4 or above have been logged within roughly 200 km of this epicentre in our catalogue. The strongest was a magnitude 4.9 event near Clam Gulch on 27 June 2026. This M3.9 event released about 32 times less energy than that event.