M3.9 Earthquake near Pedro Bay, Alaska — 27 July 2025
A minor earthquake of magnitude 3.9 was recorded near Pedro Bay, Alaska on , with an epicentre 53 km east-southeast of Pedro Bay, at a focal depth of 106.4 km.
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
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.
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 1.2 earthquake 16 km south-southwest of here on 01 August 2026.
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.
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.
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. Browse the full monthly archive to compare periods.
Nearest recorded earthquakes to this epicentre
- M1.2 earthquake near Pedro Bay, Alaska — (16 km SSW)
- M1.4 earthquake near Nanwalek, Alaska — (18 km E)
- M1.3 earthquake near Nanwalek, Alaska — (31 km SSE)
- M1.7 earthquake near Anchor Point, Alaska — (32 km ENE)
- M1.5 earthquake near Pedro Bay, Alaska — (48 km N)
- M-0.8 earthquake near Pedro Bay, Alaska — (48 km N)
- M1.6 earthquake near Pedro Bay, Alaska — (49 km NNE)
- M0.4 earthquake near Pedro Bay, Alaska — (50 km N)
- M-0.9 earthquake near Pedro Bay, Alaska — (50 km N)
- M0.1 earthquake near Pedro Bay, Alaska — (50 km N)
Other magnitude 3 earthquakes worldwide
- M4.1 earthquake near Charlotte Amalie, U.S. Virgin Islands —
- M4.0 earthquake near Charlotte Amalie, U.S. Virgin Islands —
- M4.2 earthquake near Banda Sea —
- M3.8 earthquake near Cloverdale, CA —
- M3.8 earthquake near Geyserville, California —
- M4.1 earthquake near Masohi, Indonesia —
- M4.1 earthquake near Yamada, Japan —
- M3.8 earthquake near Atka, Alaska —
Questions about this earthquake
How strong is a magnitude 3.9 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.
How deep was the earthquake near Pedro Bay?
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.
Was the M3.9 earthquake near Pedro Bay 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 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.
What does the USGS tsunami field mean for this event?
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.
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.