M5.4 Earthquake near Dutch Harbor, Alaska — 27 July 2025
A moderate earthquake of magnitude 5.4 was recorded near Dutch Harbor, Alaska on , with an epicentre 10 km north-northeast of Dutch Harbor, at a focal depth of 88.9 km.
Time (UTC): 2025-07-27 22:47:05
Time (your timezone): —
Magnitude: 5.4 (moderate)
Focal depth: 88.9 km (intermediate)
Epicentre: 53.9743, -166.4800
Location: 10 km NNE of Dutch Harbor, Alaska
USGS link to NOAA tsunami information: Available
Review status: Reviewed
Source: USGS event page
How strong was this earthquake?
Moderate earthquakes can damage poorly built or unreinforced structures near the epicentre, while well-engineered buildings typically escape serious harm. Shaking is often strong enough to wake sleeping residents over a wide area.
A magnitude 5.4 earthquake radiates roughly 1,898 tons of TNT equivalent in seismic energy.
The USGS assigns this earthquake a significance score of 460, 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 53.9743, -166.4800 — 10 km north-northeast of Dutch Harbor. The closest other recorded event was a magnitude -0.4 earthquake 9 km west-southwest of here on 30 July 2026.
Why the 89 km depth matters
At 89 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 can be felt widely and may cause minor local damage. 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
28 further earthquakes have been recorded within about 150 km of the epicentre in the seven days after this event, the largest of them magnitude 3.6.
35 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 Unalaska on 26 January 2025. This M5.4 event released about 2.0 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
- M-0.4 earthquake near Dutch Harbor, Alaska — (9 km WSW)
- M-0.1 earthquake near Dutch Harbor, Alaska — (9 km WSW)
- M0.7 earthquake near Dutch Harbor, Alaska — (13 km SW)
- M0.4 earthquake near Dutch Harbor, Alaska — (13 km SW)
- M0.9 earthquake near Dutch Harbor, Alaska — (13 km SW)
- M0.5 earthquake near Dutch Harbor, Alaska — (14 km SW)
- M0.6 earthquake near Dutch Harbor, Alaska — (14 km SW)
- M0.6 earthquake near Dutch Harbor, Alaska — (14 km WSW)
- M0.1 earthquake near Dutch Harbor, Alaska — (14 km WSW)
- M0.2 earthquake near Dutch Harbor, Alaska — (14 km SW)
Other magnitude 5 earthquakes worldwide
- M5.2 earthquake near Severo-Kuril’sk, Russia —
- M5.2 earthquake near Severo-Kuril’sk, Russia —
- M5.2 earthquake near Tsunō, Japan —
- M5.6 earthquake near Port McNeill, Canada —
- M5.5 earthquake near Mutsu, Japan —
- M5.2 earthquake near Masohi, Indonesia —
- M5.2 earthquake near El Arenal, Mexico —
- M5.6 earthquake near San Fernando, Peru —
Questions about this earthquake
How strong is a magnitude 5.4 earthquake?
Moderate earthquakes can damage poorly built or unreinforced structures near the epicentre, while well-engineered buildings typically escape serious harm. Shaking is often strong enough to wake sleeping residents over a wide area. A magnitude 5.4 earthquake radiates roughly 1,898 tons of TNT equivalent in seismic energy.
How deep was the earthquake near Dutch Harbor?
At 89 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 M5.4 earthquake near Dutch Harbor 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 can be felt widely and may cause minor local damage. 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?
28 further earthquakes have been recorded within about 150 km of the epicentre in the seven days after this event, the largest of them magnitude 3.6.
How often do earthquakes happen near Dutch Harbor?
35 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 Unalaska on 26 January 2025. This M5.4 event released about 2.0 times less energy than that event.