M5.3 Earthquake near Attu Station, Alaska — 02 April 2025
A moderate earthquake of magnitude 5.3 was recorded near Attu Station, Alaska on , with an epicentre 39 km north-northwest of Attu Station, at a focal depth of 40.0 km.
Time (UTC): 2025-04-02 16:26:39
Time (your timezone): —
Magnitude: 5.3 (moderate)
Focal depth: 40.0 km (shallow)
Epicentre: 53.1550, 172.8830
Location: 39 km NNW of Attu Station, 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 5.3 earthquake radiates roughly 1,344 tons of TNT equivalent in seismic energy.
The USGS assigns this earthquake a significance score of 432, 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 53.1550, 172.8830 — 39 km north-northwest of Attu Station. The closest other recorded event was a magnitude 5.5 earthquake 20 km north-northwest of here on 02 April 2025.
Why the 40 km depth matters
At 40 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 can be felt widely and may cause minor local damage. Its shallow focus makes stronger surface shaking more likely than for a deeper 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
No further earthquakes have been recorded within about 150 km of the epicentre in the seven days after this event.
8 earthquakes of magnitude 4 or above have been logged within roughly 200 km of this epicentre in our catalogue. The strongest was a magnitude 5.5 event near Attu Station on 02 April 2025. This M5.3 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 April 2025 worldwide record. Browse the full monthly archive to compare periods.
Nearest recorded earthquakes to this epicentre
- M5.5 earthquake near Attu Station, Alaska — (20 km NNW)
- M4.9 earthquake near Attu Station, Alaska — (33 km ESE)
- M4.2 earthquake near Attu Station, Alaska — (117 km S)
- M4.2 earthquake near Attu Station, Alaska — (154 km SE)
- M4.4 earthquake near Attu Station, Alaska — (168 km SSE)
Other magnitude 5 earthquakes worldwide
- M5.2 earthquake near Severo-Kuril’sk, Russia —
- M5.2 earthquake near Tsunō, Japan —
- M5.1 earthquake near south of the Fiji Islands —
- M5.1 earthquake near Tristan da Cunha region —
- M5.1 earthquake near Tristan da Cunha region —
- M5.1 earthquake near south of the Fiji Islands —
- M5.6 earthquake near Port McNeill, Canada —
- M5.5 earthquake near Mutsu, Japan —
Questions about this earthquake
How strong is a magnitude 5.3 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 5.3 earthquake radiates roughly 1,344 tons of TNT equivalent in seismic energy.
How deep was the earthquake near Attu Station?
At 40 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.
Was the M5.3 earthquake near Attu Station 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 shallow focus makes stronger surface shaking more likely than for a deeper 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?
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 Attu Station?
8 earthquakes of magnitude 4 or above have been logged within roughly 200 km of this epicentre in our catalogue. The strongest was a magnitude 5.5 event near Attu Station on 02 April 2025. This M5.3 event released about 2.0 times less energy than that event.