M3.6 Earthquake near Rat Islands, Aleutian Islands, Alaska — 10 August 2026
A minor earthquake of magnitude 3.6 was recorded near Rat Islands, Aleutian Islands, Alaska on , at a focal depth of 26.5 km.
Time (UTC): 2026-08-10 18:09:28
Time (your timezone): —
Magnitude: 3.6 (minor)
Focal depth: 26.5 km (shallow)
Epicentre: 50.1020, 177.5280
Location: Rat Islands, Aleutian Islands, Alaska
USGS link to NOAA tsunami information: Not linked
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 3.6 earthquake radiates roughly 3.8 tons of TNT equivalent in seismic energy.
The USGS assigns this earthquake a significance score of 199, 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 50.1020, 177.5280. The closest other recorded event was a magnitude 3.7 earthquake 33 km north-northeast of here on 13 July 2026.
Why the 26 km depth matters
At 26 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 may be noticed locally, especially close to the epicentre. 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 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 M3.6 it falls below the magnitude 6.5 threshold that generally applies before a submarine earthquake displaces enough water to generate a damaging tsunami; 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 5 hours since this event.
141 earthquakes of magnitude 4 or above have been logged within roughly 200 km of this epicentre in our catalogue. The strongest was a magnitude 5.9 event near Attu Station on 15 January 2026. This M3.6 event released about 2,818 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 August 2026 worldwide record. Browse the full monthly archive to compare periods.
Nearest recorded earthquakes to this epicentre
- M3.7 earthquake near Rat Islands, Aleutian Islands, Alaska — (33 km NNE)
- M3.0 earthquake near Rat Islands, Aleutian Islands, Alaska — (50 km NW)
- M3.6 earthquake near Rat Islands, Aleutian Islands, Alaska — (60 km ENE)
- M3.3 earthquake near Rat Islands, Aleutian Islands, Alaska — (67 km ENE)
- M3.9 earthquake near Rat Islands, Aleutian Islands, Alaska — (110 km N)
- M4.8 earthquake near Rat Islands, Aleutian Islands, Alaska — (121 km NE)
- M4.6 earthquake near Rat Islands, Aleutian Islands, Alaska — (123 km NE)
- M3.3 earthquake near Rat Islands, Aleutian Islands, Alaska — (129 km NNE)
- M2.5 earthquake near Rat Islands, Aleutian Islands, Alaska — (130 km NE)
- M3.7 earthquake near Rat Islands, Aleutian Islands, Alaska — (131 km NNE)
Other magnitude 3 earthquakes worldwide
- M3.7 earthquake near Elmo, Utah —
- M3.5 earthquake near Estacion Coahuila, B.C., MX —
- M3.4 earthquake near Naalehu, Hawaii —
- M3.4 earthquake near Elim, Alaska —
- M3.9 earthquake near Naalehu, Hawaii —
- M3.5 earthquake near San Antonio, Puerto Rico —
- M3.7 earthquake near Charlotte Amalie, U.S. Virgin Islands —
- M3.8 earthquake near Cruz Bay, U.S. Virgin Islands —
Questions about this earthquake
How strong is a magnitude 3.6 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 3.6 earthquake radiates roughly 3.8 tons of TNT equivalent in seismic energy.
How deep was the earthquake near Rat Islands, Aleutian Islands?
At 26 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 M3.6 earthquake near Rat Islands, Aleutian Islands 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 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 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 M3.6 it falls below the magnitude 6.5 threshold that generally applies before a submarine earthquake displaces enough water to generate a damaging tsunami; 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 5 hours since this event.
How often do earthquakes happen near Rat Islands, Aleutian Islands?
141 earthquakes of magnitude 4 or above have been logged within roughly 200 km of this epicentre in our catalogue. The strongest was a magnitude 5.9 event near Attu Station on 15 January 2026. This M3.6 event released about 2,818 times less energy than that event.