M3.0 Earthquake near Koyukuk, Alaska — 18 February 2026
A minor earthquake of magnitude 3.0 was recorded near Koyukuk, Alaska on , with an epicentre 24 km east-northeast of Koyukuk, at a focal depth of 128.0 km.
Time (UTC): 2026-02-18 18:34:48
Time (your timezone): —
Magnitude: 3.0 (minor)
Focal depth: 128.0 km (intermediate)
Epicentre: 64.9290, -157.2020
Location: 24 km ENE of Koyukuk, Alaska
USGS link to NOAA tsunami information: Not linked
Review status: Automatic
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 3.0 earthquake radiates roughly 477 kg of TNT equivalent in seismic energy.
The USGS assigns this earthquake a significance score of 138, 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 64.9290, -157.2020 — 24 km east-northeast of Koyukuk. The closest other recorded event was a magnitude 3.0 earthquake 45 km south-southeast of here on 18 December 2024.
Why the 128 km depth matters
At 128 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 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 M3.0 it falls below the magnitude 6.5 threshold that generally applies before a submarine earthquake displaces enough water to generate a damaging tsunami; its 128 km focal depth is too great to deform the sea floor significantly; 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 seven days after this event.
1 earthquakes of magnitude 4 or above have been logged within roughly 200 km of this epicentre in our catalogue. The strongest was a magnitude 4.7 event near Ruby on 19 May 2026. This M3.0 event released about 355 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 February 2026 worldwide record. Browse the full monthly archive to compare periods.
Nearest recorded earthquakes to this epicentre
- M3.0 earthquake near Yukon Flats National Wildlife Refuge, United States — (45 km SSE)
- M1.6 earthquake near Huslia, Alaska — (50 km N)
- M4.7 earthquake near Ruby, Alaska — (51 km ESE)
- M1.5 earthquake near Nulato, Alaska — (51 km SSW)
- M1.3 earthquake near Ruby, Alaska — (66 km ESE)
- M1.8 earthquake near Kaltag, Alaska — (75 km SW)
- M2.6 earthquake near Kaltag, Alaska — (90 km SW)
- M2.4 earthquake near Huslia, Alaska — (109 km NNE)
- M1.2 earthquake near Huslia, Alaska — (140 km N)
- M2.9 earthquake near Huslia, Alaska — (140 km N)
Other magnitude 3 earthquakes worldwide
- M3.1 earthquake near Charlotte Amalie, U.S. Virgin Islands —
- M3.0 earthquake near Charlotte Amalie, U.S. Virgin Islands —
- M2.8 earthquake near Wilkerson, CA —
- M3.0 earthquake near Charlotte Amalie, U.S. Virgin Islands —
- M2.7 earthquake near Point Possession, Alaska —
- M2.8 earthquake near Cloverdale, CA —
- M2.7 earthquake near Garden City, Texas —
- M3.3 earthquake near Suárez, Puerto Rico —
Questions about this earthquake
How strong is a magnitude 3.0 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 3.0 earthquake radiates roughly 477 kg of TNT equivalent in seismic energy.
How deep was the earthquake near Koyukuk?
At 128 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 M3.0 earthquake near Koyukuk 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 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 M3.0 it falls below the magnitude 6.5 threshold that generally applies before a submarine earthquake displaces enough water to generate a damaging tsunami; its 128 km focal depth is too great to deform the sea floor significantly; 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 seven days after this event.
How often do earthquakes happen near Koyukuk?
1 earthquakes of magnitude 4 or above have been logged within roughly 200 km of this epicentre in our catalogue. The strongest was a magnitude 4.7 event near Ruby on 19 May 2026. This M3.0 event released about 355 times less energy than that event.