Earthquake · reviewed by a seismologist
M 1.8ml
95 km SSW of Unalaska, Alaska
Yes. A magnitude 1.8 earthquake was recorded 95 km SSW of Unalaska, Alaska, at 6:23 am AKDT on 14 May 2025 (14:23 UTC), 13 km deep.
- When
- Magnitude
- M 1.8 (ml)
- Depth
- 13 km below the surface
- Felt
- no reports yet
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 543 days ago
Earthquake alerts for Unalaska, AK
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Alerts are on for .
Not a warning. An alert comes after USGS publishes a quake, usually minutes after the shaking. For early warning use ShakeAlert, through your phone's Wireless Emergency Alerts or the MyShake app.
This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.
At this magnitude and depth, people at rest would likely notice it out to about 3 km (2 mi) from the epicentre. Estimated from magnitude, depth and distance with the intensity equation USGS Did You Feel It? uses; felt reports, where there are any, are the measurement.
How big was it?
This earthquake released about 15 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 1,000,000× the energy of this one
- Magna, Utah 2020 M 5.7 710,000× the energy of this one
- Around the size people start to feel M 3.0 63× the energy of this one
- This earthquake M 1.8 about 15 lb of TNT
Energy from the Gutenberg–Richter relation (log10E = 1.5M + 4.8), rounded to two figures; bar length is magnitude, which is already a logarithm of energy. Magnitudes of past earthquakes from the USGS catalogue.
For this area
The largest earthquake within 50 km since 2016 was M 6.2 on 2022-01-22 — about 4,000,000 times the energy of this one.
Before 2016, the USGS record lists 54 earthquakes of M5 or more within 50 km; the five largest:
- 7.8 81 km E of Nikolski, Alaska · 40 km W of this epicentre
- 6.9 80 km E of Nikolski, Alaska · 42 km WSW of this epicentre
- 6.9 67 km SW of Unalaska, Alaska · 46 km NNW of this epicentre
- 6.8 81 km ENE of Nikolski, Alaska · 43 km W of this epicentre
- 6.8 68 km SSW of Unalaska, Alaska · 28 km NNE of this epicentre
Since 2016: the QuakeIndex catalogue (US, M1.5+), built from the USGS FDSN event service. Before 2016: USGS ComCat, M5+ from 1900. Distances are between epicentres. This is the record, not a forecast.
Where
Epicentre 53.0737, -167.0715. Map © OpenStreetMap contributors.
Aftershocks so far
54 earthquakes have been recorded within 50 km since this one.
- 1.6 77 km SW of Unalaska, Alaska
- 2.7 87 km SSW of Unalaska, Alaska
- 1.9 83 km S of Unalaska, Alaska
- 2.2 93 km SSW of Unalaska, Alaska
- 1.7 85 km SW of Unalaska, Alaska
- 2.0 128 km S of Unalaska, Alaska
- 1.9 90 km SSW of Unalaska, Alaska
- 2.1 129 km ESE of Nikolski, Alaska
- 1.7 90 km SSW of Unalaska, Alaska
- 1.9 80 km SSW of Unalaska, Alaska
- 1.5 77 km SSW of Unalaska, Alaska
- 2.0 86 km SSW of Unalaska, Alaska
- 1.6 90 km E of Nikolski, Alaska
- 1.5 88 km SSW of Unalaska, Alaska
- 2.5 95 km E of Nikolski, Alaska
Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of . QuakeIndex does not forecast aftershocks. When USGS issues an operational aftershock forecast it appears on the USGS event page.
On USGS
- The official USGS event page — the source of record for every value above
- Did you feel it? Report it to USGS — reports go to USGS, not to us
- ShakeMap for this event, when USGS has produced one
QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.