Earthquake · reviewed by a seismologist
M 1.5ml
33 km N of Aleneva, Alaska
Yes. A magnitude 1.5 earthquake was recorded 33 km N of Aleneva, Alaska, at 10:49 am AKDT on 6 September 2023 (18:49 UTC), 5.6 km deep.
- When
- Magnitude
- M 1.5 (ml)
- Depth
- 5.6 km below the surface
- Felt
- no reports yet
- Nearest
- Kodiak Island Borough, 91 km SW
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 1149 days ago
Earthquake alerts for Kodiak Station, 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 8 km (5 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 5.4 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.5 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 2,800,000× the energy of this one
- Magna, Utah 2020 M 5.7 2,000,000× the energy of this one
- Around the size people start to feel M 3.0 180× the energy of this one
- This earthquake M 1.5 about 5.4 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 4.9 on 2019-01-02 — about 130,000 times the energy of this one.
Before 2016, the USGS record lists 9 earthquakes of M5 or more within 50 km; the five largest:
- 6.8 17 km N of Ouzinkie, Alaska · 39 km SE of this epicentre
- 6.2 27 km NNE of Ouzinkie, Alaska · 46 km ESE of this epicentre
- 6.2 37 km NNW of Aleneva, Alaska · 14 km W of this epicentre
- 5.7 40 km WNW of Aleneva, Alaska · 34 km WSW of this epicentre
- 5.6 35 km N of Aleneva, Alaska · 3 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 58.3542, -152.9785. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Kodiak Island Borough, AK | 91 km (57 mi) | SW | earthquakes near Kodiak Island Borough |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
59 earthquakes have been recorded within 50 km since this one.
- 2.8 26 km NNW of Aleneva, Alaska
- 2.1 11 km NNE of Aleneva, Alaska
- 1.5 43 km NNE of Aleneva, Alaska
- 1.7 45 km NNW of Aleneva, Alaska
- 1.7 63 km NNW of Aleneva, Alaska
- 1.8 39 km N of Aleneva, Alaska
- 1.6 74 km NNW of Aleneva, Alaska
- 2.0 63 km N of Aleneva, Alaska
- 1.6 44 km NNE of Aleneva, Alaska
- 1.6 19 km NNE of Aleneva, Alaska
- 1.5 36 km NNW of Aleneva, Alaska
- 2.1 60 km N of Aleneva, Alaska
- 1.7 57 km NNE of Aleneva, Alaska
- 1.8 61 km N of Aleneva, Alaska
- 1.6 40 km NE of Aleneva, 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.