Earthquake · automatic estimate, may change
M 2.8ml
59 km ESE of King Salmon, Alaska
Yes. A magnitude 2.8 earthquake was recorded 59 km ESE of King Salmon, Alaska at 00:13 UTC on 2026-10-20, 158 km deep. No felt reports to USGS yet. The magnitude and location are an automatic first estimate and may change.
- When
- Magnitude
- M 2.8 (ml)
- Depth
- 158 km below the surface
- Felt
- no reports yet
- Nearest
- Lake and Peninsula Borough, 52 km SW
- Status
- Automatic — a machine’s first estimate, which may change
USGS · last changed by USGS · we first saw it 20 hours ago
This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.
At this magnitude and depth it was probably too small to be felt, even directly above it. 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 480 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.8 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 32,000× the energy of this one
- Magna, Utah 2020 M 5.7 22,000× the energy of this one
- Around the size people start to feel M 3.0 2× the energy of this one
- This earthquake M 2.8 about 480 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 5.2 on 2019-01-22 — about 4,000 times the energy of this one.
Before 2016, the USGS record lists 48 earthquakes of M5 or more within 50 km; the five largest:
- 7.0 Event 36 Novarupta-Mount Katmai area, Alaska Peninsula · 47 km ESE of this epicentre
- 6.8 Event 37 Novarupta-Mount Katmai area, Alaska Peninsula · 47 km ESE of this epicentre
- 6.8 Event 48 Novarupta-Mount Katmai area, Alaska Peninsula · 38 km ESE of this epicentre
- 6.6 Event 39 Novarupta-Mount Katmai area, Alaska Peninsula · 47 km ESE of this epicentre
- 6.6 19 km SSE of King Salmon, Alaska · 47 km WNW 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 58.4280, -155.7600. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Lake and Peninsula Borough, AK | 52 km (32 mi) | SW | earthquakes near Lake and Peninsula Borough |
| Bristol Bay Borough, AK | 79 km (49 mi) | WNW | earthquakes near Bristol Bay Borough |
| Kodiak Island Borough, AK | 135 km (84 mi) | SE | earthquakes near Kodiak Island Borough |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
No further earthquakes have been recorded within 50 km since this one.
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.
Revisions
USGS refines a solution as more stations report. Every change we have seen is listed here.
| What changed | From | To | When |
|---|---|---|---|
| location | 60 km ESE of King Salmon, Alaska | 59 km ESE of King Salmon, Alaska | |
| longitude | -155.74 | -155.76 | |
| latitude | 58.43 | 58.43 | |
| depth | 157.3 | 158.2 | |
| magnitude | 2.3 | 2.8 | |
| location | 58 km ESE of King Salmon, Alaska | 60 km ESE of King Salmon, Alaska | |
| longitude | -155.79 | -155.74 | |
| latitude | 58.43 | 58.43 | |
| depth | 155 | 157.3 | |
| magnitude | 1.7 | 2.3 |
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.