Earthquake · automatic estimate, may change
M 1.8ml
Earthquake near Anchorage, AK
USGS: 19 km SW of Point MacKenzie, Alaska
20 km (13 mi) W of Anchorage, AK
- When
- 11:22 pm AKDT on 28 September 2026 ()
- Where
- 20 km (13 mi) W of Anchorage, AK · earthquakes near Anchorage
- Magnitude
- M 1.8 (ml)
- Depth
- 52 km below the surface
- Felt
- no reports yet
- Nearest
- Anchorage Municipality, 54 km E
- Status
- Automatic — a machine’s first estimate, which may change
USGS · last changed by USGS · we first saw it 4 days ago
A magnitude 1.8 earthquake was recorded 20 km (13 mi) W of Anchorage, AK, at 11:22 pm AKDT on 28 September 2026 (07:22 UTC). This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.
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 7.1 on 2018-11-30 — about 89,000,000 times the energy of this one.
Before 2016, the USGS record lists 25 earthquakes of M5 or more within 50 km; the five largest:
- 6.8 Southern Alaska · 48 km WSW of this epicentre
- 6.8 4 km NE of Beluga, Alaska · 41 km WSW of this epicentre
- 5.8 27 km N of Beluga, Alaska · 43 km WNW of this epicentre
- 5.8 20 km ENE of Beluga, Alaska · 27 km W of this epicentre
- 5.6 11 km NW of Big Lake, Alaska · 37 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 61.2510, -150.2730. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Anchorage Municipality, AK | 54 km (33 mi) | E | earthquakes near Anchorage Municipality |
| Matanuska-Susitna Borough, AK | 120 km (74 mi) | NNE | earthquakes near Matanuska-Susitna Borough |
| Kenai Peninsula Borough, AK | 148 km (92 mi) | SW | earthquakes near Kenai Peninsula Borough |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
6 earthquakes have been recorded within 50 km since this one.
- 1.6 14 km WSW of Anchorage, Alaska
- 2.1 9 km W of Point MacKenzie, Alaska
- 2.1 8 km NNE of Susitna, Alaska
- 2.0 24 km SSW of Anchorage, Alaska
- 2.4 24 km ENE of Beluga, Alaska
- 1.9 6 km ENE of Big Lake, 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.
Revisions
USGS refines a solution as more stations report. Every change we have seen is listed here.
| What changed | From | To | When |
|---|---|---|---|
| location | 20 km SW of Point MacKenzie, Alaska | 19 km SW of Point MacKenzie, Alaska | |
| longitude | -150.27 | -150.27 | |
| latitude | 61.25 | 61.25 | |
| depth | 50.4 | 51.8 |
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.