Earthquake · automatic estimate, may change
M 1.9ml
Earthquake near Big Lake, AK
USGS: 6 km ENE of Big Lake, Alaska
36 km (23 mi) N of Anchorage, AK
- When
- 2:22 am AKDT on 29 September 2026 ()
- Where
- 6 km (4 mi) ENE of Big Lake, AK · earthquakes near Big Lake
- Magnitude
- M 1.9 (ml)
- Depth
- 69 km below the surface
- Felt
- no reports yet
- Nearest
- Anchorage Municipality, 51 km SE
- Nearest mapped fault
- Castle Mountain fault, 8 km from its surface trace — near is not the same as on
- Status
- Automatic — a machine’s first estimate, which may change
USGS · last changed by USGS · we first saw it 4 days ago
A magnitude 1.9 earthquake was recorded 6 km (4 mi) ENE of Big Lake, AK, at 2:22 am AKDT on 29 September 2026 (10:22 UTC). This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.
Earthquakes near other towns within 30 km: Houston, Knik-Fairview, Meadow Lakes, Wasilla, Tanaina, Willow.
How big was it?
This earthquake released about 21 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 710,000× the energy of this one
- Magna, Utah 2020 M 5.7 500,000× the energy of this one
- Around the size people start to feel M 3.0 45× the energy of this one
- This earthquake M 1.9 about 21 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 63,000,000 times the energy of this one.
Before 2016, the USGS record lists 21 earthquakes of M5 or more within 50 km; the five largest:
- 5.9 23 km NE of Willow, Alaska · 41 km N of this epicentre
- 5.6 11 km NW of Big Lake, Alaska · 15 km WNW of this epicentre
- 5.6 5 km N of Susitna, Alaska · 36 km W of this epicentre
- 5.5 2 km ENE of Eagle River, Alaska · 29 km SE of this epicentre
- 5.5 9 km E of Susitna, Alaska · 26 km W 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 61.5440, -149.8460. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Anchorage Municipality, AK | 51 km (32 mi) | SE | earthquakes near Anchorage Municipality |
| Matanuska-Susitna Borough, AK | 82 km (51 mi) | NNE | earthquakes near Matanuska-Susitna Borough |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
5 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 NW of Houston, Alaska
- 2.5 7 km WSW of Willow, Alaska
- 1.1 12 km W of Fishhook, 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 |
|---|---|---|---|
| longitude | -149.85 | -149.85 | |
| latitude | 61.55 | 61.54 | |
| depth | 64.9 | 69 | |
| magnitude | 1.8 | 1.9 |
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.