Earthquake · automatic estimate, may change
M 2.1ml
30 km NNW of Eureka Roadhouse, Alaska
Yes. A magnitude 2.1 earthquake was recorded 30 km NNW of Eureka Roadhouse, Alaska, at 5:42 pm AKDT on 18 October 2025 (01:42 UTC), 27 km deep. The magnitude and location are an automatic first estimate and may change.
- When
- Magnitude
- M 2.1 (ml)
- Depth
- 27 km below the surface
- Felt
- no reports yet
- Nearest
- Matanuska-Susitna Borough, 115 km W
- Status
- Automatic — a machine’s first estimate, which may change
USGS · last changed by USGS · we first saw it 391 days ago
This was a minor earthquake. Quakes this small are rarely felt and do not cause 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 43 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 350,000× the energy of this one
- Magna, Utah 2020 M 5.7 250,000× the energy of this one
- Around the size people start to feel M 3.0 22× the energy of this one
- This earthquake M 2.1 about 43 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 4.8 on 2022-10-06 — about 11,000 times the energy of this one.
Before 2016, the USGS record lists 5 earthquakes of M5 or more within 50 km:
- 5.9 15 km N of Glacier View, Alaska · 36 km SW of this epicentre
- 5.3 40 km WNW of Lake Louise, Alaska · 19 km N of this epicentre
- 5.3 55 km NNE of Chickaloon, Alaska · 45 km W of this epicentre
- 5.1 9 km ESE of Eureka Roadhouse, Alaska · 37 km SSE of this epicentre
- 5.0 59 km NW of Eureka Roadhouse, Alaska · 36 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 62.2028, -147.2865. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Matanuska-Susitna Borough, AK | 115 km (72 mi) | W | earthquakes near Matanuska-Susitna Borough |
| Anchorage Municipality, AK | 155 km (97 mi) | SW | earthquakes near Anchorage Municipality |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
56 earthquakes have been recorded within 50 km since this one.
- 1.7 20 km NNW of Glacier View, Alaska
- 2.1 27 km NW of Eureka Roadhouse, Alaska
- 1.7 45 km NW of Eureka Roadhouse, Alaska
- 1.5 18 km NNW of Eureka Roadhouse, Alaska
- 1.7 17 km W of Eureka Roadhouse, Alaska
- 2.7 17 km SE of Eureka Roadhouse, Alaska
- 2.0 20 km NW of Eureka Roadhouse, Alaska
- 1.8 68 km WNW of Lake Louise, Alaska
- 1.8 17 km NW of Eureka Roadhouse, Alaska
- 2.0 28 km NNW of Glacier View, Alaska
- 2.1 14 km WSW of Eureka Roadhouse, Alaska
- 2.2 8 km WNW of Glacier View, Alaska
- 1.6 5 km WNW of Eureka Roadhouse, Alaska
- 1.5 11 km NNE of Eureka Roadhouse, Alaska
- 1.6 5 km N of Eureka Roadhouse, 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.