Earthquake · automatic estimate, may change
M 2.1ml
37 km N of Petersville, Alaska
- When
- Magnitude
- M 2.1 (ml)
- Depth
- 90 km below the surface
- Felt
- no reports yet
- Nearest
- Matanuska-Susitna Borough, 95 km SE
- Status
- Automatic — a machine’s first estimate, which may change
USGS · last changed by USGS · we first saw it 25 hours ago
A magnitude 2.1 earthquake was recorded 37 km N of Petersville, Alaska at 01:42 UTC on 2026-10-02. This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.
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 5.3 on 2016-05-15 — about 63,000 times the energy of this one.
Before 2016, the USGS record lists 16 earthquakes of M5 or more within 50 km; the five largest:
- 6.3 Central Alaska · 47 km SW of this epicentre
- 5.7 66 km ESE of Denali National Park, Alaska · 45 km NNE of this epicentre
- 5.5 59 km SE of Denali National Park, Alaska · 33 km N of this epicentre
- 5.4 70 km WSW of Cantwell, Alaska · 49 km NE of this epicentre
- 5.4 48 km N of Petersville, Alaska · 17 km NE 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 62.8300, -150.8930. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Matanuska-Susitna Borough, AK | 95 km (59 mi) | SE | earthquakes near Matanuska-Susitna Borough |
| Denali Borough, AK | 104 km (65 mi) | NNE | earthquakes near Denali Borough |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
3 earthquakes have been recorded within 50 km since this one.
- 2.2 60 km ESE of Denali National Park, Alaska
- 1.5 60 km SSE of Denali National Park, Alaska
- 1.7 30 km WNW of Petersville, 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 | -150.91 | -150.89 | |
| latitude | 62.83 | 62.83 | |
| magnitude | 2 | 2.1 |
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.