Earthquake · reviewed by a seismologist
M 3.9ml
65 km SE of Cantwell, Alaska
- When
- Magnitude
- M 3.9 (ml)
- Depth
- 52 km below the surface
- Felt
- no reports yet
- Measured shaking
- intensity III (ShakeMap)
- Nearest
- Matanuska-Susitna Borough, 105 km SW
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 13 hours ago
This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.
How big was it?
This earthquake released about 11 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.9 would have released about 32 times as much.
- Northridge, California 1994 M 6.7 16,000× the energy of this one
- Mineral, Virginia 2011 M 5.8 710× the energy of this one
- Magna, Utah 2020 M 5.7 500× the energy of this one
- This earthquake M 3.9 about 11 tons of TNT
- Around the size people start to feel M 3.0 this one released 22× more
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.
Revisions
USGS refines a solution as more stations report. Every change we have seen is listed here.
| What changed | From | To | When |
|---|---|---|---|
| reported intensity | not reported | 1 | |
| measured intensity | 3.76 | 2.87 | |
| felt reports | not reported | 0 | |
| review status | automatic | reviewed | |
| location | 67 km SE of Cantwell, Alaska | 65 km SE of Cantwell, Alaska | |
| longitude | -148.08 | -148.09 | |
| latitude | 62.94 | 62.95 | |
| depth | 16.6 | 52.1 | |
| measured intensity | 3.77 | 3.76 | |
| measured intensity | 2.46 | 3.77 | |
| measured intensity | not reported | 2.46 | |
| longitude | -148.08 | -148.08 |
Where
Epicentre 62.9520, -148.0930. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction | |
|---|---|---|---|
| Matanuska-Susitna Borough, AK | 105 km (65 mi) | NE of here | earthquakes near Matanuska-Susitna Borough |
| Denali Borough, AK | 126 km (78 mi) | SE of here | earthquakes near Denali Borough |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
1 earthquake has 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.
For this area
The largest earthquake within 50 km in our catalogue was M 5.5 on 2021-04-08 — it released about 250 times the energy of this one.
From the QuakeIndex catalogue, built from the USGS FDSN event service.
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.