Earthquake · automatic estimate, may change
M 3.2ml
35 km WSW of Skwentna, Alaska
- When
- Magnitude
- M 3.2 (ml)
- Depth
- 116 km below the surface
- Felt
- no reports yet
- Status
- Automatic — a machine’s first estimate, which may change
USGS · last changed by USGS · we first saw it 3 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 1,900 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.2 would have released about 32 times as much.
- Northridge, California 1994 M 6.7 180,000× the energy of this one
- Mineral, Virginia 2011 M 5.8 7,900× the energy of this one
- Magna, Utah 2020 M 5.7 5,600× the energy of this one
- This earthquake M 3.2 about 1,900 lb of TNT
- Around the size people start to feel M 3.0 this one released 2× 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.
For this area
The largest earthquake within 50 km since 2016 was M 4.5 on 2021-03-03 — about 89 times the energy of this one.
Before 2016, the USGS record lists 11 earthquakes of M5 or more within 50 km; the five largest:
- 6.2 22 km WSW of Skwentna, Alaska · 15 km NE of this epicentre
- 5.8 46 km SW of Skwentna, Alaska · 19 km S of this epicentre
- 5.7 47 km NW of Beluga, Alaska · 47 km SSE of this epicentre
- 5.6 31 km W of Skwentna, Alaska · 18 km N of this epicentre
- 5.6 54 km WNW of Skwentna, Alaska · 46 km NNW 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 61.8360, -151.9960. Map © OpenStreetMap contributors.
Aftershocks so far
No further earthquakes have 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.
Revisions
USGS refines a solution as more stations report. Every change we have seen is listed here.
| What changed | From | To | When |
|---|---|---|---|
| magnitude | 3.1 | 3.2 | |
| location | 34 km WSW of Skwentna, Alaska | 35 km WSW of Skwentna, Alaska | |
| longitude | -151.98 | -152 | |
| latitude | 61.85 | 61.84 | |
| depth | 121.3 | 115.6 | |
| magnitude | 2.7 | 3.1 |
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.