Earthquake · automatic estimate, may change
M 2.1ml
55 km WNW of Happy Valley, Alaska
- When
- Magnitude
- M 2.1 (ml)
- Depth
- 112 km below the surface
- Felt
- no reports yet
- Nearest
- Kenai Peninsula Borough, 37 km NNE
- Status
- Automatic — a machine’s first estimate, which may change
USGS · last changed by USGS · we first saw it 1 hour ago
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 5.1 on 2022-01-21 — about 32,000 times the energy of this one.
Before 2016, the USGS record lists 24 earthquakes of M5 or more within 50 km; the five largest:
- 6.4 75 km WNW of Ninilchik, Alaska · 26 km NNW of this epicentre
- 6.4 52 km ENE of Pedro Bay, Alaska · 36 km SW of this epicentre
- 6.2 16 km WNW of Happy Valley, Alaska · 40 km ESE of this epicentre
- 6.2 70 km E of Port Alsworth, Alaska · 21 km WNW of this epicentre
- 6.1 73 km WNW of Ninilchik, Alaska · 33 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 60.0900, -152.6920. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Kenai Peninsula Borough, AK | 37 km (23 mi) | NNE | earthquakes near Kenai Peninsula Borough |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
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 |
|---|---|---|---|
| longitude | -152.69 | -152.69 | |
| latitude | 60.09 | 60.09 | |
| depth | 112.1 | 111.6 | |
| magnitude | 2 | 2.1 | |
| location | 59 km WNW of Happy Valley, Alaska | 55 km WNW of Happy Valley, Alaska | |
| longitude | -152.77 | -152.69 | |
| latitude | 60.09 | 60.09 | |
| depth | 111.4 | 112.1 | |
| magnitude | 1.9 | 2 |
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.