Earthquake · automatic estimate, may change
M 2.6ml
118 km E of Chignik, Alaska
- When
- Magnitude
- M 2.6 (ml)
- Depth
- 18 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 57 minutes 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 240 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.6 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 63,000× the energy of this one
- Magna, Utah 2020 M 5.7 45,000× the energy of this one
- Around the size people start to feel M 3.0 4× the energy of this one
- This earthquake M 2.6 about 240 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 6.9 on 2021-10-11 — about 2,800,000 times the energy of this one.
Before 2016, the USGS record lists 12 earthquakes of M5 or more within 50 km; the five largest:
- 6.8 117 km SSE of Ugashik, Alaska · 22 km N of this epicentre
- 6.4 104 km SSE of Ugashik, Alaska · 31 km NNW of this epicentre
- 6.3 112 km E of Chignik, Alaska · 25 km SSW of this epicentre
- 6.1 132 km E of Chignik, Alaska · 26 km SSE of this epicentre
- 5.4 115 km SSE of Ugashik, Alaska · 28 km NNE 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 56.4000, -156.4990. 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 |
|---|---|---|---|
| longitude | -156.5 | -156.5 | |
| latitude | 56.4 | 56.4 | |
| depth | 18.7 | 18.2 | |
| magnitude | 2.5 | 2.6 | |
| magnitude | 2.8 | 2.5 |
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.