Earthquake · automatic estimate, may change
M 2.1ml
Earthquake near Cohoe, AK
USGS: 20 km W of Cohoe, Alaska
- When
- 10:15 am AKDT on 29 September 2026 ()
- Where
- 20 km (13 mi) W of Cohoe, AK · earthquakes near Cohoe
- Magnitude
- M 2.1 (ml)
- Depth
- 71 km below the surface
- Felt
- 1 report · strongest reported intensity I
- Nearest
- Kenai Peninsula Borough, 35 km W
- Nearest mapped fault
- Middle Ground Shoal anticline (Cook Inlet folds), 15 km from its surface trace — near is not the same as on
- Status
- Automatic — a machine’s first estimate, which may change
USGS · last changed by USGS · we first saw it 3 days ago
A magnitude 2.1 earthquake was recorded 20 km (13 mi) W of Cohoe, AK, at 10:15 am AKDT on 29 September 2026 (18:15 UTC). 1 person has reported feeling it to USGS. This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.
Earthquakes near other towns within 30 km: Kalifornsky.
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 2017-05-07 — about 63,000 times the energy of this one.
Before 2016, the USGS record lists 8 earthquakes of M5 or more within 50 km; the five largest:
- 6.7 6 km WNW of Nikiski, Alaska · 41 km NNE of this epicentre
- 6.2 16 km WNW of Happy Valley, Alaska · 45 km SSW of this epicentre
- 5.8 23 km WNW of Happy Valley, Alaska · 47 km SSW of this epicentre
- 5.5 13 km NW of Happy Valley, Alaska · 41 km SSW of this epicentre
- 5.5 39 km WNW of Ninilchik, Alaska · 46 km SW 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 60.3740, -151.6770. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Kenai Peninsula Borough, AK | 35 km (22 mi) | W | earthquakes near Kenai Peninsula Borough |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
2 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 |
|---|---|---|---|
| reported intensity | not reported | 1 | |
| felt reports | not reported | 1 | |
| location | 25 km W of Cohoe, Alaska | 20 km W of Cohoe, Alaska | |
| longitude | -151.77 | -151.68 | |
| latitude | 60.38 | 60.37 | |
| depth | 77.2 | 70.6 |
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.