M-0.9 earthquake 79 km W of Kalifornsky, Alaska, United States
A magnitude -0.9 earthquake struck 79 km W of Kalifornsky, Alaska, United States at 15:50 local time (23:50 UTC) on 4 Oct 2026, at a depth of 2 km, according to USGS.
Data: USGS · updated 2026-10-06 17:48 UTC · reviewed
- Magnitude
- -0.9micro
local magnitude (Richter) (ml) - Depth
- 1.7 km
- Status
- Reviewed
- Origin time
- 2026-10-04 23:50:55 UTC
- Local: 4 Oct 2026, 15:50:55 (America/Anchorage)
- Epicentre
- 60.492° N, 152.730° W
Advertisement
Circles show this event and others within 30 km from 7 days before to 30 days after. Lines: plate boundaries and GEM active faults. Open on the live map
Nearby places
| Place | Distance | Est. shaking |
|---|---|---|
| KalifornskyAlaska, United States · pop. 7,850 | 79 km | INot felt |
| KenaiAlaska, United States · pop. 7,661 | 81 km | INot felt |
| AnchorageAlaska, United States · pop. 289,600 | 173 km | INot felt |
Shaking is an estimate from the intensity prediction equation of Allen, Wald & Worden (2012), not an observation. Local ground and buildings can change it by a level or more.
Every agency's solution
Agencies locate earthquakes with their own stations and methods, so their numbers differ. We match reports of the same event by time, distance and magnitude and show them side by side. The headline uses USGS · AV, which has been reviewed by an analyst.
| Agency | Magnitude | Depth | Epicentre | Time offset | Status |
|---|---|---|---|---|---|
| USGS · AVheadlineAlaska Volcano Observatory via U.S. Geological Survey | -0.9 ml | 1.7 km | 60.49° N, 152.73° W | – | Reviewed |
Advertisement
How big was it?
Usually not felt. Recorded by nearby seismometers; thousands occur worldwide every day.
It released roughly the energy of 1 g of TNT. Magnitude is logarithmic: each whole step means about 32 times more energy and 10 times larger waves on a seismogram. Depth matters too: at 2 km this was a shallow earthquake, which is felt more strongly at the surface than a deeper one of the same size.
M1.0 releases about 759× the energy of M-0.9, and its waves are about 83× taller on a seismogram. Energy: 477 g of TNT vs 1 g of TNT.
Each square is the energy of one M-0.9. Energy from log₁₀E = 1.5M + 4.8.
Aftershocks and nearby activity
7 later earthquakes within 30 km; the largest was M2.1 16 h ago. 21 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.
Mainshock M-0.9
7 later earthquakes nearby. Aftershock rates typically fall off roughly as 1/time (Omori's law).
| Time after mainshock (hours) | Magnitude | Depth (km) |
|---|---|---|
| 29.71 | -0.5 | 14 |
| 30.60 | -0.7 | -2 |
| 31.29 | 0.6 | 42 |
| 33.91 | 2.1 | 110 |
| 35.35 | 0.9 | 97 |
| 37.89 | 1.1 | 89 |
| 42.61 | -0.8 | -2 |
- 2.153 km WNW of Kalifornsky, Alaska, United States10-06 09:45
- 1.160 km W of Kenai, Alaska, United States10-06 13:44
- 0.965 km W of Kalifornsky, Alaska, United States10-06 11:12
- 0.682 km W of Kalifornsky, Alaska, United States10-06 07:08
- -0.580 km W of Kalifornsky, Alaska, United States10-06 05:33
- -0.782 km W of Kalifornsky, Alaska, United States10-06 06:26
- -0.878 km W of Kalifornsky, Alaska, United States10-06 18:27
Did you feel it?
Reports from people help show where shaking was strong. They are anonymous and shown here in aggregate.
Reports on SeismoAtlas
No reports yet.
Advertisement
Event id av94460651. First recorded here 6 Oct 2026, 18:32:37 UTC. Solutions: USGS · AV (usgs:av94460651). Cite as: SeismoAtlas, “M-0.9 earthquake 79 km W of Kalifornsky, Alaska, United States”, https://seismoatlas.com/earthquake/av94460651-m-0-9-earthquake-79-km-w-of-kalifornsky-alaska-united-states, data from USGS.
JSON: /api/v1/events/av94460651. SeismoAtlas is not an official warning service.