M-0.4 earthquake 81 km W of Kalifornsky, Alaska, United States
A magnitude -0.4 earthquake struck 81 km W of Kalifornsky, Alaska, United States at 17:32 local time (01:32 UTC) on 29 Sept 2026, at a depth of 6 km, according to USGS.
Data: USGS · updated 2026-09-30 22:12 UTC · reviewed
- Magnitude
- -0.4micro
local magnitude (Richter) (ml) - Depth
- 6 km
- Status
- Reviewed
- Origin time
- 2026-09-30 01:32:52 UTC
- Local: 29 Sept 2026, 17:32:52 (America/Anchorage)
- Epicentre
- 60.494° N, 152.765° W
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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 | 81 km | INot felt |
| KenaiAlaska, United States · pop. 7,661 | 83 km | INot felt |
| AnchorageAlaska, United States · pop. 289,600 | 175 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 | -0.4 ml | 6 km | 60.49° N, 152.76° W | – | Reviewed |
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How big was it?
Usually not felt. Recorded by nearby seismometers; thousands occur worldwide every day.
It released roughly the energy of 4 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 6 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 117× the energy of M-0.4, and its waves are about 24× taller on a seismogram. Energy: 477 g of TNT vs 4 g of TNT.
Each square is the energy of one M-0.4. Energy from log₁₀E = 1.5M + 4.8.
Aftershocks and nearby activity
10 later earthquakes within 30 km; the largest was M1.9 1 day ago. 14 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.
Mainshock M-0.4
10 later earthquakes nearby. Aftershock rates typically fall off roughly as 1/time (Omori's law).
| Time after mainshock (hours) | Magnitude | Depth (km) |
|---|---|---|
| 1.23 | -0.5 | 2 |
| 15.71 | -0.8 | 0 |
| 24.85 | 1.3 | 97 |
| 30.16 | 1.9 | 132 |
| 37.38 | -0.9 | 2 |
| 43.38 | -0.7 | 3 |
| 49.13 | 0.0 | 3 |
| 50.62 | -0.9 | 3 |
| 52.92 | 0.5 | 4 |
| 69.62 | 1.3 | 131 |
- 1.993 km W of Kalifornsky, Alaska, United States10-01 07:42
- 1.372 km WSW of Kalifornsky, Alaska, United States10-01 02:23
- 1.379 km WNW of Kenai, Alaska, United States10-02 23:10
- 0.585 km W of Kalifornsky, Alaska, United States10-02 06:28
- 0.080 km W of Kenai, Alaska, United States10-02 02:40
- -0.581 km W of Kalifornsky, Alaska, United States09-30 02:46
- -0.778 km W of Kalifornsky, Alaska, United States10-01 20:55
- -0.882 km W of Kalifornsky, Alaska, United States09-30 17:15
- -0.983 km W of Kalifornsky, Alaska, United States10-01 14:55
- -0.980 km W of Kalifornsky, Alaska, United States10-02 04:10
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.
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Event id av93067569. First recorded here 30 Sept 2026, 22:12:41 UTC. Solutions: USGS · AV (usgs:av93067569). Cite as: SeismoAtlas, “M-0.4 earthquake 81 km W of Kalifornsky, Alaska, United States”, https://seismoatlas.com/earthquake/av93067569-m-0-4-earthquake-81-km-w-of-kalifornsky-alaska-united-states, data from USGS.
JSON: /api/v1/events/av93067569. SeismoAtlas is not an official warning service.