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SeismoAtlas

M1.6 earthquake – Petersville, Alaska

A magnitude 1.6 earthquake struck in the Petersville, Alaska region at 21:21 local time (05:21 UTC) on 26 Oct 2026, at a depth of 107 km, according to USGS.

Data: USGS · updated 2026-10-30 00:33 UTC · reviewed

Magnitude
1.6micro
local magnitude (Richter) (ml)
Depth
106.7 km
Status
Reviewed
Origin time
2026-10-27 05:21:22 UTC
Local: 26 Oct 2026, 21:21:22 (America/Anchorage)
Epicentre
63.030° N, 150.661° W

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

Distance and estimated shaking at nearby places
PlaceDistanceEst. shaking
AnchorageAlaska, United States · pop. 289,600205 kmINot 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 · AK, which has been reviewed by an analyst.

AgencyMagnitudeDepthEpicentreTime offsetStatus
USGS · AKheadlineAlaska Earthquake Center via U.S. Geological Survey1.6 ml106.7 km63.03° N, 150.66° W–Reviewed · 1 revision

How big was it?

Usually not felt. Recorded by nearby seismometers; thousands occur worldwide every day.

It released roughly the energy of 4 kg 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 107 km this was a intermediate-depth earthquake, which spreads shaking over a wider area but less intensely.

M1.6 releases about 7.9× the energy of M1.0, and its waves are about 4× taller on a seismogram. Energy: 4 kg of TNT vs 477 g of TNT.

Each square is the energy of one M1.0. Energy from log₁₀E = 1.5M + 4.8.

Aftershocks and nearby activity

28 later earthquakes within 30 km; the largest was M3.5 3 days ago. 13 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M1.6

28 later earthquakes nearby. Aftershock rates typically fall off roughly as 1/time (Omori's law).

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
19.241.9124
21.002.094
46.432.1109
49.522.396
56.872.2101
86.892.7128
95.372.2117
145.972.387
149.782.086
164.592.1124
172.292.3133
172.292.3135
179.291.9119
220.451.9121
226.852.192
265.772.6134
278.542.0139
290.512.1120
290.842.1122
293.782.692
298.471.7107
303.411.796
309.111.64
312.782.2104
315.123.5112
362.572.3122
391.542.2124
392.322.388
  1. 3.5Petersville, Alaska11-09 08:28
  2. 2.7Petersville, Alaska10-30 20:14
  3. 2.6Denali National Park, Alaska11-07 07:07
  4. 2.6Petersville, Alaska11-08 11:08
  5. 2.3Petersville, Alaska10-29 06:52
  6. 2.3145 km NNW of Meadow Lakes, Alaska, United States11-02 07:19
  7. 2.3Denali National Park, Alaska11-03 09:38
  8. 2.3Denali National Park, Alaska11-03 09:38
  9. 2.3Denali National Park, Alaska11-11 07:55
  10. 2.3Petersville, Alaska11-12 13:40
  11. 2.2Petersville, Alaska10-29 14:13
  12. 2.2Denali National Park, Alaska10-31 04:43
  13. 2.2Petersville, Alaska11-09 06:08
  14. 2.2Cantwell, Alaska11-12 12:53
  15. 2.1Cantwell, Alaska10-29 03:47
  16. 2.1Petersville, Alaska11-03 01:56
  17. 2.1Petersville, Alaska11-05 16:12
  18. 2.1Denali National Park, Alaska11-08 07:52
  19. 2.1Denali National Park, Alaska11-08 08:11
  20. 2.0147 km NNW of Meadow Lakes, Alaska, United States10-28 02:21
  21. 2.0Petersville, Alaska11-02 11:07
  22. 2.0Denali National Park, Alaska11-07 19:53
  23. 1.9Denali National Park, Alaska10-28 00:35
  24. 1.9Denali National Park, Alaska11-03 16:38
  25. 1.9Denali National Park, Alaska11-05 09:48

Did you feel it?

Reports from people help show where shaking was strong. They are anonymous and shown here in aggregate.

Reports close 14 days after an earthquake.

Reports on SeismoAtlas

No reports yet.

Event id aka2026vgrgpa. First recorded here 27 Oct 2026, 05:43:39 UTC. Solutions: USGS · AK (usgs:aka2026vgrgpa). Cite as: SeismoAtlas, “M1.6 earthquake – Petersville, Alaska”, https://seismoatlas.com/earthquake/aka2026vgrgpa-m1-6-earthquake-petersville-alaska, data from USGS.

JSON: /api/v1/events/aka2026vgrgpa. SeismoAtlas is not an official warning service.