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SeismoAtlas

M1.7 earthquake – Petersville, Alaska

A magnitude 1.7 earthquake struck in the Petersville, Alaska region at 14:52 local time (22:52 UTC) on 26 Oct 2026, at a depth of 9 km, according to USGS.

revised from M1.5

Data: USGS · updated 2026-10-29 21:45 UTC · reviewed

Magnitude
1.7micro
local magnitude (Richter) (ml)
revised from 1.5
Depth
8.7 km
Status
Reviewed
Origin time
2026-10-26 22:52:45 UTC
Local: 26 Oct 2026, 14:52:45 (America/Anchorage)
Epicentre
62.978° N, 150.500° 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. 289,600198 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 Survey1.7 mlwas 1.58.7 km62.98° N, 150.50° 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 5 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 9 km this was a shallow earthquake, which is felt more strongly at the surface than a deeper one of the same size.

M1.7 releases about 11× the energy of M1.0, and its waves are about 5× taller on a seismogram. Energy: 5 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

26 later earthquakes within 30 km; the largest was M3.5 3 days ago. 15 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M1.7

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
6.481.6107
25.721.9124
27.482.094
52.912.1109
56.002.396
63.352.2101
80.751.772
93.372.7128
101.852.2117
152.452.387
156.252.086
171.072.1124
178.772.3135
185.771.9119
233.322.192
272.252.6134
296.992.1120
297.322.1122
300.262.692
304.941.7107
309.881.796
319.262.2104
321.603.5112
369.052.3122
398.022.2124
398.792.388
  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, Alaska11-11 07:55
  9. 2.3Petersville, Alaska11-12 13:40
  10. 2.2Petersville, Alaska10-29 14:13
  11. 2.2Denali National Park, Alaska10-31 04:43
  12. 2.2Petersville, Alaska11-09 06:08
  13. 2.2Cantwell, Alaska11-12 12:53
  14. 2.1Cantwell, Alaska10-29 03:47
  15. 2.1Petersville, Alaska11-03 01:56
  16. 2.1Petersville, Alaska11-05 16:12
  17. 2.1Denali National Park, Alaska11-08 07:52
  18. 2.1Denali National Park, Alaska11-08 08:11
  19. 2.0147 km NNW of Meadow Lakes, Alaska, United States10-28 02:21
  20. 2.0Petersville, Alaska11-02 11:07
  21. 1.9Denali National Park, Alaska10-28 00:35
  22. 1.9Denali National Park, Alaska11-03 16:38
  23. 1.7137 km N of Meadow Lakes, Alaska, United States10-30 07:38
  24. 1.7Petersville, Alaska11-08 15:49
  25. 1.7Petersville, Alaska11-08 20:45

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 aka2026vgehqf. First recorded here 26 Oct 2026, 22:55:21 UTC. Solutions: USGS · AK (usgs:aka2026vgehqf). Cite as: SeismoAtlas, “M1.7 earthquake – Petersville, Alaska”, https://seismoatlas.com/earthquake/aka2026vgehqf-m1-7-earthquake-petersville-alaska, data from USGS.

JSON: /api/v1/events/aka2026vgehqf. SeismoAtlas is not an official warning service.