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SeismoAtlas

M1.9 earthquake – Petersville, Alaska

A magnitude 1.9 earthquake struck in the Petersville, Alaska region at 05:58 local time (13:58 UTC) on 26 Oct 2026, at a depth of 114 km, according to USGS.

revised from M1.6

Data: USGS · updated 2026-10-29 20:21 UTC · reviewed

Magnitude
1.9micro
local magnitude (Richter) (ml)
revised from 1.6
Depth
113.9 km
Status
Reviewed
Origin time
2026-10-26 13:58:16 UTC
Local: 26 Oct 2026, 05:58:16 (America/Anchorage)
Epicentre
63.013° N, 150.826° 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 Survey1.9 mlwas 1.6113.9 km63.01° N, 150.83° W–Reviewed · 2 revisions

How big was it?

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

It released roughly the energy of 11 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 114 km this was a intermediate-depth earthquake, which spreads shaking over a wider area but less intensely.

M1.9 releases about 22× the energy of M1.0, and its waves are about 7.9× taller on a seismogram. Energy: 11 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. 14 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M1.9

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
8.911.79
15.391.6107
36.392.094
61.812.1109
64.912.396
72.262.2101
102.282.7128
110.752.2117
149.811.93
161.362.387
165.162.086
179.982.1124
187.682.3135
194.681.9119
226.872.099
235.831.9121
242.232.192
281.162.6134
293.922.0139
305.902.1120
306.232.1122
309.172.692
313.851.7107
318.791.796
328.162.2104
330.513.5112
377.962.3122
407.702.388
  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. 2.1Cantwell, Alaska10-29 03:47
  14. 2.1Petersville, Alaska11-03 01:56
  15. 2.1Petersville, Alaska11-05 16:12
  16. 2.1Denali National Park, Alaska11-08 07:52
  17. 2.1Denali National Park, Alaska11-08 08:11
  18. 2.0147 km NNW of Meadow Lakes, Alaska, United States10-28 02:21
  19. 2.0Petersville, Alaska11-02 11:07
  20. 2.0Petersville, Alaska11-05 00:50
  21. 2.0Denali National Park, Alaska11-07 19:53
  22. 1.9Denali National Park, Alaska11-01 19:46
  23. 1.9Denali National Park, Alaska11-03 16:38
  24. 1.9Denali National Park, Alaska11-05 09:48
  25. 1.7Petersville, Alaska10-26 22:52

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 aka2026vfmmfp. First recorded here 26 Oct 2026, 14:00:58 UTC. Solutions: USGS · AK (usgs:aka2026vfmmfp). Cite as: SeismoAtlas, “M1.9 earthquake – Petersville, Alaska”, https://seismoatlas.com/earthquake/aka2026vfmmfp-m1-9-earthquake-petersville-alaska, data from USGS.

JSON: /api/v1/events/aka2026vfmmfp. SeismoAtlas is not an official warning service.