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SeismoAtlas

M1.9 earthquake – Petersville, Alaska

A magnitude 1.9 earthquake struck in the Petersville, Alaska region at 01:34 local time (09:34 UTC) on 26 Oct 2026, at a depth of 134 km, according to USGS.

Data: USGS · updated 2026-10-29 01:19 UTC · reviewed

Magnitude
1.9micro
local magnitude (Richter) (ml)
Depth
133.8 km
Status
Reviewed
Origin time
2026-10-26 09:34:57 UTC
Local: 26 Oct 2026, 01:34:57 (America/Anchorage)
Epicentre
63.016° N, 150.926° 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. 289,600207 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 ml133.8 km63.02° N, 150.93° W–Reviewed

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 134 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

30 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 M1.9

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
4.391.9114
13.301.79
19.771.6107
69.302.396
75.941.75
76.652.2101
106.672.7128
115.142.2117
120.862.12
154.201.93
165.752.387
169.552.086
184.372.1124
192.072.3135
199.071.9119
231.262.099
240.221.9121
246.622.192
285.552.6134
298.312.0139
310.292.1120
310.612.1122
313.552.692
318.241.7107
323.181.796
332.552.2104
332.811.45
334.893.5112
382.352.3122
412.092.388
  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. 2.1Denali National Park, Alaska10-31 10:26
  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. 2.0Petersville, Alaska11-02 11:07
  19. 2.0Petersville, Alaska11-05 00:50
  20. 2.0Denali National Park, Alaska11-07 19:53
  21. 1.9Petersville, Alaska10-26 13:58
  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 aka2026vfdrxi. First recorded here 29 Oct 2026, 01:56:38 UTC. Solutions: USGS · AK (usgs:aka2026vfdrxi). Cite as: SeismoAtlas, “M1.9 earthquake – Petersville, Alaska”, https://seismoatlas.com/earthquake/aka2026vfdrxi-m1-9-earthquake-petersville-alaska, data from USGS.

JSON: /api/v1/events/aka2026vfdrxi. SeismoAtlas is not an official warning service.