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SeismoAtlas

M2.5 earthquake – Petersville, Alaska

A magnitude 2.5 earthquake struck in the Petersville, Alaska region at 02:07 local time (10:07 UTC) on 17 Oct 2026, at a depth of 111 km, according to USGS. The solution is preliminary and may be revised.

revised from M2.1

Data: USGS · updated 2026-10-17 10:11 UTC · automatic solution

Magnitude
2.5micro
local magnitude (Richter) (ml)
revised from 2.1
Depth
111.4 km
Status
Automatic
Origin time
2026-10-17 10:07:45 UTC
Local: 17 Oct 2026, 02:07:45 (America/Anchorage)
Epicentre
62.924° N, 150.815° 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. 289,600195 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.

AgencyMagnitudeDepthEpicentreTime offsetStatus
USGS · AKheadlineAlaska Earthquake Center via U.S. Geological Survey2.5 mlwas 2.3111.4 km62.92° N, 150.81° W–Automatic · 4 revisions

How big was it?

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

It released roughly the energy of 85 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 111 km this was a intermediate-depth earthquake, which spreads shaking over a wider area but less intensely.

M2.5 releases about 32× the energy of M1.5, and its waves are about 10× taller on a seismogram. Energy: 85 kg of TNT vs 3 kg of TNT.

Each square is the energy of one M1.5. Energy from log₁₀E = 1.5M + 4.8.

Aftershocks and nearby activity

40 later earthquakes within 30 km; the largest was M3.5 3 days ago. 11 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M2.5

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
14.812.0129
18.621.8131
24.711.9100
40.781.785
47.591.5107
51.792.1113
59.691.990
60.913.1106
61.252.8118
85.401.7117
86.112.1124
106.382.5115
145.731.892
163.712.4106
175.122.1127
210.541.8120
215.451.9134
219.841.9114
228.751.79
235.231.6107
256.232.094
284.752.396
292.102.2101
322.122.7128
330.602.2117
381.202.387
385.002.086
399.822.1124
446.722.099
455.671.9121
462.072.192
501.002.6134
525.742.1120
526.072.1122
529.012.692
533.691.7107
538.631.796
548.012.2104
550.353.5112
627.542.388
  1. 3.5Petersville, Alaska11-09 08:28
  2. 3.1Petersville, Alaska10-19 23:02
  3. 2.8Denali National Park, Alaska10-19 23:22
  4. 2.7Petersville, Alaska10-30 20:14
  5. 2.6Denali National Park, Alaska11-07 07:07
  6. 2.6Petersville, Alaska11-08 11:08
  7. 2.5Petersville, Alaska10-21 20:30
  8. 2.4Petersville, Alaska10-24 05:50
  9. 2.3Petersville, Alaska10-29 06:52
  10. 2.3145 km NNW of Meadow Lakes, Alaska, United States11-02 07:19
  11. 2.3Petersville, Alaska11-12 13:40
  12. 2.2Petersville, Alaska10-29 14:13
  13. 2.2Denali National Park, Alaska10-31 04:43
  14. 2.2Petersville, Alaska11-09 06:08
  15. 2.1Petersville, Alaska10-19 13:55
  16. 2.1Denali National Park, Alaska10-21 00:14
  17. 2.1Petersville, Alaska10-24 17:14
  18. 2.1Petersville, Alaska11-03 01:56
  19. 2.1Petersville, Alaska11-05 16:12
  20. 2.1Denali National Park, Alaska11-08 07:52
  21. 2.1Denali National Park, Alaska11-08 08:11
  22. 2.0Petersville, Alaska10-18 00:56
  23. 2.0147 km NNW of Meadow Lakes, Alaska, United States10-28 02:21
  24. 2.0Petersville, Alaska11-02 11:07
  25. 2.0Petersville, Alaska11-05 00:50

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 aka2026uoopfk. First recorded here 17 Oct 2026, 10:09:38 UTC. Solutions: USGS · AK (usgs:aka2026uoopfk). Cite as: SeismoAtlas, “M2.5 earthquake – Petersville, Alaska”, https://seismoatlas.com/earthquake/aka2026uoopfk-m2-5-earthquake-petersville-alaska, data from USGS.

JSON: /api/v1/events/aka2026uoopfk. SeismoAtlas is not an official warning service.