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SeismoAtlas

M2.1 earthquake – Petersville, Alaska

A magnitude 2.1 earthquake struck in the Petersville, Alaska region at 09:14 local time (17:14 UTC) on 24 Oct 2026, at a depth of 127 km, according to USGS. The solution is preliminary and may be revised.

revised from M2.0

Data: USGS · updated 2026-10-24 17:17 UTC · automatic solution

Magnitude
2.1micro
local magnitude (Richter) (ml)
revised from 2.0
Depth
126.8 km
Status
Automatic
Origin time
2026-10-24 17:14:45 UTC
Local: 24 Oct 2026, 09:14:45 (America/Anchorage)
Epicentre
63.083° N, 150.833° 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. 289,600213 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 Survey2.1 mlwas 2.0126.8 km63.08° N, 150.83° W–Automatic · 1 revision

How big was it?

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

It released roughly the energy of 21 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 127 km this was a intermediate-depth earthquake, which spreads shaking over a wider area but less intensely.

M2.1 releases about 32× the energy of M1.1, and its waves are about 10× taller on a seismogram. Energy: 21 kg of TNT vs 674 g of TNT.

Each square is the energy of one M1.1. Energy from log₁₀E = 1.5M + 4.8.

Aftershocks and nearby activity

38 later earthquakes within 30 km; the largest was M3.5 3 days ago. 16 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M2.1

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
21.472.1132
29.811.55
35.431.8120
40.341.9134
44.731.9114
53.631.79
60.111.6107
60.682.04
79.351.9124
106.542.1109
109.632.396
116.271.75
116.982.2101
147.002.7128
155.482.2117
161.192.12
194.531.93
209.892.086
224.702.1124
232.402.3133
232.402.3135
239.401.9119
271.602.099
280.561.9121
286.962.192
325.882.6134
338.652.0139
350.622.1120
350.952.1122
353.892.692
358.581.7107
363.521.796
369.221.64
372.892.2104
375.233.5112
422.692.3122
451.652.2124
452.432.388
  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. 2.3Denali National Park, Alaska11-03 09:38
  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. 2.1Denali National Park, Alaska10-25 14:43
  15. 2.1Cantwell, Alaska10-29 03:47
  16. 2.1Denali National Park, Alaska10-31 10:26
  17. 2.1Petersville, Alaska11-03 01:56
  18. 2.1Petersville, Alaska11-05 16:12
  19. 2.1Denali National Park, Alaska11-08 07:52
  20. 2.1Denali National Park, Alaska11-08 08:11
  21. 2.0Denali National Park, Alaska10-27 05:55
  22. 2.0Petersville, Alaska11-02 11:07
  23. 2.0Petersville, Alaska11-05 00:50
  24. 2.0Denali National Park, Alaska11-07 19:53
  25. 1.9Petersville, Alaska10-26 09:34

Did you feel it?

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Reports close 14 days after an earthquake.

Reports on SeismoAtlas

No reports yet.

Event id aka2026vcazks. First recorded here 24 Oct 2026, 17:18:01 UTC. Solutions: USGS · AK (usgs:aka2026vcazks). Cite as: SeismoAtlas, “M2.1 earthquake – Petersville, Alaska”, https://seismoatlas.com/earthquake/aka2026vcazks-m2-1-earthquake-petersville-alaska, data from USGS.

JSON: /api/v1/events/aka2026vcazks. SeismoAtlas is not an official warning service.