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SeismoAtlas

M2.0 earthquake – Petersville, Alaska

A magnitude 2.0 earthquake struck in the Petersville, Alaska region at 16:56 local time (00:56 UTC) on 17 Oct 2026, at a depth of 129 km, according to USGS.

Data: USGS · updated 2026-10-18 06:29 UTC · reviewed

Magnitude
2.0micro
local magnitude (Richter) (ml)
Depth
129.1 km
Status
Reviewed
Origin time
2026-10-18 00:56:26 UTC
Local: 17 Oct 2026, 16:56:26 (America/Anchorage)
Epicentre
62.987° N, 151.146° 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 Survey2.0 ml129.1 km62.99° N, 151.15° W–Reviewed

How big was it?

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

It released roughly the energy of 15 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 129 km this was a intermediate-depth earthquake, which spreads shaking over a wider area but less intensely.

M2.0 releases about 32× the energy of M1.0, and its waves are about 10× taller on a seismogram. Energy: 15 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

38 later earthquakes within 30 km; the largest was M3.5 3 days ago. 10 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M2.0

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
3.811.8131
9.901.9100
25.971.785
32.781.5107
36.982.1113
44.881.990
46.103.1106
46.442.8118
71.302.1124
130.921.892
148.892.4106
160.312.1127
181.782.1132
190.121.55
200.641.9134
205.031.9114
220.421.6107
220.992.04
269.942.396
276.581.75
307.312.7128
315.782.2117
321.502.12
354.841.93
370.192.086
385.012.1124
431.902.099
440.861.9121
447.262.192
486.192.6134
508.782.4137
510.932.1120
511.262.1122
518.881.7107
533.192.2104
533.451.45
535.543.5112
565.112.61
  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. 2.6Denali National Park, Alaska11-10 14:03
  7. 2.4Petersville, Alaska10-24 05:50
  8. 2.4Petersville, Alaska11-08 05:43
  9. 2.3Petersville, Alaska10-29 06:52
  10. 2.2Denali National Park, Alaska10-31 04:43
  11. 2.2Petersville, Alaska11-09 06:08
  12. 2.1Petersville, Alaska10-19 13:55
  13. 2.1Denali National Park, Alaska10-21 00:14
  14. 2.1Petersville, Alaska10-24 17:14
  15. 2.1Denali National Park, Alaska10-25 14:43
  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. 1.9Petersville, Alaska10-18 10:50
  25. 1.9143 km NNW of Meadow Lakes, Alaska, United States10-19 21:48

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 aka2026upsftn. First recorded here 18 Oct 2026, 06:31:56 UTC. Solutions: USGS · AK (usgs:aka2026upsftn). Cite as: SeismoAtlas, “M2.0 earthquake – Petersville, Alaska”, https://seismoatlas.com/earthquake/aka2026upsftn-m2-0-earthquake-petersville-alaska, data from USGS.

JSON: /api/v1/events/aka2026upsftn. SeismoAtlas is not an official warning service.