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SeismoAtlas

M2.1 earthquake – Denali National Park, Alaska

A magnitude 2.1 earthquake struck in the Denali National Park, Alaska region at 16:14 local time (00:14 UTC) on 20 Oct 2026, at a depth of 124 km, according to USGS.

Data: USGS · updated 2026-10-23 17:24 UTC · reviewed

Magnitude
2.1micro
local magnitude (Richter) (ml)
Depth
123.7 km
Status
Reviewed
Origin time
2026-10-21 00:14:37 UTC
Local: 20 Oct 2026, 16:14:37 (America/Anchorage)
Epicentre
63.086° N, 151.008° 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. 289,600215 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 Survey2.1 ml123.7 km63.09° N, 151.01° W–Reviewed · 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 124 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

39 later earthquakes within 30 km; the largest was M3.5 3 days ago. 13 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M2.1

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
20.262.5115
59.621.892
76.812.8123
77.592.4106
89.002.1127
110.472.1132
118.811.55
124.431.8120
129.341.9134
133.731.9114
142.641.79
149.111.6107
149.692.04
198.632.396
205.271.75
205.982.2101
236.002.7128
244.482.2117
250.202.12
283.541.93
298.892.086
313.702.1124
321.412.3133
321.412.3135
328.401.9119
360.602.099
369.561.9121
375.962.192
414.892.6134
427.652.0139
431.961.82
439.632.1120
439.952.1122
447.581.7107
461.892.2104
462.151.45
464.233.5112
493.812.61
511.692.3122
  1. 3.5Petersville, Alaska11-09 08:28
  2. 2.8Denali National Park, Alaska10-24 05:03
  3. 2.7Petersville, Alaska10-30 20:14
  4. 2.6Denali National Park, Alaska11-07 07:07
  5. 2.6Denali National Park, Alaska11-10 14:03
  6. 2.5Petersville, Alaska10-21 20:30
  7. 2.4Petersville, Alaska10-24 05:50
  8. 2.3Petersville, Alaska10-29 06:52
  9. 2.3Denali National Park, Alaska11-03 09:38
  10. 2.3Denali National Park, Alaska11-03 09:38
  11. 2.3Denali National Park, Alaska11-11 07:55
  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, Alaska10-24 17:14
  16. 2.1Denali National Park, Alaska10-25 14:43
  17. 2.1Denali National Park, Alaska10-31 10:26
  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. 2.0Denali National Park, Alaska10-27 05:55
  23. 2.0Petersville, Alaska11-02 11:07
  24. 2.0Petersville, Alaska11-05 00:50
  25. 2.0Denali National Park, Alaska11-07 19:53

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 aka2026uvexfa. First recorded here 21 Oct 2026, 00:17:13 UTC. Solutions: USGS · AK (usgs:aka2026uvexfa). Cite as: SeismoAtlas, “M2.1 earthquake – Denali National Park, Alaska”, https://seismoatlas.com/earthquake/aka2026uvexfa-m2-1-earthquake-denali-national-park-alaska, data from USGS.

JSON: /api/v1/events/aka2026uvexfa. SeismoAtlas is not an official warning service.