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SeismoAtlas

M1.5 earthquake – Petersville, Alaska

A magnitude 1.5 earthquake struck in the Petersville, Alaska region at 01:43 local time (09:43 UTC) on 19 Oct 2026, at a depth of 107 km, according to USGS.

Data: USGS · updated 2026-10-22 02:44 UTC · reviewed

Magnitude
1.5micro
local magnitude (Richter) (ml)
Depth
106.6 km
Status
Reviewed
Origin time
2026-10-19 09:43:23 UTC
Local: 19 Oct 2026, 01:43:23 (America/Anchorage)
Epicentre
62.977° N, 150.984° 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. 289,600203 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 Survey1.5 ml106.6 km62.98° N, 150.98° W–Reviewed

How big was it?

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

It released roughly the energy of 3 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 107 km this was a intermediate-depth earthquake, which spreads shaking over a wider area but less intensely.

M1.5 releases about 5.6× the energy of M1.0, and its waves are about 3.2× taller on a seismogram. Energy: 3 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

43 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 M1.5

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
4.202.1113
12.091.990
13.313.1106
13.652.8118
37.811.7117
38.522.1124
58.782.5115
98.141.892
116.112.4106
127.522.1127
148.992.1132
157.331.55
162.951.8120
167.861.9134
172.251.9114
181.161.79
187.631.6107
237.162.396
243.791.75
244.502.2101
274.522.7128
283.002.2117
288.722.12
322.061.93
333.612.387
337.412.086
352.222.1124
366.931.9119
399.122.099
408.081.9121
414.482.192
453.412.6134
476.002.4137
478.152.1120
478.472.1122
481.412.692
486.101.7107
491.041.796
500.412.2104
500.671.45
502.753.5112
532.332.61
579.952.388
  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. 2.6Denali National Park, Alaska11-10 14:03
  8. 2.5Petersville, Alaska10-21 20:30
  9. 2.4Petersville, Alaska10-24 05:50
  10. 2.4Petersville, Alaska11-08 05:43
  11. 2.3Petersville, Alaska10-29 06:52
  12. 2.3145 km NNW of Meadow Lakes, Alaska, United States11-02 07:19
  13. 2.3Petersville, Alaska11-12 13:40
  14. 2.2Petersville, Alaska10-29 14:13
  15. 2.2Denali National Park, Alaska10-31 04:43
  16. 2.2Petersville, Alaska11-09 06:08
  17. 2.1Petersville, Alaska10-19 13:55
  18. 2.1Denali National Park, Alaska10-21 00:14
  19. 2.1Petersville, Alaska10-24 17:14
  20. 2.1Denali National Park, Alaska10-25 14:43
  21. 2.1Denali National Park, Alaska10-31 10:26
  22. 2.1Petersville, Alaska11-03 01:56
  23. 2.1Petersville, Alaska11-05 16:12
  24. 2.1Denali National Park, Alaska11-08 07:52
  25. 2.1Denali National Park, Alaska11-08 08:11

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 aka2026usfvfk. First recorded here 22 Oct 2026, 02:56:13 UTC. Solutions: USGS · AK (usgs:aka2026usfvfk). Cite as: SeismoAtlas, “M1.5 earthquake – Petersville, Alaska”, https://seismoatlas.com/earthquake/aka2026usfvfk-m1-5-earthquake-petersville-alaska, data from USGS.

JSON: /api/v1/events/aka2026usfvfk. SeismoAtlas is not an official warning service.