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SeismoAtlas

M2.5 earthquake 97 km WSW of Kalifornsky, Alaska, United States

A magnitude 2.5 earthquake struck 97 km WSW of Kalifornsky, Alaska, United States at 01:09 local time (09:09 UTC) on 20 Sept 2026, at a depth of 139 km, according to USGS.

Data: USGS · updated 2026-09-25 18:14 UTC · reviewed

Magnitude
2.5micro
local magnitude (Richter) (ml)
Depth
138.8 km
Status
Reviewed
Origin time
2026-09-20 09:09:19 UTC
Local: 20 Sept 2026, 01:09:19 (America/Anchorage)
Epicentre
60.208° N, 152.992° 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
KalifornskyAlaska, United States · pop. 7,85097 kmINot felt
HomerAlaska, United States · pop. 5,515102 kmINot felt
AnchorageAlaska, United States · pop. 289,600202 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 Survey2.5 ml138.8 km60.21° N, 152.99° W–Reviewed

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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 139 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

44 later earthquakes within 30 km; the largest was M2.6 1 day ago. 1 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M2.5

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
34.84-1.1-2
40.03-0.32
42.60-0.3-1
44.31-0.26
50.291.492
54.68-0.6-2
55.410.22
56.26-0.80
56.98-0.20
57.130.9100
60.34-0.50
62.15-0.72
63.361.9136
64.62-0.30
68.061.790
81.45-0.6-1
82.092.1135
84.401.6142
88.841.5126
91.01-0.4-3
92.49-0.52
94.32-0.35
94.71-0.8-2
97.46-0.6-1
97.790.65
100.50-1.10
101.15-0.61
102.900.45
104.180.06
105.230.315
108.37-0.43
109.73-0.52
112.77-0.36
113.31-0.91
128.001.7115
138.352.3134
141.340.1-2
144.572.3118
174.641.7119
175.812.6128
183.24-0.70
185.512.095
188.30-0.43
203.610.64
  1. 2.687 km WNW of Homer, Alaska, United States09-27 16:58
  2. 2.392 km WNW of Homer, Alaska, United States09-26 03:30
  3. 2.378 km WSW of Kalifornsky, Alaska, United States09-26 09:43
  4. 2.1100 km WNW of Homer, Alaska, United States09-23 19:14
  5. 2.074 km WSW of Kalifornsky, Alaska, United States09-28 02:39
  6. 1.9101 km WNW of Homer, Alaska, United States09-23 00:30
  7. 1.774 km NW of Homer, Alaska, United States09-23 05:13
  8. 1.782 km W of Kalifornsky, Alaska, United States09-25 17:09
  9. 1.783 km NW of Homer, Alaska, United States09-27 15:47
  10. 1.6102 km W of Kalifornsky, Alaska, United States09-23 21:33
  11. 1.5101 km WNW of Homer, Alaska, United States09-24 02:00
  12. 1.475 km WNW of Homer, Alaska, United States09-22 11:26
  13. 0.976 km WSW of Kalifornsky, Alaska, United States09-22 18:17
  14. 0.6112 km WNW of Homer, Alaska, United States09-24 10:56
  15. 0.696 km WNW of Homer, Alaska, United States09-28 20:45
  16. 0.496 km WNW of Homer, Alaska, United States09-24 16:03
  17. 0.3111 km WNW of Homer, Alaska, United States09-24 18:23
  18. 0.293 km WNW of Homer, Alaska, United States09-22 16:33
  19. 0.196 km WNW of Homer, Alaska, United States09-26 06:29
  20. 0.088 km WNW of Homer, Alaska, United States09-24 17:20
  21. -0.2102 km WNW of Homer, Alaska, United States09-22 05:27
  22. -0.296 km WNW of Homer, Alaska, United States09-22 18:07
  23. -0.399 km WNW of Homer, Alaska, United States09-22 01:11
  24. -0.396 km WNW of Homer, Alaska, United States09-22 03:45
  25. -0.394 km WNW of Homer, Alaska, United States09-25 01:55

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Reports on SeismoAtlas

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Event id aka2026sqqbej. First recorded here 28 Sept 2026, 17:32:10 UTC. Solutions: USGS · AK (usgs:aka2026sqqbej). Cite as: SeismoAtlas, “M2.5 earthquake 97 km WSW of Kalifornsky, Alaska, United States”, https://seismoatlas.com/earthquake/aka2026sqqbej-m2-5-earthquake-97-km-wsw-of-kalifornsky-alaska-united-states, data from USGS.

JSON: /api/v1/events/aka2026sqqbej. SeismoAtlas is not an official warning service.