M3.2 earthquake 48 km WNW of Anchorage, Alaska, United States

A magnitude 3.2 earthquake struck 48 km WNW of Anchorage, Alaska, United States at 02:50 local time (10:50 UTC) on 23 Sept 2026, at a depth of 58 km, according to USGS.

2 reports to USGS “Did You Feel It?”

Data: USGS · updated 2026-10-07 21:36 UTC · reviewed

Magnitude: 3.2minor
local magnitude (Richter) (ml)
Depth: 57.6 km
Status: Reviewed
Origin time: 2026-09-23 10:50:05 UTC; Local: 23 Sept 2026, 02:50:05 (America/Anchorage)
Epicentre: 61.383° N, 150.732° 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
Place	Distance	Est. shaking
AnchorageAlaska, United States · pop. 289,600	48 km	INot felt
Knik-FairviewAlaska, United States · pop. 14,923	62 km	INot felt
Eagle RiverAlaska, United States · pop. 24,793	62 km	INot 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.

Agency	Magnitude	Depth	Epicentre	Time offset	Status
USGS · AKheadlineAlaska Earthquake Center via U.S. Geological Survey	3.2 ml	57.6 km	61.38° N, 150.73° W	–	Reviewed · 1 revision

How big was it?

Often felt by people at rest close to the epicentre, rarely causes damage.

It released roughly the energy of 951 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 58 km this was a shallow earthquake, which is felt more strongly at the surface than a deeper one of the same size.

Compare M3.2 with M2.2

M3.2 releases about 32× the energy of M2.2, and its waves are about 10× taller on a seismogram. Energy: 951 kg of TNT vs 30 kg of TNT.

Each square is the energy of one M2.2. Energy from log₁₀E = 1.5M + 4.8.

Aftershocks and nearby activity

17 later earthquakes within 30 km; the largest was M2.9 10 days ago. 1 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M3.2

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

Aftershocks
Time after mainshock (hours)	Magnitude	Depth (km)
58.02	1.8	18
68.61	1.8	18
85.72	2.1	53
88.80	2.9	50
110.29	2.0	66
117.21	1.3	17
118.66	2.5	53
130.54	2.7	57
137.79	1.7	58
140.54	1.8	46
174.58	2.4	49
204.26	2.1	64
276.45	2.1	5
321.87	1.6	64
322.73	1.7	59
323.08	2.3	61
340.66	1.7	59

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.

USGS “Did You Feel It?” has 2 reports: add yours at USGS.

Event id aka2026swhmgk. First recorded here 28 Sept 2026, 17:32:10 UTC. Solutions: USGS · AK (usgs:aka2026swhmgk). Cite as: SeismoAtlas, “M3.2 earthquake 48 km WNW of Anchorage, Alaska, United States”, https://seismoatlas.com/earthquake/aka2026swhmgk-m3-2-earthquake-48-km-wnw-of-anchorage-alaska-united-states, data from USGS.

JSON: /api/v1/events/aka2026swhmgk. SeismoAtlas is not an official warning service.