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United States · Alaska

M3.9 Earthquake near Matanuska-Susitna Borough, Alaska (United States)

UTC time: 2026-09-12 06:38:26 UTC Local time: —
Magnitude
M3.9
Depth
69.4 km
Source
USGS

Alaska · Matanuska-Susitna Borough

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About this earthquake

A magnitude M3.9 earthquake was recorded near Matanuska-Susitna Borough, Alaska (United States) on September 12, 2026 at 06:38 UTC. The hypocenter lay relatively close to the surface at around 69 km, increasing how strongly it was felt. Shaking of this size is frequently noticed but usually harmless.

The event was recorded by USGS. United States: 249 earthquakes were recorded in the past 24 hours, the strongest reaching M5.4.

Depth profile

Depth profile Depth: 69.4 km (Shallow) Surface Shallow Intermediate Deep 0 km 70 km 300 km 700 km 69.4 km
Shallow
69.4 km
69.4 km — deeper than the regional average (15.2 km)
Regional average: 15.2 km
Why depth matters

Shallow quakes release energy near the surface — shaking is felt more strongly and damage potential is higher.

Depth classes per USGS

Volcanoes nearby

  • Buzzard Creek
    Distance: 140 km ·Tuff ring(s) ·Elevation: 830 m ·Last eruption: -1050 ·United States
  • Hayes
    Distance: 219 km ·Stratovolcano ·Elevation: 3'034 m ·Last eruption: 1200 ·United States
  • Spurr
    Distance: 239 km ·Stratovolcano ·Elevation: 3'374 m ·Last eruption: 1992 ·United States
  • Wrangell
    Distance: 274 km ·Shield ·Elevation: 4'278 m ·Last eruption: 1912 ·United States
  • Redoubt
    Distance: 326 km ·Stratovolcano ·Elevation: 3'108 m ·Last eruption: 2009 ·United States
  • Iliamna
    Distance: 379 km ·Stratovolcano ·Elevation: 3'053 m ·Last eruption: 1876 ·United States

Alaska

Context for this earthquake

12 Sep 2025 – 12 Sep 2026 · M ≥ 3.0 · 660 Catalogue entries

Sufficiently reliable matching data are not currently available for a direct comparison. The area profile shows the available records and their limitations.

Open seismic profile

Historic earthquake map · United States

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