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United States · Alaska

M1.8 Earthquake near Lake and Peninsula Borough, Alaska (United States)

UTC time: 2026-09-21 18:14:09 UTC Local time: —
Magnitude
M1.8
Depth
139.8 km
Source
USGS

Alaska · Lake and Peninsula Borough

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About this earthquake

A magnitude M1.8 earthquake was recorded near Lake and Peninsula Borough, Alaska (United States) on September 21, 2026 at 18:14 UTC. The earthquake originated at an intermediate depth of about 140 km. Earthquakes of this small magnitude are usually barely noticeable and cause no damage.

The data is provided by USGS and cross-checked across seismological networks. United States: over the past 24 hours, QuakeMap24 logged 194 earthquakes, the strongest at M3.0.

Depth profile

Depth profile Depth: 139.8 km (Intermediate) Surface Shallow Intermediate Deep 0 km 70 km 300 km 700 km 139.8 km
Intermediate
139.8 km
139.8 km — deeper than the regional average (15.2 km)
Regional average: 15.2 km
Why depth matters

Intermediate-depth quakes are felt across a wider area but usually cause less surface damage.

Depth classes per USGS

Volcanoes nearby

  • Griggs
    Distance: 25 km ·Stratovolcano ·Elevation: 2'317 m ·Last eruption: -1790 ·United States
  • Katmai
    Distance: 34 km ·Stratovolcano ·Elevation: 2'047 m ·Last eruption: 1912 ·United States
  • Snowy Mountain
    Distance: 35 km ·Stratovolcano(es) ·Elevation: 2'162 m ·Last eruption: 1710 ·United States
  • Novarupta
    Distance: 36 km ·Caldera ·Elevation: 841 m ·Last eruption: 1912 ·United States
  • Trident
    Distance: 38 km ·Stratovolcano ·Elevation: 1'864 m ·Last eruption: 1974 ·United States
  • Denison
    Distance: 39 km ·Stratovolcano ·Elevation: 2'287 m ·United States

Alaska

Context for this earthquake

21 Sep 2025 – 21 Sep 2026 · M ≥ 2.0 · 4,118 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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Country statistics · United States

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