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United States · Alaska

M6.4 Earthquake near Unorganized Borough, Alaska (United States)

UTC time: 2026-09-17 14:19:53 UTC Local time: —
Earthquake newsQuakeMap24
First published: Content updated:

Automatically generated from measurement data by QuakeMap24. Values may change after further analysis.

Map

M6.4 Earthquake near Unorganized Borough, Alaska (United States) · 2026-09-17 — Map showing the location of the epicenter
M6.4 Earthquake near Unorganized Borough, Alaska (United States) · 2026-09-17 — Map showing the location of the epicenter

About this earthquake

A magnitude M6.4 earthquake was recorded near Unorganized Borough, Alaska (United States) on September 17, 2026 at 14:19 UTC. The earthquake originated at an intermediate depth of about 115 km. Earthquakes of this magnitude can cause significant damage in populated areas.

The event was recorded by USGS. United States: 184 earthquakes were recorded in the past 24 hours, the strongest reaching M3.0.

Depth profile

Depth profile Depth: 114.8 km (Intermediate) Surface Shallow Intermediate Deep 0 km 70 km 300 km 700 km 114.8 km
Intermediate
114.8 km
114.8 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

Estimated impact

Green No or minimal impact expected.
8 Felt reports · max reported intensity 3.4

Ground shaking

V
Moderate · Intensity (MMI) V
Felt by all, slight damage possible.

Tectonic context

Located on the North America Plate.
Near the boundary North America ↔ Pacific · about 163 km away

Volcanoes nearby

  • Chagulak
    Distance: 4 km ·Stratovolcano ·Elevation: 1'028 m ·United States
  • Amukta
    Distance: 7 km ·Stratovolcano ·Elevation: 1'066 m ·Last eruption: 1996 ·United States
  • Yunaska
    Distance: 39 km ·Shield ·Elevation: 550 m ·Last eruption: 1937 ·United States
  • Herbert
    Distance: 76 km ·Stratovolcano ·Elevation: 1'280 m ·United States
  • Carlisle
    Distance: 86 km ·Stratovolcano ·Elevation: 1'620 m ·Last eruption: 1828 ·United States
  • Cleveland
    Distance: 89 km ·Stratovolcano ·Elevation: 1'730 m ·Last eruption: 2020 ·United States

Subsequent earthquakes nearby

Events recorded after this earthquake within 250 km. They are not automatically classified as aftershocks.

First 6 hours3
First 24 hours4
First 72 hours4
Strongest subsequent eventM3.9
M3.92026-09-17 14:34:20 UTC41.5 kmFOX ISLANDS, ALEUTIAN ISLANDS M3.82026-09-17 14:39:41 UTC19.1 kmAlaska M3.92026-09-17 14:46:42 UTC36.2 kmFOX ISLANDS, ALEUTIAN ISLANDS M3.92026-09-18 01:07:40 UTC143.0 kmFOX ISLANDS, ALEUTIAN ISLANDS M3.52026-09-20 19:15:56 UTC51.6 kmFOX ISLANDS, ALEUTIAN ISLANDS M3.62026-09-21 02:38:33 UTC60.4 kmFOX ISLANDS, ALEUTIAN ISLANDS

Comparison of seismic sources

8 sources currently report magnitudes from M6.1 to M6.5.

Measurements can differ because agencies use different networks and calculation methods. Values may be revised.

SourceMagnitudeDepthPosition difference
SERBIA_RSZM6.310.0 km45.6 km
EMSCM6.435.0 km31.9 km
GFZM6.491.0 km42.6 km
RESIFM6.184.2 km45.0 km
USPM6.1101.0 km42.8 km
SCEDCM6.5111.7 km25.6 km
USGSM6.383.0 km31.4 km
INGVM6.599.2 km25.9 km

Alaska

Context for this earthquake

21 Sep 2025 – 21 Sep 2026 · M ≥ 3.0 · 654 Catalogue entries

Of 653 other entries for this area and period, 1 have a higher stored magnitude. Different magnitude types and reports not yet merged limit the comparison.

Open seismic profile

Historical context nearby

Comparison with recorded earthquakes before this event within 250 km.

Magnitude rank#1
Earlier events M≥4199
Earlier events M≥587
Compared since2025-01-13

The QuakeMap24 comparison dataset begins on 2024-03-23. Earlier earthquakes may not be included.

Strongest earlier events

M6.32026-09-03 11:17:24 UTC144.4 km###.# km ( ###.# mi) WNW (az= 303.5) from Port Orford, OR M6.32026-02-23 05:11:49 UTC112.2 kmAlaska M6.22025-09-03 20:57:41 UTC183.1 km87 km SW of Nikolski, Alaska M6.12026-02-23 05:11:48 UTC112.2 km###.# km ( ###.# mi) WNW (az= 303.7) from Port Orford, OR M6.12026-02-23 05:11:48 UTC83.3 kmAlaska

Historic earthquake map · United States

Open history map
Explore recent and long-term earthquake activity in this country. Use filters to narrow down by magnitude, depth, and date range.

Country statistics · United States

Country overview
View earthquake KPIs, strongest and latest events, and averages for this country.

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