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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: 194 earthquakes were recorded in the past 24 hours, the strongest reaching M4.5.

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 eventM4.7
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 km169 km WSW of Nikolski, Alaska M3.92026-09-18 01:07:40 UTC143.0 kmFOX ISLANDS, ALEUTIAN ISLANDS M3.52026-09-20 19:15:56 UTC51.6 km168 km SW of Nikolski, Alaska M3.62026-09-21 02:38:33 UTC60.4 kmFOX ISLANDS, ALEUTIAN ISLANDS M3.92026-09-22 00:44:44 UTC46.4 kmFOX ISLANDS, ALEUTIAN ISLANDS M3.62026-10-03 21:25:22 UTC177.5 kmANDREANOF ISLANDS, ALEUTIAN IS. M2.52026-10-06 18:53:24 UTC202.4 kmAlaska M1.22026-10-13 03:19:25 UTC90.3 kmUnorganized Borough M1.62026-10-13 03:40:17 UTC91.8 kmUnorganized Borough M1.32026-10-13 03:49:49 UTC92.2 kmUnorganized Borough

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

05 Oct 2025 – 05 Oct 2026 · M ≥ 3.0 · 653 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

Historical context nearby

Comparison with recorded earthquakes before this event within 250 km.

Magnitude rank#1
Earlier events M≥4201
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 UTC124.7 km###.# km ( ###.# mi) WNW (az= 303.5) from Port Orford, OR M6.32026-02-23 05:11:49 UTC92.4 kmAlaska M6.22025-09-03 20:57:41 UTC160.1 km87 km SW of Nikolski, Alaska M6.12026-02-23 05:11:48 UTC92.4 km###.# km ( ###.# mi) WNW (az= 303.7) from Port Orford, OR M6.12026-02-23 05:11:48 UTC71.3 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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