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United States · Alaska

M5.5 Earthquake near Unorganized Borough, Alaska (United States)

UTC time: 2026-05-09 04:42:21 UTC Local time: —
Earthquake newsQuakeMap24
Archive record · original publication time was not recorded

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

Magnitude
M5.5
Depth
10.0 km
Source
SERBIA_RSZ

Alaska · Unorganized Borough

Country overview

Map

M5.5 Earthquake near Unorganized Borough, Alaska (United States) · 2026-05-09 — Map showing the location of the epicenter
M5.5 Earthquake near Unorganized Borough, Alaska (United States) · 2026-05-09 — Map showing the location of the epicenter

About this earthquake

A magnitude M5.5 earthquake was recorded near Unorganized Borough, Alaska (United States) on May 9, 2026 at 04:42 UTC. With a focal depth of about 10 km, this was a shallow earthquake, whose shaking is usually felt more strongly at the surface. Events of this size can cause damage near the epicenter.

The data is provided by Seismological Survey of Serbia and cross-checked across seismological networks. United States: over the past 24 hours, QuakeMap24 logged 154 earthquakes, the strongest at M2.9.

Depth profile

Depth profile Depth: 10 km (Shallow) Surface Shallow Intermediate Deep 0 km 70 km 300 km 700 km 10 km
Shallow
10 km
10 km — shallower than the regional average (15.3 km)
Regional average: 15.3 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

  • Semisopochnoi
    Distance: 67 km ·Stratovolcano ·Elevation: 1'221 m ·Last eruption: 2023 ·United States
  • Little Sitkin
    Distance: 83 km ·Stratovolcano ·Elevation: 1'174 m ·Last eruption: 1830 ·United States
  • Davidof
    Distance: 94 km ·Stratovolcano ·Elevation: 328 m ·United States
  • Segula
    Distance: 107 km ·Stratovolcano ·Elevation: 1'160 m ·United States
  • Kiska
    Distance: 142 km ·Stratovolcano ·Elevation: 1'220 m ·Last eruption: 1990 ·United States
  • Buldir
    Distance: 256 km ·Stratovolcano ·Elevation: 656 m ·United States

Subsequent earthquakes nearby

Events recorded after this earthquake within 150 km. They are not automatically classified as aftershocks.

First 6 hours7
First 24 hours7
First 72 hours7
Strongest subsequent eventM6.1
M5.52026-05-09 04:42:22 UTC6.3 kmRat Islands, Aleutian Islands M5.32026-05-09 04:42:22 UTC12.6 kmEvent of magnitude 5.3, near Anchorage (Monde) M6.12026-05-09 04:42:22 UTC42.4 kmRat Islands, Aleutian Islands, Alaska M5.92026-05-09 04:42:22 UTC31.3 km292 km WSW of Adak, Alaska M5.32026-05-09 04:42:23 UTC44.1 kmRat Islands, Aleutian Islands, Alaska M5.92026-05-09 04:42:25 UTC17.9 kmRat Islands, Aleutian Islands, United States [Sea: United States] M5.82026-05-09 04:42:26 UTC12.6 kmRAT ISLANDS, ALEUTIAN ISLANDS M3.92026-05-13 03:37:20 UTC41.6 km295 km WSW of Adak, Alaska M0.72026-05-22 18:34:33 UTC134.1 kmUnorganized Borough M4.02026-05-25 05:28:14 UTC41.0 kmRAT ISLANDS, ALEUTIAN ISLANDS M2.62026-05-26 21:56:37 UTC126.7 km161 km WSW of Adak, Alaska M4.62026-05-27 05:57:10 UTC65.5 kmRAT ISLANDS, ALEUTIAN ISLANDS

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 150 km.

Magnitude rank#15
Earlier events M≥486
Earlier events M≥546
Compared since2025-01-30

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

Strongest earlier events

M6.12026-03-04 17:54:35 UTC82.2 km M6.12025-08-28 11:07:35 UTC99.5 kmRat Islands, Aleutian Islands M5.92025-08-28 11:07:50 UTC92.9 kmRat Islands, Aleutian Islands, United States [Sea: United States] M5.92025-08-28 11:07:48 UTC81.7 km241 km W of Adak, Alaska M5.92025-08-28 11:07:48 UTC104.7 kmRAT ISLANDS, ALEUTIAN ISLANDS

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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