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United States · Alaska

M5.1 Earthquake near Unorganized Borough, Alaska (United States)

UTC time: 2025-03-20 05:13:06 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.

Map

M5.1 Earthquake near Unorganized Borough, Alaska (United States) · 2025-03-20 — Map showing the location of the epicenter
M5.1 Earthquake near Unorganized Borough, Alaska (United States) · 2025-03-20 — Map showing the location of the epicenter

About this earthquake

A magnitude M5.1 earthquake was recorded near Unorganized Borough, Alaska (United States) on March 20, 2025 at 05:13 UTC. With a focal depth of about 10 km, this was a shallow earthquake, whose shaking is usually felt more strongly at the surface. Earthquakes of this magnitude can damage poorly built structures.

The data is provided by USP and cross-checked across seismological networks. United States: 180 earthquakes were recorded in the past 24 hours, the strongest reaching M3.0.

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 (15.2 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

  • Moffett
    Distance: 33 km ·Stratovolcano ·Elevation: 1'196 m ·Last eruption: -1600 ·United States
  • Kanaga
    Distance: 49 km ·Stratovolcano ·Elevation: 1'307 m ·Last eruption: 2023 ·United States
  • Great Sitkin WATCH · ORANGE
    Distance: 56 km ·Stratovolcano ·Elevation: 1'740 m ·Last eruption: 2026 ·United States
  • Bobrof
    Distance: 64 km ·Stratovolcano ·Elevation: 738 m ·United States
  • Kasatochi
    Distance: 94 km ·Stratovolcano ·Elevation: 314 m ·Last eruption: 2008 ·United States
  • Takawangha
    Distance: 100 km ·Stratovolcano ·Elevation: 1'449 m ·Last eruption: 1550 ·United States

Radius · 100 km

Nearby infrastructure

Up to 3 nearest sites per category

Airports

  • Adak AirportUnited States · ADK · PADK
    24.9 kmStraight-line distance

Source: OurAirports · Dataset date: 2026-09-21

This selection shows geographic proximity, not a hazard zone or confirmed impacts. Distances use recorded site coordinates. Sources & data dates

Subsequent earthquakes nearby

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

First 6 hours30
First 24 hours83
First 72 hours212
Strongest subsequent eventM6.2
M3.42025-03-20 05:18:43 UTC69.5 km92 km SSE of Adak, Alaska M2.72025-03-20 05:22:21 UTC74.8 km97 km SSE of Adak, Alaska M3.42025-03-20 05:26:17 UTC75.9 km98 km SSE of Adak, Alaska M3.22025-03-20 05:35:45 UTC66.4 km89 km SSE of Adak, Alaska M3.52025-03-20 05:46:50 UTC58.2 km80 km SSE of Adak, Alaska M2.22025-03-20 05:58:57 UTC69.0 km91 km SSE of Adak, Alaska M5.12025-03-20 06:07:06 UTC64.0 kmAndreanof Islands, Aleutian Islands M2.62025-03-20 06:25:50 UTC70.9 km93 km SSE of Adak, Alaska M3.02025-03-20 06:35:06 UTC61.8 km83 km SSE of Adak, Alaska M4.02025-03-20 06:50:29 UTC64.7 km87 km SSE of Adak, Alaska M2.62025-03-20 07:09:19 UTC86.8 km109 km SSE of Adak, Alaska M2.72025-03-20 07:35:22 UTC68.6 km90 km SSE of Adak, Alaska

Alaska

Context for this earthquake

22 Sep 2025 – 21 Sep 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#3
Earlier events M≥411
Earlier events M≥54
Compared since2025-01-02

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

Strongest earlier events

M5.62025-03-20 04:28:54 UTC77.3 km M5.62025-03-20 04:28:52 UTC64.9 km87 km SSE of Adak, Alaska M5.02025-03-19 08:13:08 UTC75.7 km98 km SSE of Adak, Alaska M5.02025-02-27 21:48:30 UTC73.2 km53 km NE of Adak, Alaska M4.92025-01-22 13:26:06 UTC27.6 km51 km S of Adak, Alaska

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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