M5.1

M 5.1 - 79 km SE of Atka, Alaska

Moderate Earthquake · December 2, 2025 · 79 km SE of Atka, Alaska

Key Insights

•This M5.1 moderate earthquake ranks #323 out of 470 events in the database.
•At M5.1, this is 0.6 points below the database average of M5.7.
•The 35.0 km focal depth is classified as intermediate (average: 27 km across all events).
•2 people reported feeling this earthquake via the USGS "Did You Feel It?" system, with a significance score of 401.

Depth

35.0 km

Tsunami

Felt Reports

Significance

401

Earthquake Details

Magnitude	M5.1(mww)
Classification	Moderate Earthquake
Location	79 km SE of Atka, Alaska
Date & Time	December 2, 2025 07:21:07
Coordinates	51.6480N, 173.4586W
Depth	35.0 km (Intermediate)
Tsunami	No
Felt Reports	2 reports submitted to USGS
CDI (Community Intensity)	2.7
Significance Score	401 / 3,000
Status	reviewed

Magnitude Scale Context

Minor

3-3.9

Light

4-4.9

Moderate

5-5.9

Strong

6-6.9

Major

At M5.1, this is classified as a Moderate earthquake. Earthquakes of this size can cause moderate damage to vulnerable structures and are widely felt.

Official USGS Page: https://earthquake.usgs.gov/earthquakes/eventpage/us7000rez4

Frequently Asked Questions

How strong was the 79 km SE of Atka, Alaska earthquake?

The 79 km SE of Atka, Alaska earthquake had a magnitude of 5.1 mww, classified as a "Moderate" earthquake on the magnitude scale. Earthquakes of this magnitude can cause damage to poorly constructed buildings and are felt widely.

Where exactly did this earthquake occur and how deep was it?

This earthquake struck at coordinates 51.6480N, 173.4586W, at a depth of 35.0 km. This intermediate depth can still produce significant shaking at the surface.

Did this earthquake trigger a tsunami warning?

No tsunami warning was issued for this earthquake. Earthquakes below magnitude 6.5 rarely generate dangerous tsunamis, though localized effects are possible in rare cases.

How many people felt this earthquake?

2 people submitted felt reports to the USGS for this earthquake. The Community Decimal Intensity (CDI) reached 2.7, indicating light shaking noticed by some people.

When did this earthquake happen and how significant was it?

This earthquake occurred on December 2, 2025 at 07:21:07. The USGS assigned it a significance score of 401 out of a possible 3,000, which factors in magnitude, felt reports, and potential impact. This is a moderately significant seismic event.

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