M5.2

M 5.2 - 92 km SSW of Nikolski, Alaska

Moderate Earthquake · September 5, 2025 · 92 km SSW of Nikolski, Alaska

Key Insights

•This M5.2 moderate earthquake ranks #312 out of 470 events in the database.
•At M5.2, this is 0.5 points below the database average of M5.7.
•The 35.0 km focal depth is classified as intermediate (average: 27 km across all events).
•This earthquake triggered a tsunami advisory — only 174 of 470 events (37%) in our database generated tsunami warnings.
•1 people reported feeling this earthquake via the USGS "Did You Feel It?" system, with a significance score of 416.

Depth

35.0 km

Tsunami

Yes

Felt Reports

Significance

416

Earthquake Details

Magnitude	M5.2(mww)
Classification	Moderate Earthquake
Location	92 km SSW of Nikolski, Alaska
Date & Time	September 5, 2025 04:54:26
Coordinates	52.1859N, 169.4297W
Depth	35.0 km (Intermediate)
Tsunami	Yes — Advisory/Warning Issued
Felt Reports	1 reports submitted to USGS
CDI (Community Intensity)	2.5
MMI (Modified Mercalli)	2.6
Significance Score	416 / 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 M5.2, 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/us7000qtwh

Frequently Asked Questions

How strong was the 92 km SSW of Nikolski, Alaska earthquake?

The 92 km SSW of Nikolski, Alaska earthquake had a magnitude of 5.2 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 52.1859N, 169.4297W, 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?

Yes, a tsunami advisory or warning was associated with this earthquake. Coastal residents in affected areas should always follow local emergency management guidance during tsunami events. Even small tsunamis can produce dangerous currents.

How many people felt this earthquake?

1 people submitted felt reports to the USGS for this earthquake. The Community Decimal Intensity (CDI) reached 2.5, indicating light shaking noticed by some people. The Modified Mercalli Intensity (MMI) was estimated at 2.6.

When did this earthquake happen and how significant was it?

This earthquake occurred on September 5, 2025 at 04:54:26. The USGS assigned it a significance score of 416 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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Key Insights

•This M5.2 moderate earthquake ranks #312 out of 470 events in the database.

•At M5.2, this is 0.5 points below the database average of M5.7.

•The 35.0 km focal depth is classified as intermediate (average: 27 km across all events).

•This earthquake triggered a tsunami advisory — only 174 of 470 events (37%) in our database generated tsunami warnings.

•1 people reported feeling this earthquake via the USGS "Did You Feel It?" system, with a significance score of 416.

Earthquake Details

Magnitude

M5.2(mww)

Classification

Moderate Earthquake

Location

92 km SSW of Nikolski, Alaska

Date & Time

September 5, 2025 04:54:26

Coordinates

52.1859N, 169.4297W

Depth

35.0 km (Intermediate)

Tsunami

Yes — Advisory/Warning Issued

Felt Reports

1 reports submitted to USGS

CDI (Community Intensity)

2.5

MMI (Modified Mercalli)

2.6

Significance Score

416 / 3,000

Status

reviewed