M6.3

M 6.3 - 104 km SSW of Adak, Alaska

Strong Earthquake · December 9, 2024 · 104 km SSW of Adak, Alaska

Key Insights

•This M6.3 strong earthquake ranks #93 out of 470 events in the database.
•At M6.3, this is 0.6 points above the database average of M5.7. Each whole magnitude point represents roughly 32x more energy released.
•At 19.0 km depth, this is classified as a shallow earthquake. Shallow quakes typically cause stronger ground shaking and more damage than deeper events (avg depth: 27 km).
•This earthquake triggered a tsunami advisory — only 174 of 470 events (37%) in our database generated tsunami warnings.
•A USGS significance score of 611 places this among the 265 most impactful events tracked, based on magnitude, felt reports, and damage potential.

Depth

19.0 km

Tsunami

Yes

Felt Reports

Significance

611

Earthquake Details

Magnitude	M6.3(mww)
Classification	Strong Earthquake
Location	104 km SSW of Adak, Alaska
Date & Time	December 9, 2024 09:15:30
Coordinates	50.9985N, 177.1779W
Depth	19.0 km (Shallow)
Tsunami	Yes — Advisory/Warning Issued
Felt Reports	1 reports submitted to USGS
CDI (Community Intensity)	0.0
MMI (Modified Mercalli)	4.4
PAGER Alert Level	green
Significance Score	611 / 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 M6.3, this is classified as a Strong earthquake. Earthquakes of this size can cause severe damage in populated areas within tens of miles of the epicenter.

Official USGS Page: https://earthquake.usgs.gov/earthquakes/eventpage/us7000nx5r

Frequently Asked Questions

How strong was the 104 km SSW of Adak, Alaska earthquake?

The 104 km SSW of Adak, Alaska earthquake had a magnitude of 6.3 mww, classified as a "Strong" earthquake on the magnitude scale. Earthquakes of this size can cause serious damage to buildings and infrastructure over a wide area.

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

This earthquake struck at coordinates 50.9985N, 177.1779W, at a depth of 19.0 km. Shallow earthquakes (under 20 km) tend to cause more surface damage than deeper events.

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 Modified Mercalli Intensity (MMI) was estimated at 4.4.

When did this earthquake happen and how significant was it?

This earthquake occurred on December 9, 2024 at 09:15:30. The USGS assigned it a significance score of 611 out of a possible 3,000, which factors in magnitude, felt reports, and potential impact. This is a moderately significant seismic event. The PAGER alert level was "green", indicating the estimated level of response needed.

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Key Insights

•This M6.3 strong earthquake ranks #93 out of 470 events in the database.

•At M6.3, this is 0.6 points above the database average of M5.7. Each whole magnitude point represents roughly 32x more energy released.

•At 19.0 km depth, this is classified as a shallow earthquake. Shallow quakes typically cause stronger ground shaking and more damage than deeper events (avg depth: 27 km).

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

•A USGS significance score of 611 places this among the 265 most impactful events tracked, based on magnitude, felt reports, and damage potential.

Earthquake Details

Magnitude

M6.3(mww)

Classification

Strong Earthquake

Location

104 km SSW of Adak, Alaska

Date & Time

December 9, 2024 09:15:30

Coordinates

50.9985N, 177.1779W

Depth

19.0 km (Shallow)

Tsunami

Yes — Advisory/Warning Issued

Felt Reports

1 reports submitted to USGS

CDI (Community Intensity)

0.0

MMI (Modified Mercalli)

4.4

PAGER Alert Level

green

Significance Score

611 / 3,000

Status

reviewed