M5.1

M 5.1 - 173 km WSW of Port Orford, Oregon

Moderate Earthquake · September 10, 2025 · 173 km WSW of Port Orford, Oregon

Key Insights

•This M5.1 moderate earthquake ranks #327 out of 470 events in the database.
•At M5.1, this is 0.6 points below the database average of M5.7.
•At 10.0 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).
•5 people reported feeling this earthquake via the USGS "Did You Feel It?" system, with a significance score of 401.

Depth

10.0 km

Tsunami

Felt Reports

Significance

401

Earthquake Details

Magnitude	M5.1(mww)
Classification	Moderate Earthquake
Location	173 km WSW of Port Orford, Oregon
Date & Time	September 10, 2025 04:31:43
Coordinates	42.4522N, 126.5700W
Depth	10.0 km (Shallow)
Tsunami	No
Felt Reports	5 reports submitted to USGS
CDI (Community Intensity)	2.0
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/us7000qv3g

Frequently Asked Questions

How strong was the 173 km WSW of Port Orford, Oregon earthquake?

The 173 km WSW of Port Orford, Oregon 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 42.4522N, 126.5700W, at a depth of 10.0 km. Shallow earthquakes (under 20 km) tend to cause more surface damage than deeper events.

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?

5 people submitted felt reports to the USGS for this earthquake. The Community Decimal Intensity (CDI) reached 2.0, indicating light shaking noticed by some people.

When did this earthquake happen and how significant was it?

This earthquake occurred on September 10, 2025 at 04:31:43. 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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Key Insights

•This M5.1 moderate earthquake ranks #327 out of 470 events in the database.

•At M5.1, this is 0.6 points below the database average of M5.7.

•At 10.0 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).

•5 people reported feeling this earthquake via the USGS "Did You Feel It?" system, with a significance score of 401.

Earthquake Details

Magnitude

M5.1(mww)

Classification

Moderate Earthquake

Location

173 km WSW of Port Orford, Oregon

Date & Time

September 10, 2025 04:31:43

Coordinates

42.4522N, 126.5700W

Depth

10.0 km (Shallow)

Tsunami

Felt Reports

5 reports submitted to USGS

CDI (Community Intensity)

2.0

Significance Score

401 / 3,000

Status

reviewed