M6.9

M 6.9 - 96 km WNW of Bahía de Kino, Mexico

Strong Earthquake · August 4, 2009 · 96 km WNW of Bahía de Kino, Mexico

Key Insights

•This M6.9 event ranks #32 of 470 earthquakes by magnitude, stronger than 93% of recorded US events.
•At M6.9, this is 1.2 points above the database average of M5.7. Each whole magnitude point represents roughly 32x more energy released.
•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).
•With 1,068 "Did You Feel It?" reports submitted to USGS, this was widely felt by the public. The significance score of 1202 reflects its overall community impact.

Depth

10.0 km

Tsunami

Felt Reports

1,068

Significance

1202

Earthquake Details

Magnitude	M6.9(mwc)
Classification	Strong Earthquake
Location	96 km WNW of Bahía de Kino, Mexico
Date & Time	August 4, 2009 02:59:56
Coordinates	29.0390N, 112.9030W
Depth	10.0 km (Shallow)
Tsunami	No
Felt Reports	1,068 reports submitted to USGS
CDI (Community Intensity)	4.7
MMI (Modified Mercalli)	6.6
Significance Score	1202 / 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 M6.9, 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/usp000gzyb

Frequently Asked Questions

How strong was the 96 km WNW of Bahía de Kino, Mexico earthquake?

The 96 km WNW of Bahía de Kino, Mexico earthquake had a magnitude of 6.9 mwc, 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 29.0390N, 112.9030W, 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. While the magnitude was significant, the location and depth characteristics did not warrant a tsunami advisory.

How many people felt this earthquake?

1,068 people submitted felt reports to the USGS for this earthquake. The Community Decimal Intensity (CDI) reached 4.7, indicating moderate shaking felt by most people indoors. The Modified Mercalli Intensity (MMI) was estimated at 6.6.

When did this earthquake happen and how significant was it?

This earthquake occurred on August 4, 2009 at 02:59:56. The USGS assigned it a significance score of 1202 out of a possible 3,000, which factors in magnitude, felt reports, and potential impact. This is considered a highly significant seismic event.

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Key Insights

•This M6.9 event ranks #32 of 470 earthquakes by magnitude, stronger than 93% of recorded US events.

•At M6.9, this is 1.2 points above the database average of M5.7. Each whole magnitude point represents roughly 32x more energy released.

•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).

•With 1,068 "Did You Feel It?" reports submitted to USGS, this was widely felt by the public. The significance score of 1202 reflects its overall community impact.

Earthquake Details

Magnitude

M6.9(mwc)

Classification

Strong Earthquake

Location

96 km WNW of Bahía de Kino, Mexico

Date & Time

August 4, 2009 02:59:56

Coordinates

29.0390N, 112.9030W

Depth

10.0 km (Shallow)

Tsunami

Felt Reports

1,068 reports submitted to USGS

CDI (Community Intensity)

4.7

MMI (Modified Mercalli)

6.6

Significance Score

1202 / 3,000

Status

reviewed