How strong was the 74 km WNW of Ferndale, CA earthquake?
The 74 km WNW of Ferndale, CA earthquake had a magnitude of 4.51 mw, classified as a "Light" earthquake on the magnitude scale. Earthquakes of this magnitude are typically felt by people nearby but rarely cause significant structural damage.
Where exactly did this earthquake occur and how deep was it?
This earthquake struck at coordinates 40.7680N, 125.1063W, at a depth of 9.2 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?
123 people submitted felt reports to the USGS for this earthquake. The Community Decimal Intensity (CDI) reached 3.4, indicating light shaking noticed by some people. The Modified Mercalli Intensity (MMI) was estimated at 2.7.
When did this earthquake happen and how significant was it?
This earthquake occurred on July 30, 2025 at 08:18:18. The USGS assigned it a significance score of 355 out of a possible 3,000, which factors in magnitude, felt reports, and potential impact. This is a relatively routine seismic event. The PAGER alert level was "green", indicating the estimated level of response needed.