QuakeFactsEvidence report · prepared 2 September 2026https://quakes99.com/entity/usp000278e
USGS usp000278e
10 Sept 1984, 04:14
217 km W of Ferndale, California
A magnitude 6.7 mw earthquake at 10 km depth.
Published location
Where is 217 km W of Ferndale, California?
This locator uses the coordinates in the approved source record. It shows geographic context, not a site boundary, safety zone or property-risk area.
40.503000, -126.831000
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What the numbers mean
Magnitude measures event size; depth locates the source below the surface. Neither value alone establishes local damage or personal risk.
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Use local emergency authorities and the live USGS event page. This historical evidence page is not an alert service.
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Catalog fields and provenance
Event ID
usp000278e
Coordinates
40.503, -126.831
Network
us
Significance
691