QuakeFactsEvidence report · prepared 2 September 2026https://quakes99.com/entity/cdmg19070811121900000
USGS cdmg19070811121900000
11 Aug 1907, 12:19
Off the coast of Northern California
A magnitude 6.4 mw earthquake at 0 km depth.
Published location
Where is Off the coast of Northern 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.
40.500000, -125.500000
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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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Nearby events with a similar magnitude
Catalog fields and provenance
Event ID
cdmg19070811121900000
Coordinates
40.5, -125.5
Network
cdmg
Significance
630