QuakeFactsEvidence report · prepared 2 September 2026https://quakes99.com/entity/iscgem913532
USGS iscgem913532
10 Jun 1917, 05:32
off the coast of Northern California
A magnitude 6.4 mw earthquake at 15 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.
40.205000, -127.932000
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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.
Need a current safety answer?
Use local emergency authorities and the live USGS event page. This historical evidence page is not an alert service.
Catalog fields and provenance
Event ID
iscgem913532
Coordinates
40.205, -127.932
Network
iscgem
Significance
626