QuakeFactsEvidence report · prepared 2 September 2026https://quakes99.com/entity/iscgem891371
USGS iscgem891371
21 Dec 1954, 19:56
The 1954 Eureka-Arcata, California Earthquake
A magnitude 6.4 mw earthquake at 15 km depth.
Published location
Where is The 1954 Eureka-Arcata, California Earthquake?
This locator uses the coordinates in the approved source record. It shows geographic context, not a site boundary, safety zone or property-risk area.
40.846000, -123.893000
Open the interactive map ↗Map data © OpenStreetMap contributors
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.
Continue exploring
Nearby events with a similar magnitude
Catalog fields and provenance
Event ID
iscgem891371
Coordinates
40.846, -123.893
Network
iscgem
Significance
630