QuakeFactsEvidence report · prepared 2 September 2026https://quakes99.com/entity/ushis495
USGS ushis495
29 Oct 1909, 06:45
Near Rio Dell, California
A magnitude 6 mw earthquake at 0 km depth.
Published location
Where is Near Rio Dell, 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, -124.200000
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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
ushis495
Coordinates
40.5, -124.2
Network
ushis
Significance
554