QuakeFactsEvidence report · prepared 2 September 2026https://quakes99.com/entity/uw19090111234600000
USGS uw19090111234600000
11 Jan 1909, 23:46
San Juan Islands, Washington
A magnitude 6 ml earthquake at 0 km depth.
Published location
Where is San Juan Islands, Washington?
This locator uses the coordinates in the approved source record. It shows geographic context, not a site boundary, safety zone or property-risk area.
48.700000, -122.800000
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
uw19090111234600000
Coordinates
48.7, -122.8
Network
uw
Significance
554