The August 18, 1915 earthquake
M5.6Near Marblemount, Washington
A magnitude 5.6 earthquake, centred in Skagit County. The 10th strongest in Washington’s record since 1900, and the strongest within 50 miles in the catalogue, which runs from 1900.
The earthquake
- Magnitude
- 5.6
- local magnitude (ml)
- Depth
- —
- Not recorded
- Local time
- Wednesday, August 18, 1915
- 06:04 PST; 14:04 UTC
- In Washington’s record
- 10th
- strongest of 5,002 since 1900
USGS ANSS Comprehensive Earthquake Catalog, event ushis575 (“Near Marblemount, Washington”). The USGS event page carries the ShakeMap, felt reports and the official summary.
Counties and cities within 50 miles
Distance from the epicentre to each county boundary (zero when inside) and to each city centre.
Counties
- Skagit CountyWA · inside
- Chelan CountyWA · 15.8 mi
- Snohomish CountyWA · 23.1 mi
- Whatcom CountyWA · 24.5 mi
- Okanogan CountyWA · 29.3 mi
- Island CountyWA · 49.2 mi
Cities, largest first
- MarysvilleWA · 45.2 mi
- Lake StevensWA · 47.0 mi
- Mount VernonWA · 42.2 mi
- ArlingtonWA · 41.1 mi
- Sedro-WoolleyWA · 38.1 mi
- BurlingtonWA · 42.6 mi
Earthquakes around the epicentre
85 earthquakes of magnitude 3 or more within 50 miles of this epicentre since 1973.
No earlier earthquake of magnitude 5 or more within 50 miles in the catalogue since 1900.
USGS ANSS Comprehensive Earthquake Catalog. Local time is the time zone of the county nearest the epicentre. Magnitudes are as the catalogue reports them.