The April 13, 1949 earthquake
M6.7near Roy, Washington
A magnitude 6.7 earthquake 31.1 miles deep, centred in Pierce County. The 2nd strongest in Washington’s record since 1900, and the strongest within 50 miles in the catalogue, which runs from 1900.
The earthquake
- Magnitude
- 6.7
- moment magnitude (mw)
- Depth
- 31.1 mi
- 50.0 km below the surface
- Local time
- Wednesday, April 13, 1949
- 11:55 PST; 19:55 UTC
- In Washington’s record
- 2nd
- strongest of 5,002 since 1900
USGS ANSS Comprehensive Earthquake Catalog, event iscgem896466 (“4 km WNW of Roy, 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
- Pierce CountyWA · inside
- Thurston CountyWA · 1.9 mi
- Mason CountyWA · 16.3 mi
- King CountyWA · 20.9 mi
- Lewis CountyWA · 25.4 mi
- Grays Harbor CountyWA · 26.5 mi
- Kitsap CountyWA · 27.0 mi
- Pacific CountyWA · 39.6 mi
- Jefferson CountyWA · 44.7 mi
- Cowlitz CountyWA · 46.6 mi
- Skamania CountyWA · 46.6 mi
Earthquakes around the epicentre
180 earthquakes of magnitude 3 or more within 50 miles of this epicentre since 1973.
Earlier earthquakes of magnitude 5 or more within 50 miles, strongest first
USGS ANSS Comprehensive Earthquake Catalog. Local time is the time zone of the county nearest the epicentre. Magnitudes are as the catalogue reports them.