The January 31, 1912 earthquake
M6.7Prince William Sound, Alaska
A magnitude 6.7 earthquake 15.5 miles deep, 8.5 miles off Chugach Census Area. The 140th strongest in Alaska’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
- 15.5 mi
- 25.0 km below the surface
- Local time
- Wednesday, January 31, 1912
- 10:11 AST; 20:11 UTC
- In Alaska’s record
- 140th
- strongest of 124,625 since 1900
USGS ANSS Comprehensive Earthquake Catalog, event iscgem16958179 (“Prince William Sound, Alaska”). 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
- Chugach Census AreaAK · 8.5 mi
- Copper River Census AreaAK · 43.1 mi
- Anchorage MunicipalityAK · 49.3 mi
Earthquakes around the epicentre
559 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
- September 21, 1911M6.3
- February 14, 1908M6.0
USGS ANSS Comprehensive Earthquake Catalog. Local time is the time zone of the county nearest the epicentre. Magnitudes are as the catalogue reports them.