The October 11, 1960 earthquake
M5.5near Colona, Colorado
A magnitude 5.5 earthquake 30.4 miles deep, centred in Gunnison County. The strongest in Colorado’s record since 1900, and the strongest within 50 miles in the catalogue, which runs from 1900.
The earthquake
- Magnitude
- 5.5
- body-wave magnitude (mb)
- Depth
- 30.4 mi
- 49.0 km below the surface
- Local time
- Tuesday, October 11, 1960
- 01:05 MST; 08:05 UTC
- In Colorado’s record
- 1st
- strongest of 543 since 1900
USGS ANSS Comprehensive Earthquake Catalog, event ushis2466 (“15 km E of Colona, Colorado”). 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
- Gunnison CountyCO · inside
- Ouray CountyCO · 1.8 mi
- Montrose CountyCO · 1.9 mi
- Hinsdale CountyCO · 10.7 mi
- San Miguel CountyCO · 20.3 mi
- San Juan CountyCO · 23.2 mi
- Delta CountyCO · 26.0 mi
- Saguache CountyCO · 33.6 mi
- Mineral CountyCO · 35.4 mi
- Dolores CountyCO · 37.2 mi
- Mesa CountyCO · 44.4 mi
- La Plata CountyCO · 46.1 mi
- Montezuma CountyCO · 49.9 mi
Cities, largest first
- MontroseCO · 18.2 mi
Earthquakes around the epicentre
6 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.