The August 9, 1967 earthquake
M5.5near Lochbuie, Colorado
A magnitude 5.5 earthquake 6.2 miles deep, centred in Adams County. The 2nd 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
- moment magnitude (mw)
- Depth
- 6.2 mi
- 10.0 km below the surface
- Local time
- Wednesday, August 9, 1967
- 07:25 MDT; 13:25 UTC
- In Colorado’s record
- 2nd
- strongest of 543 since 1900
USGS ANSS Comprehensive Earthquake Catalog, event iscgem832092 (“7 km SE of Lochbuie, 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
- Adams CountyCO · inside
- Denver CountyCO · 3.4 mi
- Broomfield CountyCO · 16.2 mi
- Weld CountyCO · 16.2 mi
- Arapahoe CountyCO · 19.1 mi
- Boulder CountyCO · 20.8 mi
- Jefferson CountyCO · 21.0 mi
- Douglas CountyCO · 27.0 mi
- Elbert CountyCO · 27.0 mi
- Morgan CountyCO · 27.2 mi
- Larimer CountyCO · 29.6 mi
- Gilpin CountyCO · 39.1 mi
- Clear Creek CountyCO · 41.7 mi
- Park CountyCO · 47.6 mi
Cities, largest first
- DenverCO · 17.8 mi
- AuroraCO · 17.4 mi
- Fort CollinsCO · 46.1 mi
- LakewoodCO · 30.1 mi
- ThorntonCO · 15.1 mi
- ArvadaCO · 27.3 mi
- WestminsterCO · 21.9 mi
- GreeleyCO · 32.1 mi
- CentennialCO · 27.5 mi
- BoulderCO · 31.6 mi
- LongmontCO · 27.4 mi
- Castle RockCO · 41.4 mi
Earthquakes around the epicentre
4 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.