The December 12, 1926 earthquake
M5.4Clarkston Valley, Montana (Aftershock)
A magnitude 5.4 earthquake, centred in Gallatin County. The 16th strongest in Montana’s record since 1900, and the strongest within 50 miles since a magnitude 5.5 on July 10, 1925.
The earthquake
- Magnitude
- 5.4
- as reported (mfa)
- Depth
- —
- Not recorded
- Local time
- Sunday, December 12, 1926
- 17:44 MST; 00:44 UTC on Dec 13, 1926
- In Montana’s record
- 16th
- strongest of 1,459 since 1900
USGS ANSS Comprehensive Earthquake Catalog, event ushis755 (“Clarkston Valley, Montana (Aftershock)”). 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
- Gallatin CountyMT · inside
- Broadwater CountyMT · 7.3 mi
- Meagher CountyMT · 9.2 mi
- Park CountyMT · 20.9 mi
- Jefferson CountyMT · 22.3 mi
- Madison CountyMT · 32.5 mi
- Lewis and Clark CountyMT · 38.5 mi
- Sweet Grass CountyMT · 44.7 mi
- Wheatland CountyMT · 44.7 mi
Earthquakes around the epicentre
129 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
- June 27, 1925M6.6
- June 27, 1925M6.4
- June 27, 1925M5.5
- June 27, 1925M5.5
- July 10, 1925M5.5
USGS ANSS Comprehensive Earthquake Catalog. Local time is the time zone of the county nearest the epicentre. Magnitudes are as the catalogue reports them.