M1.9 earthquake 13 km N of Dillon, Montana

A magnitude 1.9 earthquake struck 13 km N of Dillon, Montana on Thu, Aug 6, 2015, 4:48 AM MDT (10:48 UTC), 10 km (6 mi) below the surface.

Automatic solution: the magnitude and location may still be revised.

A larger quake followed: M3.4 32 km W of Hebgen Lake Estates, Montana. This one was a foreshock.

Map

Where this earthquake was located, with the others nearby. Select one for its page.

No one has reported feeling this quake to the USGS.

An automatic solution; a seismologist may revise it.

Distance and direction from each place to the epicenter, with its forecast.

Within 100 km, magnitude 1.5 and up: 13 in the 60 days after this one and 3 in the 30 days before it.

From the USGS Earthquake Hazards Program and its partner networks, event mb15866721. Read Tue, Sep 22, 2026, 8:40 PM UTC.