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The earthquake of June 27, 1925, in Montana caused considerable damage within an area of 600 square miles or more, the center of which is in latitude 46° 5' N. and longitude 111° 20' W., a short distance southeast of Lombard. It was a seismic disturbance of the first order of magnitude, but, owing to the hour at which it occurred an<;). to other fortunate circumstances, no lives were lost and no fires broke out. The shock was startling throughout an area extending 7 5 miles or more in all directions from the ~picenter and was sensible to persons within an area of 310,000 square miles. Within the epicentral area brick buildings suffered severely, rocks fell from cliffs, cracks opened in the ground, and the inhabitants experienced the usual symptoms of illness and emotions of alarm. Isoseismals drawn according to the Rossi-Forel scale show a wide indentation at the south due to a rapid decline of intensity in the·volcanic area of Snake River Plain and Yellowstone Park. The main shock was preceded by two light foreshocks and followed by a great many aftershocks, one of which, occurring about three-quarters of an hour later, was almost as severe as the main shock. · The epicenter is in Clarkston Valley, a lowland surrounded by mountains of severely folded Mesozoic and older rocks and floored with Tertiary " lake beds" and Recent alluvium. Physiographic evidence indicates that Clarkston Valley is a structural depression bounded on the east by a fault of post-Miocene age. Presumably the origin of the earthquake was on this fault at a considerable depth below the surface. It is concluded that the region is in a st~e of moderate seismic activity and is likely in the future to be visited by an occasional severe shock.

The Montana earthquake of June 27, 1925