Bulletin of the Seismological Society of America
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Bulletin of the Seismological Society of America; December 1979; v. 69; no. 6; p. 1917-1929
© 1979 Seismological Society of America
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Seismic activity near the Three Forks Basin, Montana

ANTHONY QAMAR and BRONSON HAWLEY

DEPARTMENT OF GEOLOGY UNIVERSITY OF MONTANA, MISSOULA, MONTANA 59812
GEOLOGY AND GEOPHYSICS DEPARTMENT UNIVERSITY OF UTAH, SALT LAKE CITY, UTAH 84112

Abstract

Most historical earthquakes near the Three Forks Basin, Montana have concentrated in the southwestern and northern portions of the basin and not along the spectacular escarpment of the Bridger Range fault which bounds the basin on the east.

Relocation of earthquakes from 1974 to 1977 using earthquake data from regional seismograph networks and three microearthquake surveys (1974, 1976, and 1977) show that the most seismically active area is the Clarkston Valley, 10 km north of the Three Forks Basin. Reanalysis of travel-time data confirms Pardee's (1926) hypothesis that the large Montana earthquake of 1925 (Magnitude Formula) also occurred in Clarkston Valley. The seismologically determined focal mechanism for this earthquake differs from fault mechanisms of recent events in the valley.




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