Source: Adapted from Smith, R. B., and Arabasz, W. J. (1991). Seismicity of the Intermountain Seismic Belt, in Slemmons, D. B., Engdahl, E. R., Zoback, M. D., and Blackwell, D. D., editors, Neotectonics of North America, Geological Society of America, Decade Map Volume 1, p. 185-228.

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