A minimum of twelve high sensitivity microearthquake instruments were operated for two week periods in the San Bernardino, Clifton-Safford-Morenci, and Springerville-St. Johns areas of Arizona during the Summer of 1978. The purpose of this program was to assess the seismicity of these areas and to relate any earthquakes detected to faulting and the regional tectonics of the areas. Only one earthquake, which was located in the southern part of the San Bernardino area, was recorded. This activity is less than that observed during the same summer in Prescott, Arizona and in the southern extension of the San Bernardino valley, into northern Sonora. It is evident that a two week period is not adequate to properly assess the seismicity of these areas. (13 pages)