Site-Specific Seismic Hazard Evaluation for the Proposed Resolution Copper Mine, Southern Arizona
A probabilistic seismic hazard analysis (PSHA) and deterministic seismic hazard analysis (DSHA) were performed for Resolution Copper’s Mine site including the area above the deposit (Mine area) and the area covering the East Plant site (Shafts 9/10). The peak horizontal ground acceleration (PGA) value for a return period of 2475 years is 0.06 g. This return period is used in the International Building Code (IBC) for the design of typical buildings and other structures in the U.S. A value of 0.06 g indicates a low level of hazard due to the low level of historical seismicity in southern Arizona and the absence of nearby Quaternary faults near the Mine. By comparison, PGA values along coastal California for a return period of 2475 years often exceed 1 g.
Wong, I., P. Thomas, N. Lewandowski, and S. Lindvall. 2018. Site-Specific Seismic Hazard Evaluation for the Proposed Resolution Copper Mine, Southern Arizona. Prepared for Resolution Copper. Walnut Creek, California: Lettis Consultants International Inc. January 23.