The map was developed using 13 instrumented stations and a large number of modified Mercalli intensity (MMI) observations used as constraints by treating these intensities and associated ground-motions as “data” (Wald et al., 2006). To convert the MMI values to PGA values, a power law relationship is used in the ShakeMap model (Wald et al., 1999). For the range V ≤ MMI ≤ VIII, the power law equation is: