In the evaluation of soil behavior due to earthquake motions, uniform intensity load cycles are frequently used instead of irregular-patterned loadings generated during actual earthquakes. A statistical conversion procedure is discussed in this paper based on results available in the literature. The actual irregular stress-time history produced by an earthquake can be represented by uniform amplitude cyclic stresses, although there may be considerable uncertainty associated with them. The statistical relationship proposed here between the earthquake magnitude and the equivalent uniform stress cycles is somewhat different from the relationship commonly used in practice. It is observed in this study that this discrepancy may not yield significant differences in estimating the soil strength in a liquefaction study. However, this variation should not be overlooked in other soil dynamics problems involving earthquake loading
