Earthquakes and Ground Motions - Earthquake Engineering for Structural Design - page 281

500 years
2500 years
(b)
Figure 7.56 Return periods for interplate and intraplate earthquakes (USA):
(a) For some selected cities (USGS , 2008); (b) Memphis (intraplate) and San
Francisco (interplate ) return periods (Gioncu, 2006)
the hazard curves for these selected cities. Figure 7.56b selects these curves for two
cities: Memphis in the Eastern USA and San Francisco in the Western USA. The
differences in accelerations are very high (MEM/SF = 24%), but this difference
decreases for a return period of 2500 years (MEM/SF = 81%). One can notice that,
if a return period of 500 years gives rise to low or moderate earthquakes, but in