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Chapter 7:Hazard Analysis—Earthquakes <br /> 7.3.1.1 Design Seismic Hazard <br /> The 2003 or 2006 International Building Code (IBC) defines seismic hazard using two series <br /> of maps indicating 0.2 second and 1.0 second spectral acceleration ordinates having a 2% <br /> probably of exceedance in 50 years with an implicit adjustment for a deterministic Maximum <br /> Considered Earthquake(MCE)within each seismic source zone. The applicable maps for the <br /> Hawaiian Islands are shown in Figure 7-11 for a rock site (Site Class B). The design spectral <br /> accelerations for a given site are 2/3rds of the MCE level shown in these maps. If required, <br /> the accelerations are modified,usually amplified, by the soil conditions underneath the site, if <br /> conditions other than rock exist. The IBC incorporates vastly improved seismic hazard <br /> mapping of Hawaii compared to previous standards, developed by the U.S. Geological <br /> Survey(USGS) and the Hawaii State Earthquake Advisory Committee. <br /> 7-13 Hawaii Countv Multi-Hazard Mitigation Plan <br />