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Developer Scope. Ground Motion Model (median, standard dev) Ground Motion Parameters: Horizontal components (Ave Horiz, FN, and FP) PGA, PGV, PGD Pseudo spectral acc at 5% damping: 0-10 sec Applicable Magnitude Range: 5.0 - 8.5 (SS) 5.0 - 8.0 (RV) Applicable Distance Range: 0 - 200 km
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Developer Scope • Ground Motion Model (median, standard dev) • Ground Motion Parameters: • Horizontal components (Ave Horiz, FN, and FP) • PGA, PGV, PGD • Pseudo spectral acc at 5% damping: 0-10 sec • Applicable Magnitude Range: • 5.0 - 8.5 (SS) • 5.0 - 8.0 (RV) • Applicable Distance Range: • 0 - 200 km • Fault Types • Strike-slip, Reverse, Normal • Site Classification Scheme • Developers select their preferred classification scheme • Need not include soft-soil
Key Issues • Oversaturation • Is it due to the aspect ratio, or the magnitude? • Use of Aspect ratio • Are aspect ratios used in NGA consistent with aspect ratios currently used in hazard analyses? • Correlation with style-of-faulting • Dependence on dip • Is this dip effects or a regional effect?
Key Changes from Previous Models • Site classification • Vs30 • Depth of soil term (Z1.0 or Z1.5) • Source • Oversaturation with magnitude • Aspect ratio as a key parameter • Non-linear site response • Based on median rock PGA including event term
T=1 sec Vs=600 C&Y w/o AR
T=1 sec SS Vs=600 C&B w/o AR
T=1 sec SS Vs=600 A&S AR<=2
T=1 sec SS Vs=600 A&S
PGA Hazard Vs=600 Site near Hayward Fault (2 km)
T=1 sec Hazard Vs=600 Site near Hayward Fault (2 km)
PGA Hazard Vs=600 Site near San Andreas Fault (2 km)
T=1 Sec, Hazard Vs=600 Site near San Andreas Fault (2 km)