Data Set Size Key Data Set Issues AS

Key Data Set Issues A&S C&B C&Y B&A Idriss Chi-Chi MS yes yes no

Site Models A&S C&B C&Y B&A Idriss Vs 30 Yes yes Soil category No

Source Parameter Models A&S C&B C&Y B&A Oversaturation with mag Through correlation w/AR no

Issues from Dec 2004 • Oversaturation – Is it real? – Is it due

A&S changes • Use new non-linear soil functional form – Addressed cross over level

Slides: 21

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Data Set Size

Key Data Set Issues A&S C&B C&Y B&A Idriss Chi-Chi MS yes yes no Chi-Chi AS yes no no no Koceali & Duzce yes Yes For soil amp yes yes Ducze Lamont Sta yes no yes yes Dist Range 0 -130 0 -200 0 -300

Site Models A&S C&B C&Y B&A Idriss Vs 30 Yes yes Soil category No No no no Yes Geomatrix A, B, C, D Z 1. 0 or Z 1. 5 Yes, Z 1. 0 Yes, Z 1. 5 Z 1. 0 Will evaluate ? Empirical non-linear No no yes Will evaluate ? Model driven nonlinear Yes yes For cutoff vs only basin ? ? ?

Source Parameter Models A&S C&B C&Y B&A Oversaturation with mag Through correlation w/AR no no No(M 1) Yes (M 2) Aspect ratio Yes no no Style-of-faulting Yes yes planned Dip Yes, in HW Yes In HW ? Hypo depth no no no ? HW/FW Yes rjb Planned Yes using rjb Static stress drop no no no Buried/surface No yes no Depth to top of no no yes Idriss

Issues from Dec 2004 • Oversaturation – Is it real? – 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?

A&S changes • Use new non-linear soil functional form – Addressed cross over level • Added HW factor – Function of dip and Rjb

Site Amplification for PGA (EPRI model)