Campbell

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Campbell BozorgniaNGA Ground-Motion Relation

• NGA Workshop 8
• April 12, 2005

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Introduction

• Used latest flatfile dated March 21, 2005
• Extended distances from 60 to 200 km
• Excluded aftershocks
• Excluded poorly recorded events
• Aspect ratio (AR) not explicitly modeled
• Model captures observed trend with AR
• Used two-step nonlinear regression

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Modeling and Results

• Magnitude scaling decreases for M gt 6.5
• No over-saturation with magnitude is required
• Attenuation decreases with magnitude
• Buried reverse faults have high amplitudes
• Reverse-faulting factor increases with dip
• Normal-faulting somewhat lower than SS
• Nonlinear soil term from simulations
• Sigma nearly constant with magnitude

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