Earthquake Spectra· 2014Q1
Update of the Chiou and Youngs NGA Model for the Average Horizontal Component of Peak Ground Motion and Response Spectra
- 1,292citations
- Q1SCImago
- 2014year
Short summary
An updated NGA-West2 model refines predictions for horizontal ground motion amplitudes from shallow crustal earthquakes, showing similar median predictions for M > 7 but lower for M < 5 compared to the 2008 model, with increased aleatory variability.
AI-generated from the title and abstract; the full text is not read.
Key points
- Updated NGA-West2 model provides refined ground motion amplitude predictions for shallow crustal earthquakes.
- Model incorporates new terms for fault dip, rupture directivity, and regional attenuation/site effects.
- Median predictions are similar for M > 7 but lower for M < 5 compared to the 2008 NGA model.
- Aleatory variability in the updated model is larger than in the 2008 version.
AI-generated from the title and abstract; the full text is not read.
Abstract
We present an update to our 2008 NGA model for predicting horizontal ground motion amplitudes caused by shallow crustal earthquakes occurring in active tectonic environments. The update is based on analysis of the greatly expanded NGA‐West2 ground motion database and numerical simulations. The updated model contains minor adjustments to our 2008 functional form related to style of faulting effects, hanging wall effects, scaling with the depth to top of rupture, scaling with sediment thickness, and the inclusion of additional terms for the effects of fault dip and rupture directivity. In addition, we incorporate regional differences in far‐source distance attenuation and site effects between California and other active tectonic regions. Compared to our 2008 NGA model, the predicted medians by the updated model are similar for M > 7 and are lower for M < 5. The aleatory variability is larger than that obtained in our 2008 model.
The authors' abstract, as published at the source. Earthquake Spectra, 2014 · DOI ↗
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Field: Civil and Structural Engineering
Civil and Structural EngineeringEngineering