Robert B. Darragh
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View article: NGA-Subduction research program
NGA-Subduction research program Open
This article summarizes the Next Generation Attenuation (NGA) Subduction (NGA-Sub) project, a major research program to develop a database and ground motion models (GMMs) for subduction regions. A comprehensive database of subduction earth…
View article: Expert Panel Recommendations for Ergodic Site Amplification in Central and Eastern North America
Expert Panel Recommendations for Ergodic Site Amplification in Central and Eastern North America Open
The U.S. Geological Survey (USGS) national seismic hazard maps have historically been produced for a reference site condition of VS30 = 760 m/sec (where VS30 is time averaged shear wave velocity in the upper 30 m of the site). The resultin…
View article: Squeezing Kappa (<i>κ</i>) Out of the Transportable Array: A Strategy for Using Bandlimited Data in Regions of Sparse Seismicity
Squeezing Kappa (<i>κ</i>) Out of the Transportable Array: A Strategy for Using Bandlimited Data in Regions of Sparse Seismicity Open
The κ parameter (Anderson and Hough, 1984), and namely its site-specific component (κ0), is important for predicting and simulating high-frequency ground motion. We develop a framework for estimating κ0 and addressing uncertainties under t…
View article: Spectral characteristics of small magnitude earthquakes with application to western and eastern North American tectonic environments : surface motions and depth effects
Spectral characteristics of small magnitude earthquakes with application to western and eastern North American tectonic environments : surface motions and depth effects Open
The band-limited-white-noise model employed in the WES-RASCAL computer program was used to predict response spectral shapes for smallmagnitude earthquakes (moment magnitude (m sub w)=approx. 5.3 to 2.5) in both eastern and western North Am…
View article: Semi-automated procedure for windowing time series and computing Fourier amplitude spectra (FAS) for the NGA-West2 database
Semi-automated procedure for windowing time series and computing Fourier amplitude spectra (FAS) for the NGA-West2 database Open
This document introduces and describes the data processing methods developed for computing Fourier amplitude spectra (FAS) in the NGA-West2 project. The products of this study can be used to estimate high-frequency attenuation, kappa (κ), …