Non-Ergodic Site Response in Seismic Hazard Analysis

• DOI: 10.1193/081716eqs135m
• Publication Date: 2017-05-01T14:04:13Z
• Authors: Jonathan P. Stewart; Kioumars Afshari; Christine A. Goulet
• Keywords: 0211 other engineering and technologies; 02 engineering and technology

Probabilistic seismic hazard analyses are usually performed with semi-empirical ground motion models (GMMs) following the ergodic assumption whereby average source, path, and site effects from global databases apply for a specific of interest. Site-specific response is likely to differ conditional on parameters used in GMMs (typically V S30 basin depth). Non-ergodic can be evaluated using on-site recordings and/or one-dimensional wave propagation analyses, allows site-to-site variability removed within-event standard deviation. Relative ergodic, non-ergodic often reduce motions at long return periods. We describe procedures replacing term nonlinear mean over its appropriate range periods (returning outside that range). also present computing deviation by removing while considering soil nonlinearity. illustrate application these procedures, their effect curves uniform spectra, as implemented OpenSHA.