NGA-West2 Equations for Predicting PGA, PGV, and 5% Damped PSA for Shallow Crustal Earthquakes
David M. Boore,a) Jonathan P. Stewart,
M.EERI, Emel Seyhan,c)
M.EERI,
and Gail M. Atkinson,d)
M.EERI
We provide ground motion prediction equations for computing medians
and standard deviations of average horizontal component intensity measures
(IMs) for shallow crustal earthquakes in active tectonic regions. The equations
were derived from a global database with M 3.0–7.9 events. We derived equations
for the primary M- and distance-dependence of the IMs after fixing the
VS30-based nonlinear site term from a parallel NGA-West2 study. We then evaluated
additional effects using mixed effects residuals analysis, which revealed no
trends with source depth over the M range of interest, indistinct Class 1 and 2
event IMs, and basin depth effects that increase and decrease long-period IMs for
depths larger and smaller, respectively, than means from regional VS30-depth relations.
Our aleatory variability model captures decreasing between-event variability
with M, as well as within-event variability that increases or decreases with
M depending on period, increases with distance, and decreases for soft sites.
[DOI: 10.1193/070113EQS184M]
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boore2014.pdf