NGA-West2 Equations for Predicting PGA, PGV, and 5% Damped PSA for Shallow Crustal Earthquakes

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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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