NGA-West2 Ground Motion Model for the Average Horizontal Components of PGA, PGV, and 5% Damped Linea

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NGA-West2 Ground Motion Model for the Average Horizontal Components of PGA, PGV, and 5% Damped Linear Acceleration Response Spectra

Kenneth W. Campbella)

M.EERI, and Yousef Bozorgniab)

M.EERI

We used an expanded PEER NGA-West2 database to develop a new ground

motion prediction equation (GMPE) for the average horizontal components of

PGA, PGV, and 5% damped linear pseudo-absolute acceleration response spectra

at 21 periods ranging from 0.01 s to 10 s. In addition to those terms included in

our now superseded 2008 GMPE, we include a more-detailed hanging wall

model, scaling with hypocentral depth and fault dip, regionally independent geometric

attenuation, regionally dependent anelastic attenuation and site conditions,

and magnitude-dependent aleatory variability. The NGA-West2 database provides

better constraints on magnitude scaling and attenuation of small-magnitude

earthquakes, where our 2008 GMPE was known to be biased. We consider our

new GMPE to be valid for estimating horizontal ground motion from shallow

crustal continental earthquakes in an active tectonic domain for rupture distances

ranging from 0 km to 300 km and magnitudes ranging from 3.3 to 7.5–8.5,

depending on source mechanism. [DOI: 10.1193/062913EQS175M]

 

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