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Chiou and Youngs PEER-NGA Empirical Ground Motion Model for ...

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RRUP = closest distance to the rupture plane (km)<br />

RJB = Joyner-Boore distance to the rupture plane (km)<br />

δ = rupture dip<br />

W = rupture width (km)<br />

ZTOR = depth to top of rupture (km)<br />

FRV = 1 <strong>for</strong> 30º ≤ λ ≤ 150º, 0 otherwise (combined reverse <strong>and</strong> reverse-oblique)<br />

FNM = 1 <strong>for</strong> -120º ≤ λ ≤ -60º, 0 otherwise (only normal earthquakes, normal-oblique<br />

considered to be the same as strike-slip.<br />

λ = rake angle<br />

VS30 = Average shear wave velocity <strong>for</strong> top 30 m (m/s)<br />

τ = inter-event st<strong>and</strong>ard error<br />

σ = intra-event st<strong>and</strong>ard error<br />

The coefficients of Equations (21a) <strong>and</strong> (21b) are listed in Table 5.<br />

C&Y2006 Page 45

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