- Ground-motion model is:
where A is in cm∕s2, A and B so PGA becomes independent of magnitude at fault rupture, H is depth of point on fault plane when R becomes closest distance to fault plane, C

_{m}= 0.627, C_{h}= 0.00671, C_{d}= 2.212, C_{o}= 1.711 and σ = 0.211. - Focal depths < 100km.
- Convert records from sites with V
_{s}< 300m∕s into records from sites with V_{s}> 300m∕s using 1-D wave propagation theory. - Introduce term C
_{h}H because it raises multiple correlation coefficient for PGA. - Note equations apply for site where 300 ≤ V
_{s}≤ 600m∕s.