- 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, Cm = 0.627, Ch = 0.00671,
Cd = 2.212, Co = 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
- Introduce term ChH because it raises multiple correlation coefficient for PGA.
- Note equations apply for site where 300 ≤ V s ≤ 600m∕s.