- Ground-motion model is:
where y is in g. For strike-slip earthquakes: b = 1.1, c

_{1}= 0, c_{2}= 2.5, for PGA at soil sites a = -2.611 and d = -1.75, for M < 6.5 h_{1}= 0.8217, h_{2}= 0.4814 and for M ≥ 6.5 h_{1}= 0.3157 and h_{2}= 0.6286, for PGA at rock sites a = -1.406 and d = -2.05, for M < 6.5 h_{1}= 1.353 and h_{2}= 0.406 and for M ≥ 6.5 h_{1}= 0.579 and h_{2}= 0.537. For reverse-slip increase predicted values by 20%. For M < 6.5 σ = 1.26 - 0.14M and for M ≥ 6.5 σ = 0.35. - Uses two site categories:
- 1.
- Soil
- 2.
- Rock

- Use two source mechanism categories:
- 1.
- Strike-slip
- 2.
- Reverse-slip

- Supplement data with significant recordings of earthquakes with focal depths < 20km from other parts of world.
- Different equations for M < 6.5 and M ≥ 6.5.