- Ground-motion model is:
where c

_{i}(T) is the station coefficient, reflecting the relative site effect for each period, assuming zero mean for all stations. - Response parameters are acceleration and velocity for 5% damping.
- Depths between 1 (includes earthquakes with depths reported as 0km) and 158km. Exclude earthquakes with focal depths greater than 200km.
- Exclude records with vectorial composition of PGA less than 0.01m∕s2.
- Exclude data from stations which have recorded less than two records, because the station coefficient could not be determined adequately. Use records from 823 stations.
- Most records from distances between 50 and 300km.
- Use three-stage iterative partial regression method.
- For T ≥ 5s constrain horizontal anelastic coefficient to zero because get positive coefficient.