- Ground-motion model is:
- Use records from sites with V
_{s,30}≥ 500m∕s. - Use the NGA Flatfile.
- Response parameter is acceleration for 5% damping.
- Data divided into magnitude intervals of: 5.0–5.4, 5.5–5.9, 6.0–6.4, 6.5–6.9 and 7.0–7.5 and distance intervals of: 0–2.9km, 3.0–9.9km, 10–29.9km, 30 - 59.9km, 60-99.9km, 100–200km and > 200km. Use weighted regression with weights given by inverse of number of records in each magnitude-distance bin since most data from moderate earthquakes at intermediate distances.
- Compute C
_{5}and C_{6}using data from six earthquakes: 1979 Imperial Valley (M6.53), 1980 Livermore (M5.42), 1989 Loma Prieta (M6.93), 1992 Landers (M7.28), 1999 Hector Mine (M7.13) and 2004 Parkfield (M5.9).