- Ground-motion model is:
where Y is in g, a = -1.632, b = 0.304, c = -1, h = 2.7, e = 0 and σ = 0.275.

- Use two site categories:
- Soil
- V
_{s,30}≤ 750m∕s, Γ = 0. - Rock
- V
_{s,30}> 750m∕s, Γ = 1.

- Note that amount of data available for the Umbria-Marche area in central Italy is sufficiently large to perform statistical analysis at regional scale.
- Focal depths between 2 and 8.7km. Exclude data from an earthquake that occurred at 47km.
- Select only records from earthquakes with M
_{L}≥ 4.5 recorded at less than 100km. - Exclude data from Nocera Umbra station because it shows a strong amplification effect due to the presence of a sub-vertical fault and to highly fractured rocks.
- Uniformly process records using BAP (Basic strong-motion Accelerogram Processing software). Instrument correct records and band-pass filter records using a high-cut filter between 23 and 28Hz and a bi-directional Butterworth low-cut filter with corner frequency of 0.4Hz and rolloff parameter of 2.
- Note that can use M
_{L}because it does not saturate until about 6.5 and largest earthquake in set is M_{L}= 5.9. - More than half of records are from earthquakes with M
_{L}≤ 5.5. - State that equations should not be used for M
_{L}> 6 because of lack of data. - Use similar regression method as Ambraseys et al. (1996) to find site coefficient, e.