- Ground-motion model is:
- Response parameters are pseudo-acceleration, PSA, and pseudo-velocity, PSV, for 5% damping
^{3}. - Use three soil conditions (revised when cross hole information was available):
- S = 0
- Hard and rock sites, 50 records.
- S = 1
- Intermediate soil, 10 records.
- S = 2
- Soft soil, 12 records.

- Use M
_{L}because most suitable for distance range of majority of records. - Try including c
_{5}S term but find low significance values for c_{5}. Repeat regression for each soil category separately. Give results when coefficient of determination R^{2}> 0.80, standard errors < 25% and coefficients have high significance levels. - For PSA for S = 0 give coefficients for all periods, for S = 1 give coefficients for 0.17 to 0.2s and for S = 2 give coefficients for 1 to 10s.
- Also consider Friuli records (4.2 ≤ M
_{L}≤ 6.5, epicentral distances between 2 and 192km, 14 records for S = 0, 23 records for S = 1 and 16 records for S = 2). - Note need to include term in model reflecting explicitly local amplification dependent on natural period of soil as well as predominant period of incident radiation to bed rock.

^{3}Although coefficients should only differ by a constant because PSA = (2π∕T)PSV they do not; hence response parameters are
probably not those stated.