- Ground-motion model is:
where PGA is in cm∕s2. For Bucharest azimuth b′ = -0.21056, b

_{M}= 1.29099, b_{R}= -0.80404, C = 40 and σ = 0.52385, for Valeni azimuth b′ = -1.52412, b_{M}= 1.42459, b_{R}= -0.70275, C = 40 and σ = 0.51389 and for Cherna Voda b′ = 4.16765, b_{M}= 1.11724, b_{R}= -1.44067, C = 40 and σ = 0.47607. - Focal depths, h, between 89 and 131km.
- Incomplete data on local site conditions so not included in study.
- Some strong-motion records are not from free-field locations.
- Uses ρ to characterise the non-homogeneity of region. Includes effect of instrument location w.r.t. the main direction of propagation of seismic energy, as well as the non-homogeneous attenuation in two orthogonal directions. ρ = where α is angle between instrument and main direction of seismic energy or direction of fault projection on surface and a is parameter defining the non-homogeneous attenuation in two orthogonal directions, or relation between the semi-axes of the ellipse of seismic field.
- Uses a two step method. In first step derive equations for each earthquake using lnPGA = b′
_{0}+b_{1}ln(R_{e}∕ρ). In the second step the complete Ground-motion model is found by normalizing separately for each earthquake with a value of ρ defined for that earthquake according to the location for which the equation was defined. - Notes that there is limited data so coefficients could be unreliable.
- Strong-motion records processed by different institutions.