a	Load eccentricity from the soil (m);
b	Width of the rod (m);
c	Distance of the lateral force from the tip of the rod (m);
d	Adjustment static length (m);
$d^{\prime }$	Adjustment dynamic length (m);
D	Embedded length of the rod (m);
$D_{50}$	Average grain diameter (mm);
$E_b$	Young modulus of the rod (MPa);
$E_m$	Ménard modulus of the soil (MPa);
$K_s$	Modulus of subgrade reaction (MPa);
f	First frequency (Hz);
h	Thickness of the rod (m);
H	Exposed length of the rod (m);
$I_b$	Inertia of the rod in the vibration direction (m4);
L	Total length of the rod (m);
$L_{es}$	Equivalent static length (m);
$L_{ed}$	Equivalent dynamic length (m);
M	Mass of the rod (kg);
m	Mass of the accelerometer (kg);
S	Section of the rod (m2);
$\alpha$	Rheological parameter of the soil (-);
${\rho }_s$	Bulk density of the soil (kg.m−3);
${\rho }_b$	Bulk density of the rod (kg.m−3);