Belgar Engineering Consultants;
Gabriel García Márquez 9;
Collado-Villalba;
28400;
Spain;
ESTEYCO;
Menéndez Pidal 17;
Madrid;
28036;
Spain;
Principia Engineering Consuxltants;
Velázquez 94;
Madrid;
28006;
Spain;
Sonic logging; Slow formation; Shear wave velocity; Poisson’s ratio; P-wave packet;