Velocity heterogeneities in the lithosphere of the Fennoscandian (Baltic) shield

The velocity structure of the lithosphere in the Fennoscandian Shield is of great interest for two main reasons: classical problems in the study of the Earths deep structure and the problems in the definition of promising zones which display their mineralogenic features. To solve these problems, seismic tomography methods are commonly used to approach the inverse linearized 3D kinematic problem of seismic study. These methods have been developed since the 1960s, and they are now extensively employed for solving both the deep seismic sounding (DSS) and seismological problems.