Some technical aspects of refraction seismic prospecting in the Sahara

Abslract: The refraction method of seismic exploration was initiated in 1952 in the Northern Sahara after several difficulties were encountered with the reflection method. The first tests showed the existence of a deeper marker bed having a velocity of about 6,000 m/set (20,000 ft/sec) which later proved to be the eroded surface of the basement. Now refraction can be employed, at least in certain regions, in detailed surveys although many difficul-ties in interpretation still exist. Both field practices and methods of interpretation are discussed