CONTENTS 



THE EARTH BENEATH THE SEA 



Section I. Geophysical Exploration ........ 



CH. 1. Elementary Theory of Seismic Refraction and Reflection 

 Measurements hy J. I. Ewing 



1. Introduction 



2. Reflected waves 



3. Refracted waves 



4. Computation of layer velocities and thicknesses 



5. Shear waves and complex refracted waves 



6. Some complications and deviations from sim]jle tiieory 



CH. 2. Refraction and Reflection Techniques and Procedure hy 

 G. G. Shor, Jr. 



1. Introduction 



2. Shooting technic|ues . 



3. Receiving techniques 



4. Plan of operations 



5. Miscellaneous variations 



6. Reflection methods 



CH. 3. Single-Ship Seismic Refraction Shootino hy M. N 



1. Introduction ...... 



2. Instrumentation ..... 



3. Operation ....... 



CH. 4. Continuous Reflection Profilinc l)y J. B. Hcrsey 



1. Introduction 



2. Design 



3. Operations at sea 



4. Results 



5. Interpretations . 



6. Geophysical measurements 



7. Concluding remarks 



CH. 5. The Unconsolidated Sediments hy 



1. Introduction 



2. Evidence for gradients and low -ve 



3. Variable angle reflections 



4. Normal-incidence reflections 



5. Summary .... 



/. /. EiritKj (1)1(1 

 locitv sediments 



Hill 



T. E. Nafe 



3 



3 

 3 

 3 



(') 

 ill 

 12 

 17 



20 

 20 

 21 

 24 

 31 

 34 

 35 



31) 

 39 

 41 



47 

 47 

 ni) 

 56 

 56 

 66 

 70 

 71 



73 

 73 



75 

 76 

 81 

 82 



XI 



