Deep Seismic Sounding of the Earth’s Crust and Upper Mantle

I Deep Seismic Sounding and Its Relation to Other Seismic Methods.- § 1. Development of Crustal Studies and Deep Seismic Sounding.- § 2. The Role of Deep Seismic Sounding among Other Seismic Methods.- § 3. Primary Methods of Studying the Crust and Upper Mantle.- § 4. Stages in the Development of Deep Seismic Sounding.- II Signals and Their Frequency Content.- § 1. Recorded Frequencies.- § 2. Shooting Efficiency.- § 3. Shot Spectra on Land and at Sea.- § 4. Effect of Attenuation in the Crust on the Spectrum of Deep-Traveling Waves.- § 5. Spectra of Microseisms and Optimum Frequency Bands.- § 6. Signals Recorded in Deep Seismic Sounding and in Seismological Profiling.- III Field Techniques and Resolution in Deep Seismic Sounding.- § 1. Recording Layout.- § 2. Areas for Recording the Principal Groups of Deep-Travelling Waves.- § 3. Optimum Ranges for Recording Deep Reflections.- § 4. Resolution in Deep Seismic Sounding.- § 5. Applicability of Deep Seismic Sounding and Seismological Profiling to Subdivision of the Earth’s Crust.- IV Wave Propagation and Models for the Medium.- § 1. Properties of Records, Identifiable and Correlatable Waves for Various Forms of Profiling.- § 2. Nature of the Wave Field.- § 3. Types of Waves.- § 4. Interference Zone in the Vicinity of the Critical Point.- § 5. Models of the Crust.- V Wave Propagation in Crusts of Various Types.- § 1. Characteristics of Wave Propagation for the Principal Crustal Types.- § 2. Regional Classification by Seismic Wave Fields.- § 3. Summary Travel Time Curves for Various Tectonic Zones in a Continental Crust.- VI Types and Structures of the Crust.- § 1. New Ideas on the Structure of the Earth’s Crust and Upper Mantle.- §2. Average Velocity Characteristics for the Crust and theM-Discontinuity.- § 3. Types and Structures of the Crust of Various Orders.- § 4. Nature and Cause of Layering in the Crust and Upper Mantle.- Conclusions.- § 1. The Deep Seismic Sounding Method.- §2. Relationship of Deep Seismic Sounding to Other Methods.- References.