1192 



EXPLORATION GEOPHYSICS 



Seismic drilling equipment, 872-886 

 cost of, 885, 886 



drills, drill rods and bits, 880, 881 

 hydraulic feed type drill, 872-878 

 mechanical feed type drill, 878, 879 

 portable drills, 881, 882, 883 

 rotary drill, 872 

 water truck, 882, 883, 884 

 Seismic-electric effect, 554 

 Seismic field operations, 842-855 



amount and depth of explosive {see also 



Explosives), 849, 850 

 drilling crews, 885 

 end shots, 696, 698 

 exploration crew, 843-845 

 exploration, responsibility and planning, 

 911-916 



briefing, 914 



execution, 914, 915 



integration, 914, 915 



preparation, 913 



review, 915, 916 

 field methods for improving detection of 



reflections, 853-855 

 helicopters in, 848, 849 

 offshore operations {see Seismic offshore 



operations), 898-905 

 seismometer spreads, 951, 953 

 shot-hole, 863, 872, 885 



multiple, 855 

 transportation and communication, 845-849 

 Seismic filters, 808, 822, 833, 834 

 effects of, 823-825 

 frequency patterns, 835 

 Seismic interpretation: 



average dip and strike, 696 

 average reflection time, 695 

 computing form, 692-696 

 multiple reflections, 891-895 



in air shooting, 895-897 

 of depth, horizontal distance and dip, 695 

 of recorded reflection, 699-702 

 reflection grade, 692 

 time measurements, 692-695 

 vector resultants, 695 

 wave front chart, 685-687 

 Seismic investigation of soil dynamics, 925-929 

 operating principle, 926-928 

 sonic method, 928 

 Seismic mapping, 738-750 



cross-sections and maps, 744-747 

 faults, 738, 739 



grading of reflections, 743, 744 

 Graphical Analogue Computer in, 747-750 

 interval change method, 739-743 

 Seismic methods: 



air shooting {see Air shooting), 887-891 

 application of, 855, 856 

 continuous profiling, 736-738 



correction for, 737 

 correlation shooting {see Correlation shoot- 

 ing), 702-709 

 cost of, 37 



Seismic methods (continued) 



depth, horizontal distance and dip computa- 

 tions, 695, 696 



direct wave, 651 



dip shooting {see Dip shooting) 



drilling equipment for {see Drilling equip- 

 ment), 886 



field operations {see Seismic field operations) 



frequency pattern correlation, 835 



history of, 11, 12, 13 



mapping {see Seismic mapping) 



multiple detection method, 853, 854 



multiple shot-points method, 855 



operating principle, 649 



overlapping seismometer output method, 864 



physical principles, 650, 651 



recording equipment for {see Seismic record- 

 ing equipment) 



reflection method {see Reflection method), 

 670-729 



refraction method {see Refraction method), 

 729-779 



relation to seismology {see also Seismology), 

 639 



soil dynamics investigation {see Seismic in- 

 vestigation of soil dynamics) 



special applications {see Seismic shallow pros- 

 pecting) 



velocity shooting {see Velocity shooting), 728 

 Seismic offshore operations, 898-905 



boats, 904, 905 



cost of, 905 



instrumentation, 898-900 



interpretation for, 903, 904 



operations, 904, 905 



surveying, 902, 903 



water shooting, 900-902 

 Seismic patents, 930-937 

 Seismic recording equipment: 



amplifiers, 810, 811, 812 



filters, 808 



Galvanometer {see Galvanometer) 



marsh buggy, 846, 847 



photographic, 818-822 



portable equipment, 836, 838, 839 



recording cameras, 817, 818 



recording papers, 818, 819 



seismometer {see Seismometer) 



shooting blasters, 859-863 



Sonograph equipment, 825-828 



testing of, 841, 842 



trucks and reels, 837, 839, 840, 841, 846, 847 



Variable-area recording, 823-832 



Variable-area reproducer, 823 



Variable density camera, 826 

 Seismic shallow prospecting, 916 



instruments and methods, 917 



of buried channel, 923-925 



of Cedar Bluff dam site, 923-925 



of Del Norte dam site, 918-920 



of Elkader dam site, 921-923 

 alternate No. 2, 922 

 pyramids dam site, 923 



