SUBJECT INDEX 



1193 



Seismic shooting {see Explosives, Drilling equip- 

 ment, Velocity, Air and Water shooting) 

 Seismic wave analysis, 822, 823 

 filtering, effects on, 823-825 

 frequency wave analysis, 829-835 

 Mirragraph, 830-835 

 pattern correlation, 835, 836 

 Geovision, 828 

 Sonograph, 825-828 

 Seismic wave velocity determination, 681 

 by up-hole shooting, 718-720, 737 

 computation charts, 687 

 for representative materials (Table 20), 658, 



659, 660 

 in low velocity layer, 714, 715, 719-723 

 in relation to elastic constants, 658, 659 

 linear increase with depth, 683-687 

 method of least squares, 682, 727, 728 

 of elastic waves, 658, 659 

 travel time curve (see Travel-time curve) 

 velocity-depth function, 681-683, 687 

 velocity shooting methods {see Velocity shoot- 

 ing) 

 Seismic waves (phases) : 

 amplitude of, 652-656 

 curved ray path, 675 

 curvature of reflecting interface, effect on, 



733-735 

 direct, 651, 751 



distribution of energy in, 651-657 

 elastic, 649-658 

 energy of, 656, 658 

 filtering, 808 

 -front, 659, 661, 671 

 generation of {see also Explosives), 856-872 



by mechanical means, 856, 857 

 instrumental analysis of, 722-836 

 longitudinal {see Longitudinal waves) 

 Love, 640 

 -length, 663 

 -paths {see also Reflected and Refracted ray 



path), 659 

 propagation of {see Explosives), 661-663 

 -ray, 661 

 Rayleigh, 640 

 recorded, 699-702 

 reflection of {see also Reflection and Reflected 



wave), 650, 663-665 

 refraction of {see also Refraction and Re- 

 fracted wave), 663-665 

 surface-, 651, 667 



seismometer spread in relation to, 853 

 traverse, {see Traverse waves) 

 velocity of {see also Seismic wave velocity 



determination), 658-659, 666-670 

 wave front chart, 685, 686 

 Seismogram: 



from air shooting, 896, 897 



from reflection method, 691-693, 699-703, 706, 



709, 710, 743, 744 

 from refraction method 721, 722, 770, 774, 



824, 828 

 from earth seismology, 647-649 



Seismographic parties, 13 



geological distribution of, 14 

 Seismology, 642-649 



early instruments, 642, 643 

 present instruments, 644, 645, 646 

 relation to Seismic prospecting, 639-642 

 seismogram, 644, 647 

 travel-time curve in, 648 

 Seismometer, 779-808 

 accelerometers, 780 

 carbon button type, 803 

 carrier current systems, 805 

 classification, 779, 780 

 conditions affecting design, 781 

 damping, electromagnetic, 784, 785, 786 

 displacement type, 780 

 effects of ground motion, 787-792 

 effects of natural frequency of, 792, 793 

 electronic type, 804 

 electrostatic (capacity) type, 802 

 field disturbance, 850, 851 

 for velocity well shooting, 731 

 frequency response, 787, 788 

 fundamental theory, 782-786 

 hot wire resistance type, 803 

 mechanical types {see Mechanical seismome- 

 ter), 805-808 

 moving conductor type, 646, 793-796 

 multiple detection with, 853, 854 

 overlapping output, 854 

 photoelectric type, 804 

 piezoelectric type, 801, 802 

 spread, 672, 696-699, 850, 851 

 variable reluctance type, 796-801 

 variable reluctance electromagnetic type, 644- 



646 

 velocity-type, 780 

 Self-Potential electrical method, 444-456 

 electrodes in, 446 

 equipotential line, location of, 446, 447 



field equipment and procedure, 445-450 



interpretation of studies, 451, 453 



operating principle, 444, 445 



potentials, measurement of, 448, 449 

 variations, 449 



surveys, 453-456 



traverses across vein conductors, 450 



utilization of telluric currents, 455 

 Self- Potential logging: 



complementary application with resistivity, 

 1050-1054 



electrochemical potentials, 1040, 1073 



electrode arrangements, 1048-1050 



electrofiltration potentials, 1038, 1039 



history of, 1038 



in limestone fields, 1045-1048 



in shaly sands, 1044, 1045 

 base line shift of, 1045 



in soft formations, 1042-1045, 1047 



instrumentation, 1055-1057 



measurement of S.P., 1048-1050 



static S.P. diagram, 1041, 1042 



