SUBJECT INDEX 



973 



Displacements of rocks, 928-930, 933 



Disseminations, 162, 623, 628, 632, 659, 

 660, 677, 705, 802 



Dissipation of seismic energy, 481, 482, 

 483 



Dissociation, 633, 637 



Disturbance vector (see Vector, anom- 

 alous) 



Diurnal variation: 



- of gravity field, 163, 164 



- of magnetic field, 41, 42, 331, 366. 



367-371 

 Divining rod, 3 

 Dolerite: 



density of -, 76 - 



radioactivity of -, 874 



susceptibility of -, 314 

 Dolomite: 



density of -, 80, 84 



dielectric constant of -, 666 



radioactivity of -, 875 



specific heat of -, 848 



susceptibility of -, 310, 312 

 Domes (see Anticlines) 

 Doublet, electrical, 672, 673, 697, 722, 

 723 810 



xnagnet'ic -, 19, 384, 387, 778 

 Drain pipes, magnetic effect of, 374 

 Drill casing: 



magnetic effect of -, 374, 375 



plastic -, 491 

 Drill holes (see Wells) 

 Drill rigs, 490, 491, 842 

 Drill rods, magnetization of, 317 

 Drill, rotary, 20, 490, 491, 842, 899 

 Drilling mud and drilling fluid, 827- 



835, 857 

 Dynamic magnification (see Magnifica- 

 tion, dynamic) 

 Dynamic response (see P'requency re- 

 sponse) 

 Dynamic testing: 



- of rock specimen, 460-464 



- of soils, 9, 36, 58, 62, 911, 914-928 



- of structures, 9, 58, 62, 911, 914-928 

 Dynamite: 



- charges, placement of, 489, 490, 550, 



551, 569-571 

 consistency of -, 486 

 cpst of -, 486 

 density of -, 485 

 freezing resistance of -, 486 

 inflammability of -, 487 

 kinds of -, 484-485 



- magazines, 487 



propagation effectiveness of -, 485 

 rate of detonation of -, 485-486 

 safety of -, 486, 487 



- as source of seismic energy, 7, 20, 



484 

 Dynamo-metamorphic : 



- deposits, 41, 42, 49, 414 



- effects, 317, 475, 476 



E 



Eagleford formation, 285 

 Ear, sensitivity of -, 937 

 Earth: 

 figure of -, 89, 95-97, 169 

 gravity field of - (see Gravity field) 

 magnetic field of - (see also Total in- 

 tensity. Vertical intensity, and 

 Horizontal intensity), 16, 19, 293, 

 295, 296, 299, 301, 303, 307, 309, 

 316, 317, 320 

 mass of -, 87, 90 

 rotational velocity of -, 89 

 Earth currents, 372 



Earth inductor, 40, 358-363, 366, 403, 866 

 Earth inductor compass, 363, 866 

 Earth magnetism, elements of, 295 

 Earthquakes, 3, 63, 317, 440 

 damages of -, 9, 910, 912, 913, 918 



- vibrations, 36, 910, 912, 913, 918 



- waves (see also Seismic Waves) 



450-452 



Echo, depth sounding, (see Echo sound- 

 ing) 



Echometer, 867, 936, 942, 943, 954 



Echo sounding, 9, 36, 37, 41, 59, 63, 64, 

 942, 943, 945, 946, 947, 950-957 



Eclogite, density of, 81 



Edwards limestone, Texas, 285 



Effusion, 905 



Elastic: 



- coefficients, 443, 445, 446 



- constants (see - moduli) 



- deformations, 441-449 



- moduli, 442-446, 911, 926, 927 

 complex -, 482, 483 



- of formations in place, 911, 926, 927 

 laboratory determinations of -, 



452^64 



- of minerals, 467 



- of rocks, 467 



- units and conversion, 452-454 



-, variation with pressure, 474, 934 



- properties, factors affecting, 474-477 



- waves (see Seismic waves) 

 Elasticity: 



factors affecting -, 474-477 

 -of rocks, 4, 452-473 

 theory of -, 442-448 

 Electric (al): 



- anisotropy (see Anisotropy, electric) 



- conductivity (see Conductivity) 



- field, 7, 25, 26, 30, 619, 621, 622,633, 



640, 641, 652-654, 671-673, 681-692, 

 694, 697-699, 810-813, 815-818 

 -, A. C, 685-692 



horizontal component of -, 652-654 

 normal -, 682, 683, 693, 694 

 potential of - (see Potential, elec- 

 tric) 

 quadrature component of -, 687, 

 690, 695, 696 



