Page 377 - Whole Earth Geophysics An Introductory Textbook For Geologists And Geophysicists

359 114 velocity and, inter- interface, =
Seismic resolution, 129-32, 133 (figure) Seismic sections, 102, Seismic sources dynamite, 120 vibroseis, 53, 120 Seismic stratigraphy, 102 Seismic traces, 54, 56. See also Seismic waveforms acoustic impedance changes and > 118, 122-24 in common midpoint method, 106 frequency and 127-29 nents of, seismic signals and, input 118-22, 123, 118, noise and, 106, 107 stacked, (figure) Seismic velocity, 4, 11
Index 103 (figure) phase compo- 126-27 124-26 (figure), waves, 50-51, refracted arrival waves, 206-9, 116-17 travel-time plots, and, 64-66 (RMS), 115 and, 106, 139, horizontal 12, 15, 45-72 techniques for.

reflections from postdrift, 165-67 171 trench-fill, 168, Seismic acquisition, 102-6 by, 125-26 noise induced Seismic definition, 129-32, 133 (figure) Scismic measurements, 3—4 — Scismic processing, 106-18 in, 108-12 sequence general by, 125-26 induced noise 133-17 types of velocities in, Seismic pulses bandwidths, broad with 129-32 (figure) 124 minimum phase, 120, (waveform) of, 120-22 width pulse zero

critically. See Critically refracted wayes shear, 57, 58 (figure) length. See spread Refraction Spread length surveys, 81-84 Refraction isostasy, 241-43 Regional Relative gravity, 234, 235-37 Remanent magnetization, 5, 292-93, 296, 297-300 (figure) chemical, 300, 30) (figure) detrital, 300, 301 (figure) thermo, 300, 301 lithosphere slab, 324 Remnant (figure) zones, 325 subduction Remnant 10 Resolution, polar

gravity and, 260 hydrostatic, 238 isostasy and, 238-39 lithostatic, 238 physical state of upper mantle and, 18-19 and, 3}-32 108 (figure), Primary reflections, 137,125... from, multiples distinguished 119 (figure) 106 Primary waves. See Compressional waves Processing. See Seismic processing Sound. 27 waves waves. See Compressional (figure), 29 Quartz, 51,318 Quartzite. 318, 319 (table) Radiation, 315

Pressure volcanism source of, Puget P Pyrenees, 22 Q R Radioactive Rayleigh 209 for and normal for face for shot vertical Reciprocal Redbeds. 300 Red Reduced

Ridge, 305 (figure) Paleolatitude studies, 300, 305-6 Paleomagnetic stratigraphy. 300, (figure) (figure). 29 Basin, 22 (figure), 24, 92. 265. 272. 275 (figure) (figure), 292, 178 margins. 21,77 anomalies for. 262. 267. interpretation 117 oscillation. 235 18-19, 20 (figure). 215 of, 345 composition of. 347 (figure) flow and. 321, 323 (table) 84 (figure) and, 32-34 bulge, 243 textures, 346-47 12

Pacific-Antarctic (figure) Northwest, 35 Pacific Ocean, 92 Plate, 30.31 302-5. 308 Paleomagnetic studies, 297-308 Pamirs. 22 Pannonian Paramagnetism, 291 297.300 melts, 18, 50, continental gravity (figure) 27) gravity at, 251-56 seismic reflection 163-68 in, 37, multiples, Pendulum Peridotite, chemical description magnetization of, 290, 291 in oceanic crust. seismic velocities of. 51 volcanism

P Pacific Pacific 199. Partial Passive Peg-leg heat Pine Plate 166 Plate heat blocks Potential Pratt

by seismic acquisition 125-26 lithosphere. 198. 146, 159 zones. rift 169-71.175 mechanism solutions for. (figure) raypaths. 102. 148 (figure) 143 (figure) 154 incidence sections. 111. (NMO) cartec- (figure). 110. 107 302 thickness in. 93 (figure) for. 272 maps (table) for, 321 in, 92 Plate. 36 (figure). 296. 297. 175 Dame Anticlinorium. reflections. faull-zone subduction (figure). See c

Index processing. 124,125 Nonuniqueness. 7 Normai continental (figure) faults. 25. 38, 200 (figure). 205 continental 200 (figure). 202 plate tectonics and, 201 incidence 146 (figure). anticlines and. bending effects in. 137-38 Normal! moveout 106, tions. (figure) polarity. North America anomaly flow values Moho depth American pole. 295 Nuclear tests. 53 Observed gravity. 226. 228.234 161-62 Oc

358 induced and natural. 324 Normal in flexural. focal Normal 142. Normal 11] Normal crustal gravity heat North North 300 Norway. 167 Notré Oo Occasional Ocean heat of, of. Ouachita Outer core.