Introduction to Seismology
, by Peter M. Shearer- ISBN: 9780521882101 | 0521882109
- Cover: Hardcover
- Copyright: 7/20/2009
Preface to the first edition | p. xi |
Preface to the second edition | p. xiii |
Acknowledgment | p. xiv |
Introduction | p. 1 |
A brief history of seismology | p. 2 |
Exercises | p. 15 |
Stress and strain | p. 17 |
The stress tensor | p. 17 |
Example: Computing the traction vector | p. 19 |
Principal axes of stress | p. 20 |
Example: Computing the principal axes | p. 22 |
Deviatoric stress | p. 23 |
Values for stress | p. 24 |
The strain tensor | p. 25 |
Values for strain | p. 29 |
Example: Computing strain for a seismic wave | p. 29 |
The linear stress-strain relationship | p. 30 |
Units for elastic moduli | p. 32 |
Exercises | p. 33 |
The seismic wave equation | p. 39 |
Introduction: The wave equation | p. 39 |
The momentum equation | p. 40 |
The seismic wave equation | p. 42 |
Potentials | p. 46 |
Plane waves | p. 46 |
Example: Harmonic plane wave equation | p. 48 |
Polarizations of P and S waves | p. 48 |
Spherical waves | p. 50 |
Methods for computing synthetic seismogramså | p. 51 |
The future of seismology?å | p. 53 |
Equations for 2-D isotropic finite differenceså | p. 56 |
Exercises | p. 61 |
Ray theory: Travel times | p. 65 |
Snell's law | p. 65 |
Ray paths for laterally homogeneous models | p. 67 |
Example: Computing X(p) and T(p) | p. 70 |
Ray tracing through velocity gradients | p. 71 |
Travel time curves and delay times | p. 72 |
Reduced velocity | p. 73 |
The ¿(p) function | p. 73 |
Low-velocity zones | p. 76 |
Summary of 1-D ray tracing equations | p. 77 |
Spherical-Earth ray tracing | p. 80 |
The Earth-flattening transformation | p. 82 |
Three-dimensional ray tracingå | p. 83 |
Ray nomenclature | p. 86 |
Crustal phases | p. 86 |
Whole Earth phases | p. 87 |
PKJKP: The Holy Grail of body wave seismology | p. 88 |
Global body-wave observations | p. 89 |
Exercises | p. 98 |
Inversion of travel time data | p. 103 |
One-dimensional velocity inversion | p. 103 |
Straight-line fitting | p. 106 |
Example: Solving for a layer-cake model | p. 108 |
Other ways to fit the T(X) curve | p. 109 |
¿(p) Inversion | p. 110 |
Example: The layer-cake model revisited | p. 111 |
Obtaining ¿(p) constraints | p. 112 |
Linear programming and regularization methods | p. 115 |
Summary: One-dimensional velocity inversion | p. 117 |
Three-dimensional velocity inversion | p. 117 |
Setting up the tomography problem | p. 118 |
Solving the tomography problem | p. 122 |
Tomography complications | p. 124 |
Finite frequency tomography | p. 125 |
Earthquake location | p. 127 |
Iterative location methods | p. 133 |
Relative event location methods | p. 134 |
Exercises | p. 135 |
Ray theory: Amplitude and phase | p. 139 |
Energy in seismic waves | p. 139 |
Geometrical spreading in 1-D velocity models | p. 142 |
Reflection and transmission coefficients | p. 144 |
SH-wave reflection and transmission coefficients | p. 145 |
Example: Computing SH coefficients | p. 149 |
Vertical incidence coefficients | p. 149 |
Energy-normalized coefficients | p. 151 |
Dependence on ray angle | p. 152 |
Turning points and Hilbert transforms | p. 156 |
Matrix methods for modeling plane waveså | p. 159 |
Attenuation | p. 163 |
Example: Computing intrinsic attenuation | p. 164 |
t* and velocity dispersion | p. 165 |
The absorption band modelå | p. 168 |
The standard linear solidå | p. 171 |
Earth's attenuation | p. 173 |
Observing Q | p. 175 |
Non-linear attenuation | p. 176 |
Seismic attenuation and global politics | p. 177 |
Exercises | p. 177 |
Reflection seismology | p. 181 |
Zero-offset sections | p. 182 |
Common midpoint stacking | p. 184 |
Sources and deconvolution | p. 188 |
Migration | p. 191 |
Huygens' principle | p. 192 |
Diffraction hyperbolas | p. 193 |
Migration methods | p. 195 |
Velocity analysis | p. 197 |
Statics corrections | p. 198 |
Receiver functions | p. 199 |
Kirchhoff theoryå | p. 202 |
Kirchhoff applications | p. 208 |
How to write a Kirchhoff program | p. 210 |
Kirchhoff migration | p. 210 |
Exercises | p. 211 |
Surface waves and normal modes | p. 215 |
Love waves | p. 215 |
Solution for a single layer | p. 218 |
Rayleigh waves | p. 219 |
Dispersion | p. 224 |
Global surface waves | p. 226 |
Observing surface waves | p. 228 |
Normal modes | p. 231 |
Exercises | p. 238 |
Earthquakes and source theory | p. 241 |
Green's functions and the moment tensor | p. 241 |
Earthquake faults | p. 245 |
Non-double-couple sources | p. 248 |
Radiation patterns and beach balls | p. 251 |
Example: Plotting a focal mechanism | p. 259 |
Far-field pulse shapes | p. 260 |
Directivity | p. 262 |
Source spectra | p. 265 |
Empirical Green's functions | p. 267 |
Stress drop | p. 268 |
Self-similar earthquake scaling | p. 271 |
Radiated seismic energy | p. 273 |
Earthquake energy partitioning | p. 277 |
Earthquake magnitude | p. 280 |
The b value | p. 288 |
The intensity scale | p. 290 |
Finite slip modeling | p. 291 |
The heat flow paradox | p. 293 |
Exercises | p. 297 |
Earthquake prediction | p. 301 |
The earthquake cycle | p. 301 |
Earthquake triggering | p. 309 |
Searching for precursors | p. 314 |
Are earthquakes unpredictable? | p. 316 |
Exercises | p. 318 |
Instruments, noise, and anisotropy | p. 321 |
Instruments | p. 321 |
Modern seismographs | p. 327 |
Earth noise | p. 330 |
Anisotropyå | p. 332 |
Snell's law at an interface | p. 337 |
Weak anisotropy | p. 337 |
Shear-wave splitting | p. 339 |
Hexagonal anisotropy | p. 341 |
Mechanisms for anisotropy | p. 343 |
Earth's anisotropy | p. 344 |
Exercises | p. 346 |
The PREM model | p. 349 |
Math review | p. 353 |
Vector calculus | p. 353 |
Complex numbers | p. 358 |
The eikonal equation | p. 361 |
Fortran subroutines | p. 367 |
Time series and Fourier transforms | p. 371 |
Convolution | p. 371 |
Fourier transform | p. 373 |
Hilbert transform | p. 373 |
Bibliography | p. 377 |
Index | p. 391 |
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