Seismic Tomography

Methods to eonstruet images of an objeet from "projeetions" of x-rays, ultrasound or eleetromagnetie waves have found wide applieations in eleetron mieroseopy, diagnostie medicine and radio astronomy. Projeetions are measurable quantities that are a funetiona- usually involving a line integral - of physieal properties of an objeet. Convolutional methods, or iterative algorithms to solve large systems of linear equations are used to reeonstruet the objeet. In prineiple, there is no reasan why similar image reeonstruetions ean not be made with seismie waves. In praetiee, seismic tomography meets with a number of diffieulties, and it is not until the last deeade that imaging of transmitted seismie waves has found applicatian in the Earth sciences. The most important differenee between global seismie tomography and mare eonventional applieations in the laboratory is the faet that the seismologist is eonfronted with the lack of anything resembling a well-eontrolled experimental set-up. Apart from a few nuelear tests, it is not in our power to locate or time seismie events. Apart from a few seabattom seismographs, our sensors are located on land -and even there the availability of data depends on eultural and politieal factors. Even in exploratian seismics, praetieal faetors such as the east of an experiment put strong limitations on the eompleteness of the data set.

Texte du rabat

Methods to eonstruet images of an objeet from "projeetions" of x-rays, ultrasound or eleetromagnetie waves have found wide applieations in eleetron mieroseopy, diagnostie medicine and radio astronomy. Projeetions are measurable quantities that are a funetiona- usually involving a line integral - of physieal properties of an objeet. Convolutional methods, or iterative algorithms to solve large systems of linear equations are used to reeonstruet the objeet. In prineiple, there is no reasan why similar image reeonstruetions ean not be made with seismie waves. In praetiee, seismic tomography meets with a number of diffieulties, and it is not until the last deeade that imaging of transmitted seismie waves has found applicatian in the Earth sciences. The most important differenee between global seismie tomography and mare eonventional applieations in the laboratory is the faet that the seismologist is eonfronted with the lack of anything resembling a well-eontrolled experimental set-up. Apart from a few nuelear tests, it is not in our power to locate or time seismie events. Apart from a few seabattom seismographs, our sensors are located on land -and even there the availability of data depends on eultural and politieal factors. Even in exploratian seismics, praetieal faetors such as the east of an experiment put strong limitations on the eompleteness of the data set.

Résumé
` .. the most significant book in seismology since Aki and Richards, and the most enjoyable geophysics book I have read since Munk and MacDonald.
Pageoph vol.127,No.4,1988

Contenu
List of Contents.- 1 Seismic wave propagation and seismic tomography.- I: Basic Theory.- 2 The Radon transform and seismic tomography.- 3 Numerical solution of large, sparse linear algebraic systems arising from tomographic problems.- 4 On the validity of the ray approximation for interpreting delay times.- 5 Ray tracing algorithms in three-dimensional laterally varying layered structures.- II: Applications in Seismic Exploration.- 6 Inversion of travel times and seismic waveforms.- 7 Crosshole transmission tomography.- 8 Tomography from seismic profiles.- 9 Seismic rock properties for reservoir descriptions and monitoring.- III: Applications in Global Seismology.- 10 Seismic data collection platforms for satellite transmission.- 11 The harmonic expansion approach to the retrieval of deep Earth structure.- 12 Ray tracing for surface waves.- 13 Waveform tomography.- 14 Surface wave holography.- 15 Tomographic imaging of seismic sources.- References.