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2 results

  • 1 - Introduction

  • Brian L. N. Kennett, Australian National University, Canberra, Andreas Fichtner
  • Book:
    Exploiting Seismic Waveforms
    Published online:
    16 November 2020
    Print publication:
    03 December 2020, pp 1-10

  • Summary

    Current seismology depends on well-developed networks of instruments and a range of advances in both theoretical and computational developments. We provide a survey of the development of seismic recording, including the introduction of dense sets of portable instruments, so that major earthquakes are now captured by thousands of seismometers. We then discuss the way in which understanding of seismic waveforms has developed through the computation of synthetic seismograms and their exploitation in inversion. The last part of the chapter provides a description of the structure of the four Parts of the book

  • 7 - Synthetic Seismograms

  • Edward S. Krebes, University of Calgary
  • Book:
    Seismic Wave Theory
    Published online:
    15 March 2019
    Print publication:
    28 March 2019, pp 242-269

  • Summary

    This chapter covers the computation of synthetic seismograms, or theoretical seismograms. This involves predicting, via computation, what seismic traces might look like for a given subsurface medium model. The relatively simple case of vertically traveling waves in a sequence of flat horizontal layers is discussed in relative detail, including how to compute wave amplitude losses due to reflection, transmission, geometrical spreading of wavefronts, and absorption. The generally more complicated case of nonvertically traveling waves is also briefly summarized. More complete methods such as the finite difference and finite element methods are briefly mentioned. Also covered are the reflectivity function and the interference effects that occur for waves with nearly equal arrival times, such as the tuning effect. The chapter ends with an appendix showing examples of synthetic seismograms computed with the finite difference method.