Synthetic Seismogram Modeling.
Final technical rept. 1 Dec 80-28 Feb 82,
PURDUE UNIV LAFAYETTE IN DEPT OF GEOSCIENCES
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Seismic modeling techniques for one- and two-dimensional velocity models have been developed, tested and applied to analysis of observed seismic refraction and reflection data for the continental crust. The relfectivity method for one-dimensional models has proven to be an efficient and powerful method for interpretation of the amplitude and waveform of seismic record sections. The amplitude and waveform characteristics are shown to be important to interpretation of fine structure of velocity depth profiles. Applications to modeling of a variety of seismic phases are given. Two-dimensional modeling techniques utilizing ray-trace travel-time calculations and finite-difference synthetic seismogram calculations were developed. The ray-tracing methods are capable of accurate travel-time applications but require modification for amplitude analysis. The finite-difference method is a powerful technique capable of modeling seismic data for complex geologic structures for body and surface waves. Model studies for simple one- and two-dimensional velocity structures illustrate seismic wave propagation including complex amplitude and waveform characteristics due to model complexity. The principal limitation of the finite-difference technique is the large amount of computer time and storage required.