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Seismic Phenomena Connected with Earthquakes and Explosions
Annual rept. 1 Nov 1969-31 Oct 1970
CALIFORNIA INST OF TECH PASADENA SEISMOLOGICAL LAB
Pagination or Media Count:
Considerable progress has been made in the detailed study of continental structure using a variety of approaches, some of which are new, and the results of theoretical progress in wave propagation theory. The author has regionalized continents into provinces having typical crust and mantle structure, as well as other distinctive geophysical and geologic properties, and has provided at least a preliminary description of these properties. More detailed investigations of the variation of properties within these provinces were also pursued. Use of this knowledge for prediction of the seismic field provided interpretations of the radiation field which led to the resolution of important source characteristics and physical parameters. The theory of inversion has been developed to the point of wide application and utility and besides its intrinsic importance in all areas of geophysics and science, its application to seismic source and structure studies provides a systematic means of determining physical parameters of importance in the discrimination of seismic events. Progress in asymptotic wave propagation theory promises to provide sensitive high-resolution techniques capable of determining details of earth structure, in particular velocity gradients in the crust and mantle, and details of the source spectrum.
APPROVED FOR PUBLIC RELEASE