Observations on seismic waves reflected at the core boundary of the earth

Creators: Martner, Samuel T.

Abstract

Waves reflected from the outer boundary of the core of the earth often record trace amplitudes that appear excessive. A comparison of the observed displacements of these phases and the direct body waves is presented. Observational data seem to confirm the idea that the displacement ratios of the longitudinal waves reflected at the core to the longitudinal direct waves is larger than the presently recognized theory indicates. A discussion is included of some possible causes for this difference, but reasonable changes in accepted assumptions fail to explain the entire discrepancy.

Additional Information

Copyright © 1950, by the Seismological Society of America. Condensed from a thesis submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy at the California Institute of Technology, Pasadena, California. Manuscript received for publication May 10, 1949. The author wishes to express his gratitude for the supervision, help, and inspiration of Dr. Beno Gutenberg, who contributed much to the completion of this study. The writer is also grateful for the cooperation of Dr. Hugo Benioff in overcoming some of the instrumental problems. Mr. Francis Lehner supplied helpful assistance while instrumental constants were determined. The final draft was reviewed by Professors Gutenberg, Benioff, and Richter, and their constructive criticism was appreciated. This work was completed while the writer held a fellowship provided by the Stanolind Oil and Gas Company, whose financial assistance is gratefully acknowledged.

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