Abstract

Theoretical problems concerned with the calculation of the velocities of seismic waves in the various layers of the earth's crust, and the determination of the thickness of such layers, are discussed. The results are applied to seismograms obtained from artificial explosions, and sources of error in interpretation are investigated. Seismograms registered in different parts of the earth from epicenters less than 1000 km from stations are used to investigate the layering in these regions and the problem of mountain roots. The bearing of the findings on the theory of isostasy is discussed.

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