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Bulletin of the Seismological Society of America; January 1936; v. 26; no. 1; p. 1-11
© 1936 Seismological Society of America
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Velocity of P waves in the earth calculated from the Macelwane P curve, 1933*

CORNELIUS G. DAHM

ST. LOUIS UNIVERSITY

Abstract

The Macelwane P curve is based on the data of the Tango, Hawke Bay, and Long Beach earthquakes, all of 10–12 km. focal depth. This curve was modified and adjusted to fit a spheroid of 6355 km. radius, the outer part of which has the same properties as those immediately under the Mohorovicic discontinuity in Japan. The original and the adjusted P curve are given as well as the velocity-depth and depth-distance data obtained by applying the Herglotz-Wiechert method to the adjusted P curve. The inversion and slight decrease of the velocity-depth function at 2730 km. depth are discussed and the continued validity of the Herglotz-Wiechert method under those circumstances is shown.

Footnotes

* Manuscript received September 4, 1935.




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