A Caltech Library Service

Observations on the recorded ground motion due to P, PcP, S, and ScS

Ergin, Kazim (1952) Observations on the recorded ground motion due to P, PcP, S, and ScS. Bulletin of the Seismological Society of America, 42 (3). pp. 263-270. ISSN 0037-1106.

PDF - Published Version
See Usage Policy.


Use this Persistent URL to link to this item:


The recorded motion of a point at the surface of the earth, in the vertical plane of propagation, upon the arrival of PcP and ScS, as well as of the direct P and S waves, is reproduced from the seismograms of the vertical, N-S and E-W component, long-period Benioff seismographs. It is found that P and PcP produce a back-and-forth vibration in the general direction of the incoming ray, and that S and ScS produce a motion the largest displacement of which is approximately perpendicular to the ray. PcP motion starts close to the vertical, but its horizontal component later increases. A minor S phase arriving close to and after PcP and a minor P phase arriving close to and before ScS are observed. The effect of these minor phases on the smaller component of the ground vibration caused by the waves reflected from the mantle-core boundary is discussed.

Item Type:Article
Related URLs:
URLURL TypeDescription
Additional Information:Copyright © 1952, by the Seismological Society of America. Manuscript received for publication September 27, 1950; withheld temporarily from publication at request of author. The author is indebted to Professor Beno Gutenberg for recommending the problem and for his constructive criticism, and also to Professors C. F. Richter and H. Benioff, who reviewed the final draft and made valuable suggestions.
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Caltech Division of Geological Sciences558
Issue or Number:3
Record Number:CaltechAUTHORS:20140806-124653097
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:48099
Deposited By: George Porter
Deposited On:06 Aug 2014 21:03
Last Modified:03 Oct 2019 07:00

Repository Staff Only: item control page