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Initial motion of the first longitudinal earthquake wave recorded at Pasadena and Huancayo

Båth, Markus (1952) Initial motion of the first longitudinal earthquake wave recorded at Pasadena and Huancayo. Bulletin of the Seismological Society of America, 42 (2). pp. 175-195. ISSN 0037-1106.

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The initial motion of the first longitudinal earthquake waves (P waves) recorded at a station is (1) upward or away from the epicenter (compression = c) or (2) downward or toward the epicenter (dilatation = d). The P waves do not change their phase during their propagation through the earth, and the first motion, obtained from seismograms, depends only on the earthquake mechanism. The directions of later waves (such as pP, P_cP, PP, etc.) depend both on the earthquake mechanism and the possible phase changes on reflections; also, their directions are generally more difficult to determine from seismic records, owing to the motion already existing when they arrive. When the earthquake mechanism has been established by means of the P waves, the direction of motion of the later waves could give some information about the earth's interior.

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Additional Information:Copyright © 1952, by the Seismological Society of America. Manuscript received for publication February 19, 1951. This investigation has been carried out at the Seismological Laboratory, Pasadena, during my stay there as a Visiting Research Fellow of the California Institute of Technology. This was made possible thanks to a Fellowship from the Sweden- America Foundation, Stockholm. I wish to express my most sincere thanks to Professors B. Gutenberg, H. Benioff, and C. F. Richter for discussions and suggestions in this work; also to thank Mr. J. M. Nordquist of the Seismological Laboratory, who has drawn all the figures and has made suggestions regarding the wording of the text.
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Sweden-America FoundationUNSPECIFIED
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Caltech Division of Geological Sciences569
Issue or Number:2
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:48083
Deposited By: George Porter
Deposited On:06 Aug 2014 20:33
Last Modified:03 Oct 2019 07:00

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