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Crustal structure of the Andes from Rayleigh wave dispersion

Cisternas, Armando (1961) Crustal structure of the Andes from Rayleigh wave dispersion. Bulletin of the Seismological Society of America, 51 (3). pp. 381-388. ISSN 0037-1106.

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Records from a Benioff short-period seismograph located at Huancayo, Peru, are digitalized and then passed through a low-pass filter to get the long-period waves. In this way the dispersion curves of Rayleigh waves for paths along the Andes can be computed from seismograms which otherwise would be unusable. The comparison with the empirical curve for a “normal” continental crust (Press 1960) and with specially computed theoretical models indicates a crustal thickness of the order of 50 km. For periods between 20 and 25 sec., the observed group velocity shows abnormally low values.

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Additional Information:Copyright © 1961, by the Seismological Society of America. Manuscript received for publication January 3, 1961. The author wishes to thank Dr. Frank Press who suggested the problem and gave his advice throughout the work. He is also grateful to Mr. Saul Shragowitz who kindly wrote the program for the low-pass digital filter, to Mr. Shelton Alexander for his advice on several parts of the work, and to Mr. Stephane Dopp who helped in the first part of it. The author is a Fellow supported by the International Cooperation Administration. This research was partially supported by Contract No. AF-49 (638) 910 of the Air Force Technical Applications Center as part of the Advanced Research Projects Agency project VELA.
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International Cooperation AdministrationUNSPECIFIED
Air Force Office of Scientific Research (AFOSR)AF-49 (638) 910
Advanced Research Projects Agency (ARPA), project VelaUNSPECIFIED
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Caltech Division of Geological Sciences1010
Issue or Number:3
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:47801
Deposited By: George Porter
Deposited On:01 Aug 2014 20:16
Last Modified:03 Oct 2019 06:57

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