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Determination of source parameters of explosions and earthquakes by amplitude equalization of seismic surface waves: 1. Underground nuclear explosions

Toksöz, M. N. and Ben-Menahem, A. and Harkrider, D. G. (1964) Determination of source parameters of explosions and earthquakes by amplitude equalization of seismic surface waves: 1. Underground nuclear explosions. Journal of Geophysical Research, 69 (20). pp. 4355-4366. ISSN 0148-0227. https://resolver.caltech.edu/CaltechAUTHORS:20151021-150137211

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Abstract

A method of determining the source parameters of explosions and earthquakes from the amplitude spectrums of seismic surface waves is described. The method, called amplitude equalization, involves the correction of the ground displacement spectrum for the propagation effect. This is accomplished by multiplying it numerically with the inverse of the frequency response of the layered medium. The result is the amplitude spectrum of the source function, which may be interpreted by itself or jointly with the initial phase spectrum to determine the source-time variation. The spectrums of the Rayleigh waves from underground nuclear explosions are compared and the source-time function is interpreted using the amplitude equalization method. The time variation of the pressure pulse at the boundary of the elastic zone is found to be of the form p(t) = P_0te^(−ηt), where η is a parameter which depends on the yield of the explosion and on the medium. For the events studied, the breadth of the pulse increased (η decreased) with the yield of the explosion.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1029/JZ069i020p04355 DOIArticle
http://onlinelibrary.wiley.com/doi/10.1029/JZ069i020p04355/abstractPublisherArticle
Additional Information:© 1964 American Geophysical Union. Manuscript received May 25, 1964; revised July 6, 1964. This research was supported by contract AF-49(638)-1337 of the Air Force Office of Scientific Research as part of the Advanced Research Projects Agency project Vela. We wish to thank Dr. R. H. Bishop and the Sandia Corporation for permitting us to include two of their figures (Figures 6 and 7) in the paper.
Funders:
Funding AgencyGrant Number
Air Force Office of Scientific Research (AFOSR)AF-49(638)-1337
Advanced Research Projects Agency (ARPA), project VelaUNSPECIFIED
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Caltech Division of Geological Sciences1262
Issue or Number:20
Record Number:CaltechAUTHORS:20151021-150137211
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20151021-150137211
Official Citation:Toksöz, M. N., A. Ben-Menahem, and D. G. Harkrider (1964), Determination of source parameters of explosions and earthquakes by amplitude equalization of seismic surface waves: 1. Underground nuclear explosions, J. Geophys. Res., 69(20), 4355–4366, doi:10.1029/JZ069i020p04355
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:61400
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:21 Oct 2015 22:48
Last Modified:03 Oct 2019 09:07

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