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Determination of source parameters by amplitude equalization of seismic surface waves: 2. Release of tectonic strain by underground nuclear explosions and mechanisms of earthquakes

Toksöz, M. Nafi and Harkrider, David G. and Ben-Menahem, Ari (1965) Determination of source parameters by amplitude equalization of seismic surface waves: 2. Release of tectonic strain by underground nuclear explosions and mechanisms of earthquakes. Journal of Geophysical Research, 70 (4). pp. 907-922. ISSN 0148-0227. https://resolver.caltech.edu/CaltechAUTHORS:20150928-113442846

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Abstract

The radiation patterns of Love and Rayleigh waves from three nuclear explosions (Hardhat, Haymaker, and Shoal) are studied to determine the nature of the asymmetry of radiation and the mechanism of Love wave generation. From a comparative study of different explosions it is reasoned that the Love waves are generated at the source of the explosion. The source function, represented as the superimposition of an isotropic dilatational component due to the explosion and a multipolar component due to the release of tectonic strain energy, is consistent with the observed radiation patterns and the amplitude spectrums. The amount of seismic energy due to the strain release is computed. In some cases (Haymaker and Shoal) it is found that this energy may be due to the relaxation of the pre-stressed medium by the explosion-formed cavity. In the case of Hardhat it is concluded that the explosion must have triggered some other strain release mechanism, such as an earthquake. The amplitude equalization method is applied to surface waves from an earthquake to determine the source parameters. From only the amplitude spectrums and radiation patterns of Love and Rayleigh waves, the source functions, source depth, strike and dip of the fault plane, and the rake of displacement are determined for the July 20, 1964, Fallon earthquake.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1029/JZ070i004p00907DOIArticle
http://onlinelibrary.wiley.com/doi/10.1029/JZ070i004p00907/abstractPublisherArticle
Additional Information:© 1965 by the American Geophysical Union. Manuscript received September 18, 1964; revised November 11, 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.
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 Sciences1209
Issue or Number:4
Record Number:CaltechAUTHORS:20150928-113442846
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20150928-113442846
Official Citation:Toksöz, M. N., D. G. Harkrider, and A. Ben-Menahem (1965), Determination of source parameters by amplitude equalization of seismic surface waves: 2. Release of tectonic strain by underground nuclear explosions and mechanisms of earthquakes, J. Geophys. Res., 70(4), 907–922, doi:10.1029/JZ070i004p00907
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:60576
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:29 Sep 2015 02:49
Last Modified:03 Oct 2019 08:58

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