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AbstractAbstract
[en] This report describes the progress being made in event location using a single 3-component station. In this study locations are obtained using a backazimuth determined by the particle motion of Pn and a distance determined by differential travel times between Pn, Pg, and Lg relative to a master event of known location. The data set used consists of the seismic signals from 11 nuclear events at the Nevada Test Site (NTS) and recorded at the four Lawrence Livermore National Laboratory (LLNL) seismic stations: Elko, Kanab, Landers, and Mina. The stations range from 230 km to 400 km away from the events. The local magnitude (ML) of the events range from 3.7 to 5.6 with the small events barely visible over the microseisms. All calculations and observations are made after the events have been filtered between 0.3 and 6 Hz. The results of this analysis show that backazimuth can be determined to within +- 50 of the true backazimuth, about 90% of the time, after systematic variations are taken out
Primary Subject
Source
19 Nov 1982; 23 p; Available from NTIS, PC A02/MF A01 as DE83006668
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Report
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Habercom, G.E. Jr.
National Technical Information Service, Springfield, Va. (USA)1977
National Technical Information Service, Springfield, Va. (USA)1977
AbstractAbstract
[en] Methods of seismic detection of nuclear events are investigated in the Government sponsored research reports. Data acquisition techniques, data processing, and data collection sources are reviewed. The updated bibliography contains 246 abstracts, 101 of which are new entries to the previous edition. See also NTIS/PS-76/0208, Volume 2, 1973-1974 and NTIS/PS-76/0207, Volume 1, 1970-1972
Primary Subject
Source
Apr 1977; 251 p; Available from NTIS., PC N01/MF N01
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Report
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AbstractAbstract
[en] The site and intensity of nuclear weapons tests can be reliably determined by measurement and suitable interpretation of seismic waves. A seismic focus is up to 20 times larger than the destruction zone of a comparably strong explosion, so that a seismic event will last longer by one order of magnitude than an explosion. Nuclear weapons tests induce much more high-frequency vibrations than a seismic event, and a seismic event normally proceeds in a series of subsequent shocks. Diaphragms applied in the range 10 to 30 Hz considerably improve the signal-to-noise ratio of systems for the detection of nuclear weapons tests. (orig./DG)
[de]
Durch die Vermessung und richtige Interpretation seismischer Wellen lassen sich Ort und Staerke von Kernwaffenexplosionen zuverlaessig angeben. Ein Erdbebenherd ist bis zu 20 mal groesser als die Truemmerzone einer vergleichbar starken Explosion. Die Zeitdauer eines Erdbebens ist daher mindestens um eine Groessenordnung laenger als die einer Explosion. Bei Kernwaffentests werden somit mehr hochfrequente Schwingungskomponenten erzeugt als bei Erdbeben. Hinzu kommt, dass bei einem Erdbeben in der Regel mehrere 'Rucke' zeitlich nacheinander erfolgen. Durch Einsatz von Filtern im Bereich 10 bis 30 Hz laesst sich das Signal/Rausch-Verhaeltnis fuer die Detektion von Kernwaffentests wesentlich verbessern. (orig./DG)Original Title
Kernwaffentests weltweit durch Seismographie erfassbar
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Journal Article
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AbstractAbstract
[en] Since 1969, a consistent discrepancy in seismic magnitudes of nuclear detonations at NTS compared with magnitudes of detonations elsewhere in the world has been observed. This discrepancy can be explained in terms of a relatively high seismic attenuation for compressional waves in the upper mantle beneath the NTS and in certain other locations. A correction has been developed for this attenuation based on a relationship between the velocity of compressional waves at the top of the earth's mantle (just beneath the Mohorovicic discontinuity) and the seismic attenuation further down in the upper mantle. Our new definition of body-wave magnitude includes corrections for attenuation in the upper mantle at both ends of the teleseismic body-wave path. These corrections bring the NTS oservations into line with measurements of foreign events, and enable one to make more reliable estimates of yields of underground nuclear explosions, wherever the explosion occurs
Primary Subject
Source
California Univ., Livermore (USA). Lawrence Livermore Lab; p. 10-15; Mar 1978; p. 10-15
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Report
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Pruvost, N.L.
California Univ., Livermore (USA). Lawrence Livermore Lab1978
California Univ., Livermore (USA). Lawrence Livermore Lab1978
AbstractAbstract
[en] A 1976 treaty between the United States and the Soviet Union permits a local seismic network to be deployed at the site of a peaceful nuclear explosion to monitor the event. Criteria for the design and selection of the data-acquisition equipment for such a network are provided. Constraints imposed by the protocol of the treaty, the environment, and the expected properties of seismic signals (based on experiences at the Nevada Test Site) are discussed. Conclusions are drawn about the desired operating mode. Criteria for a general seismic instrumentation system are described
Original Title
On-site inspection against clandestine operations
Primary Subject
Source
23 Mar 1978; 31 p; Available from NTIS., PC A03/MF A01
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Report
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AbstractAbstract
No abstract available
Original Title
Patent
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Secondary Subject
Source
7 Jan 1975; 6 p; US PATENT DOCUMENT 3,859,519
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Patent
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AbstractAbstract
[en] The structure and characteristics of rugged photomultiplier tube are introduced. It can be used in adverse circumstances
Source
China Electronics Society, Beijing (China); Chinese Nuclear Society, Beijing (China); 172 p; 1999; p. 137-139; '98 National conference on nuclear instruments; Jiangyou, Sichuan (China); 16-23 Sep 1998; Available from China Nuclear Information Centre
Record Type
Miscellaneous
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Conference
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Thornbrough, A.D.
Sandia Labs., Albuquerque, N.Mex. (USA)1978
Sandia Labs., Albuquerque, N.Mex. (USA)1978
AbstractAbstract
[en] Sandia Laboratories is developing for the U.S. Army a Ground-Based Nuclear Burst Detection System to provide pertinent information for its field commanders and higher authorities. The equipment must operate in all kinds of weather and produce very low false alarms under all types of conditions. With these requirements, a study of the effects during thunderstorms, which includes thousands of lightning flashes, was conducted. The results of these studies were that, with suitable discrimination, the system had no false alarms during a period of high thunderstorm activity in the Albuquerque area for the time from September 13 to October 3, 1977. Data and plots are included of those false alarms that were recorded before the final discriminants were implemented to provide an inventory of waveshapes for additional analysis
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Source
Apr 1978; 88 p; Available from NTIS., PC A05/MF A01
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Report
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AbstractAbstract
[en] This paper analyses a existing problem of bistation bearing-only locating arithmetic on the engineering project. The arithmetic of solving problems are advanced and explained. (authors)
Primary Subject
Secondary Subject
Source
2 figs., 1 ref.
Record Type
Journal Article
Journal
Nuclear Electronics and Detection Technology; ISSN 0258-0934;
; v. 24(6); p. 598-600

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AbstractAbstract
No abstract available
Original Title
National programme of peaceful nuclear explosions
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Source
International Atomic Energy Agency, Vienna (Austria); Panel proceedings series; 198 p; ISBN 92-0-061078-1;
; 1978; p. 8; IAEA; Vienna; Technical committee on the peaceful uses of nuclear explosions; Vienna, Austria; 22 - 24 Nov 1976; IAEA-TC--81-5/14; Published in summary form only.

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Book
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Conference
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