Download or read book Surface Motions from an Underground Explosion written by and published by . This book was released on 1958 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt: Seismic effects of Rainier, a 1.7-kt nuclear shot detonated 900 feet underground, were measured in terms of ground surface motion at ten strong-motion seismograph stations located 1200 to 45,000 feet from the source. In addition, records were borrowed from seven teleseismic stations located 100 to 300 miles from the source. Recorded accelerations attenuated from a maximum singlecomponent value of 2.6 g at 1280 feet to 0.009 g at 17,640 feet. Gutenberg-Richter magnitude of Rainier, calculated as for a natural earthquake from seven WoodAnderson seismograph records, was 4.6. Earthquakes of 4.6 magnitude are felt up to 60 miles from the epicenter, however, Rainier was felt by only a few observers at 21/2 miles. Seismologists at established teleseismic stations were able to pick out Rainier's elastic wave signature on seismograms at considerable distance. Very small amplitude waves from Rainier were found on the Coast and Geodetic Survey, College, Alaska, seismogram, 3600 km away, although attempts in the eastern United States at distances of 2000 to 3000 km, using conventional instruments, were not successful.
Download or read book Surface Motions from an Underground Explosion written by Dean S. Carder and published by . This book was released on 1958 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A First Estimate of Initial Surface Motions Produced by an Underground Explosion written by H. A. Lang and published by . This book was released on 1960 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt: The method used is capable, in principle, of extension to more complex distributions of sources modeling explosions, faulting, and earthquakes. The term "primary seismogram" is introduced to imply that the displacement-time curve is free of uncertainties in source, instruments and propagational characteristics of the medium which are present in the wave records of any real seismic disturbance. The intent of the paper is to both illustrate the technique by an example and to emphasize additional problems and extensions for generating more complex primary seismograms.
Download or read book Surface Motions from Underground Explosions Appendix A Response Spectrum Analysis of Records from Events Blanca and Logan written by D. S. CARDER and published by . This book was released on 1961 with total page 83 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ground effects resulting from certain HARDTACK II underground explosions were measured by strong-motion and teleseismic seismographs from 2000 feet to distances of nearly 100 miles. In addition, many temporary seismographs were operated by a number of organizations to distances of nearly 2400 miles, and routine seismographs continued to operate on a world wide basis. Some of the results are given in this report. An energetic wave believed reflected from the surface near the source was recorded by some of the strong-motion seismographs. It is out of phase with the initial wave and follows it by about a quarter second. From the ground effects standpoint, the Blanca shot was equivalent to a magnitude 4.8 earthquake, and seismic energy contained in a wave 0.8 km. from the source is believed to contain about 0.4 percent of the yield energy. The Logan and Rainier shots were respectively equivalent to magnitude 4.5 and 4.1 earthquakes and corresponding seismic energies contained respectively 0.5 and 0.3 percent of the yield energy.
Download or read book Operation HARDTACK written by and published by . This book was released on 1961 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Geometric Technique for Studying Surface Motions from Underground Nuclear Explosions in Real Geologic Layered Media written by Henry F Cooper (Jr) and published by . This book was released on 1967 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt: A Semiempirical technique, utilizing the methods of geometrical optics, is used to examine the effect of geologic layering on the surface peak particle velocity associated with the direct compressional wave produced by underground nuclear explosions. This geometric technique is different from former 'ray' techniques in that it accounts for the curvature of the wave front, i.e., the divergence of the rays, as well as the distance the wave travels. Data from contained nuclear explosions in 'homogeneous' media are used to determine the relationship between the peak particle velocity and the divergence of the rays. This empirical relationship is then used for layered media, where the divergence of the rays is determined by the methods of geometrical optics, to predict the free-surface peak particle velocity. The required transmission and reflection factors are currently taken from the theory of elastic wave propagation. Several parametric studies and comparisons with data from experiments in layered media are presented. It is found that a number of previously unexplained departures from what was measured and what might intuitively be expected are qualitatively and sometimes quantitatively predicted by this technique. It is emphasized that layering between the source and the free surface (which usually occurs) can have a profound and deceiving effect on the surface motion, and, therefore, it should not be neglected in any prediction technique. (Author).
Download or read book Above surface Earth Motion from Underground Explosions written by Leo F. Ingram and published by . This book was released on 1983 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Surface Motion from an Underground Detonation written by L. M. Swift and published by . This book was released on 1959 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt: Although predicted strains were higher than those observed, horizontal surface strain results support the conclusion that the principal disturbance on the mesa was confined to a relatively small radius (less than 500 feet) around surface zero. Peak strains measured on the slope are significantly larger than expected at comparable ranges on the mesa.
Download or read book Surface Motion Near Underground Nuclear Explosions in Desert Alluvium Operation Nougat I Area 3 Nevada Test Site written by William R. Perret and published by . This book was released on 1978 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Surface Motions from Underground Explosiongs with Appendix A Response Spectrum Analysis of Records from Events written by D. S. Carder and published by . This book was released on 1961 with total page 74 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Operation Hardtack written by Dean S. Carder and published by . This book was released on 1961 with total page 74 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Extreme Ground Motion Recorded in the Near Source Region of Underground Nuclear Explosions written by and published by . This book was released on 2005 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: Free-field recordings of underground nuclear explosions constitute a unique data set within the near-source region of seismic events ranging in magnitude from M3 to M6.5. The term ''free-field'' in this context refers to recordings from instruments emplaced in boreholes or tunnel walls such that the initial portions of the records ((almost equal to)0.1 to 1 second) do not contain effects resulting from reflections at the free surface. In addition to the free-field instruments deployed to record ground motions from selected underground nuclear explosions at the Nevada Test Site (NTS) and elsewhere, surface arrays were routinely deployed to record surface accelerations and velocities from underground nuclear tests conducted at NTS.
Download or read book Analysis of Component Surface downhole Ground Motions at Yucca Mountain for Underground Nuclear Explosions in Pahute Mesa written by James S. Phillips and published by . This book was released on 1991 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Subsurface Motion from a Confined Underground Detonation written by William R. Perret and published by . This book was released on 1958 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Summary of Ground Motion Prediction Results for Nevada Test Site Underground Nuclear Explosions Related to the Yucca Mountain Project written by and published by . This book was released on 1996 with total page 99 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report summarizes available data on ground motions from underground nuclear explosions recorded on and near the Nevada Test Site, with emphasis on the ground motions recorded at stations on Yucca Mountain, the site of a potential high-level radioactive waste repository. Sandia National Laboratories, through the Weapons Test Seismic Investigations project, collected and analyzed ground motion data from NTS explosions over a 14-year period, from 1977 through 1990. By combining these data with available data from earlier, larger explosions, prediction equations for several ground motion parameters have been developed for the Test Site area for underground nuclear explosion sources. Also presented are available analyses of the relationship between surface and downhole motions and spectra and relevant crustal velocity structure information for Yucca Mountain derived from the explosion data. The data and associated analyses demonstrate that ground motions at Yucca Mountain from nuclear tests have been at levels lower than would be expected from moderate to large earthquakes in the region; thus nuclear explosions, while located relatively close, would not control seismic design criteria for the potential repository.
Download or read book Subsurface Motion from a Confined Underground Detonation written by William R. Perret and published by . This book was released on 1961 with total page 78 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Summary Report of Strong Motion Measurements Underground Nuclear Detonations written by William Mansfield Adams and published by . This book was released on 1960 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt:
