Download or read book Measurements of Ultrasonic Wave Velocities in Ice Cores from Greenland and Antarctica written by Hugh Frederick Bennett and published by . This book was released on 1972 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt: Detailed ultrasonic velocity measurements were made on snow and ice cores from Greenland and Antarctica in order to study velocity anisotropy and its relationship to the petrofabric analysis of these cores. In addition, ultrasonic velocities were measured in the near-surface snow layers at Byrd Station and South Pole Station, Antarctica, to provide a detailed velocity profile in the region of the ice sheet where the velocity is greatly influenced by the snow structure. The experimental arrangement, including the design of equipment, measurement errors, techniques, and problems encountered in the study, is discussed. The theory of wave propagation in a general anisotropic medium is reviewed and a detailed presentation of this theory, concerning transversely isotropic media, is given. A method is developed for calculating a theoretical velocity model from the petrofabric analysis of the ice cores, thus providing a means of testing the theory with field and laboratory observations. (Author).
Download or read book Measurements of Ultrasonic Wave Velocities in Ice Cores from Greenland and Antarctica written by Charles R. Bentley and published by . This book was released on 1965 with total page 94 pages. Available in PDF, EPUB and Kindle. Book excerpt: The study to measure ultrasonic P and S wave velocities in the ice cores from Greenland and Antarctica was designed to overcome the limitations of the standard methods. The main object of the study was to determine whether the sonic velocity measurements were consistent with the petrofabrics of the ice cores and thereby establish a method of estimating gross crystal orientation by sonic means. In addition, it provided a means of checking the results determined by refraction seismic methods. The comparison of these results indicated the amount of anisotropy present. The determination of wave attenuation as a function of depth also gave a measure of the mechanical filtering properties of the upper layers in the ice sheet. (Author).
Download or read book An Investigation Into Velocity Anisotropy Through Measurements of Ultrasonic Wave Velocities in Snow and Ice Cores from Greenland and Antarctica written by Hugh Frederick Bennett and published by . This book was released on 1968 with total page 630 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ultrasonic Velocity Investigations of Crystal Anisotropy in Deep Ice Cores from Antarctica written by Heinz Kohnen and published by . This book was released on 1979 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Measurements of Ultrasonic Wave Velocities in Ice Cores written by Cold Regions Research and Engineering Laboratory (U.S.) and published by . This book was released on 1971 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ultrasonic Velocity Investigations of Crystal Anisotropy in Deep Ice Cores from Antarctica written by Heinz Kohnen and published by . This book was released on 1979 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ice cores from Byrd Station and Little America V have been used to test an ultrasonic technique for evaluating crystal anisotropy in the Antarctic Ice Sheet. P-wave velocities measured parallel and perpendicular to the vertical axes of cores from the 2164-m-thick ice sheet at Byrd Station have yielded results in excellent agreement with the observed c-axis fabric profile and with the in-situ P-wave velocity profile measured parallel to the bore hole axis. Velocity differences in excess of 140 m/s for core samples from deeper than 1300 m attest to the strong single pole clustering of crystallographic c-axes about the vertical, especially in the zone from 1300-1800 m. Such oriented structure is compatible only with strong horizontal shearing in this zone. The existence in an ice sheet of widespread shearing several hundred meters above its bed raises serious questions as to the validity of current concepts of the flow of large ice masses that tend to gloss over or ignore crystal alignments of this magnitude.
Download or read book Monthly Catalog of United States Government Publications written by and published by . This book was released on 1972 with total page 1932 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Research Report Corps of Engineers U S Army Cold Regions Research and Engineering Laboratory written by and published by . This book was released on 1967 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Selected Water Resources Abstracts written by and published by . This book was released on 1980 with total page 810 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book CRREL Technical Publications 1950 1975 written by Cold Regions Research and Engineering Laboratory (U.S.) and published by . This book was released on 1992 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Monthly Catalog of United States Government Publications Cumulative Index written by United States. Superintendent of Documents and published by . This book was released on 1976 with total page 1408 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Government wide Index to Federal Research Development Reports written by and published by . This book was released on 1967-05 with total page 1470 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Measurements of Electromagnetic Wave Velocity in the East Antarctic Ice Sheet written by John Wendell Clough and published by . This book was released on 1970 with total page 106 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book SIPRE Report written by and published by . This book was released on with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Technical Abstract Bulletin written by and published by . This book was released on with total page 828 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Selected Water Resources Abstracts written by and published by . This book was released on 1980 with total page 672 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Technical Report written by Cold Regions Research and Engineering Laboratory (U.S.) and published by . This book was released on 1979 with total page 610 pages. Available in PDF, EPUB and Kindle. Book excerpt:
